| Rank | Population Density ▼ | School District / Population |
| 1. | 18,797.2/sq mi | Hawthorne Elementary School District / 73,786 |
| 2. | 17,274.0/sq mi | Lennox Elementary School District / 28,409 |
| 3. | 16,744.1/sq mi | Luther Burbank Elementary School District / 4,306 |
| 4. | 14,688.7/sq mi | Lynwood Unified School District / 69,538 |
| 5. | 13,296.4/sq mi | Lawndale Elementary School District / 48,987 |
| 6. | 13,124.4/sq mi | Savanna Elementary School District / 30,611 |
| 7. | 12,544.8/sq mi | Centinela Valley Union High School District / 164,477 |
| 8. | 12,281.4/sq mi | Magnolia Elementary School District / 63,683 |
| 9. | 11,901.8/sq mi | Mountain View Elementary School District / 57,223 |
| 10. | 11,768.7/sq mi | Bellflower Unified School District / 83,462 |
| 11. | 11,688.9/sq mi | Paramount Unified School District / 79,104 |
| 12. | 11,251.1/sq mi | Alhambra Unified (9-12) School District / 51,203 |
| 12. | 11,251.1/sq mi | Garvey Elementary School District / 51,203 |
| 14. | 11,163.4/sq mi | Inglewood Unified School District / 114,173 |
| 15. | 9,991.9/sq mi | Alhambra Unified School District / 117,800 |
| 16. | 9,894.9/sq mi | Temple City Unified School District / 36,238 |
| 17. | 9,746.1/sq mi | Santa Ana Unified School District / 259,835 |
| 18. | 9,724.2/sq mi | Garden Grove Unified School District / 280,562 |
| 19. | 9,662.6/sq mi | Anaheim Union High School District / 393,069 |
| 20. | 9,402.6/sq mi | Centralia Elementary School District / 55,222 |
| 21. | 9,387.1/sq mi | Anaheim Elementary School District / 199,329 |
| 22. | 9,074.8/sq mi | San Gabriel Unified School District / 41,687 |
| 23. | 9,042.5/sq mi | Rosemead Elementary School District / 28,045 |
| 24. | 8,852.8/sq mi | Moreland Elementary School District / 49,281 |
| 25. | 8,835.7/sq mi | Downey Unified School District / 121,885 |
| 26. | 8,718.6/sq mi | Compton Unified School District / 156,928 |
| 27. | 8,635.9/sq mi | Baldwin Park Unified School District / 75,705 |
| 28. | 8,527.5/sq mi | Westminster Elementary School District / 86,034 |
| 29. | 8,385.6/sq mi | Franklin-McKinley Elementary School District / 90,120 |
| 30. | 8,036.7/sq mi | Norwalk-La Mirada Unified School District / 125,814 |
| 31. | 7,985.3/sq mi | La Habra City Elementary School District / 51,618 |
| 32. | 7,834.0/sq mi | El Monte Union High School District / 176,553 |
| 33. | 7,714.5/sq mi | El Rancho Unified School District / 61,415 |
| 34. | 7,676.0/sq mi | Montebello Unified School District / 166,945 |
| 35. | 7,579.7/sq mi | Campbell Union Elementary School District / 98,544 |
| 36. | 7,568.1/sq mi | South Pasadena Unified School District / 25,914 |
| 37. | 7,481.7/sq mi | El Monte City Elementary School District / 84,753 |
| 38. | 7,471.7/sq mi | Campbell Union High School District / 226,780 |
| 39. | 7,448.9/sq mi | Roseland Elementary School District / 12,127 |
| 40. | 7,399.1/sq mi | Bassett Unified School District / 26,107 |
| 41. | 7,304.6/sq mi | Cypress Elementary School District / 44,224 |
| 42. | 7,230.9/sq mi | Cambrian Elementary School District / 30,026 |
| 43. | 7,072.4/sq mi | South Whittier Elementary School District / 28,863 |
| 44. | 7,055.7/sq mi | Ontario-Montclair Elementary School District / 171,174 |
| 45. | 7,023.5/sq mi | ABC Unified School District / 106,746 |
| 46. | 6,999.0/sq mi | West Covina Unified School District / 60,683 |
| 47. | 6,961.1/sq mi | Fountain Valley Elementary School District / 53,593 |
| 48. | 6,921.3/sq mi | Ocean View Elementary School District / 94,443 |
| 49. | 6,888.6/sq mi | Buena Park Elementary School District / 49,447 |
| 50. | 6,729.6/sq mi | Central Elementary School District / 37,990 |
| 51. | 6,532.0/sq mi | Berkeley Unified School District / 115,570 |
| 52. | 6,531.4/sq mi | Piedmont City Unified School District / 10,957 |
| 53. | 6,517.4/sq mi | Culver City Unified School District / 39,615 |
| 54. | 6,486.1/sq mi | Sunnyvale Elementary School District / 89,108 |
| 55. | 6,476.4/sq mi | Lemon Grove Elementary School District / 34,849 |
| 56. | 6,348.2/sq mi | Little Lake City Elementary School District / 34,267 |
| 57. | 6,324.4/sq mi | National Elementary School District / 58,053 |
| 58. | 6,322.2/sq mi | Charter Oak Unified School District / 36,949 |
| 59. | 6,052.7/sq mi | Berryessa Union Elementary School District / 83,552 |
| 60. | 6,051.0/sq mi | Union Elementary School District / 44,623 |
| 61. | 6,015.7/sq mi | Burbank Unified School District / 104,484 |
| 62. | 5,983.6/sq mi | Torrance Unified School District / 146,841 |
| 63. | 5,945.1/sq mi | East Whittier City Elementary School District / 75,144 |
| 64. | 5,902.7/sq mi | Fullerton Elementary School District / 118,973 |
| 65. | 5,886.9/sq mi | Fullerton Joint Union High School District / 254,929 |
| 66. | 5,772.0/sq mi | Glendale Unified School District / 217,882 |
| 67. | 5,771.4/sq mi | Beverly Hills Unified School District / 34,601 |
| 68. | 5,749.8/sq mi | Tustin Unified School District / 137,595 |
| 69. | 5,713.1/sq mi | Salinas City Elementary School District / 78,278 |
| 70. | 5,608.8/sq mi | Hacienda La Puente Unified School District / 119,479 |
| 71. | 5,526.9/sq mi | Whittier Union High School District / 223,988 |
| 72. | 5,470.3/sq mi | Covina-Valley Unified School District / 79,918 |
| 73. | 5,423.3/sq mi | Pomona Unified School District / 170,167 |
| 74. | 5,308.3/sq mi | San Jose Unified School District / 263,681 |
| 75. | 5,221.6/sq mi | Emery Unified School District / 10,497 |
| 76. | 5,149.7/sq mi | Oakland Unified School District / 402,482 |
| 77. | 5,106.6/sq mi | La Mesa-Spring Valley School District / 134,920 |
| 78. | 5,066.0/sq mi | Fresno Unified School District / 389,017 |
| 79. | 5,038.7/sq mi | Oak Grove Elementary School District / 108,014 |
| 80. | 4,971.6/sq mi | San Leandro Unified School District / 69,203 |
| 81. | 4,933.4/sq mi | Santa Rosa Elementary School District / 71,625 |
| 82. | 4,826.4/sq mi | South Bay Union Elementary School District / 80,472 |
| 83. | 4,817.2/sq mi | Redondo Beach Unified School District / 67,511 |
| 84. | 4,810.4/sq mi | Los Angeles Unified School District / 4,616,744 |
| 85. | 4,768.2/sq mi | Sacramento City Unified School District / 328,696 |
| 86. | 4,761.5/sq mi | San Lorenzo Unified School District / 79,982 |
| 87. | 4,714.6/sq mi | San Carlos Elementary School District / 27,219 |
| 88. | 4,706.4/sq mi | Los Nietos Elementary School District / 16,470 |
| 89. | 4,644.5/sq mi | Whittier City Elementary School District / 69,244 |
| 90. | 4,593.8/sq mi | Arcadia Unified School District / 58,214 |
| 91. | 4,550.3/sq mi | Burlingame Elementary School District / 31,075 |
| 92. | 4,546.2/sq mi | Rowland Unified School District / 112,198 |
| 93. | 4,259.3/sq mi | Fontana Unified School District / 180,724 |
| 94. | 4,250.8/sq mi | San Juan Unified School District / 327,851 |
| 95. | 4,248.3/sq mi | Hayward Unified School District / 171,972 |
| 96. | 4,224.7/sq mi | Menlo Park City Elementary School District / 27,036 |
| 97. | 4,159.8/sq mi | Jefferson Elementary School District / 89,287 |
| 98. | 4,157.0/sq mi | Placentia-Yorba Linda Unified School District / 162,650 |
| 99. | 4,145.0/sq mi | Fremont Union High School District / 232,582 |
| 100. | 3,993.2/sq mi | Lincoln Unified School District / 47,549 |
| 101. | 3,924.1/sq mi | East Side Union High School District / 537,493 |
| 102. | 3,915.6/sq mi | Modesto City Elementary School District / 114,588 |
| 103. | 3,840.4/sq mi | Vista Unified School District / 148,293 |
| 104. | 3,783.2/sq mi | Dry Creek Joint Elementary School District / 53,224 |
| 105. | 3,772.6/sq mi | Huntington Beach Union High School District / 319,151 |
| 106. | 3,742.1/sq mi | Mount Pleasant Elementary School District / 22,947 |
| 107. | 3,736.7/sq mi | Wright Elementary School District / 19,794 |
| 108. | 3,711.6/sq mi | El Centro Elementary School District / 38,850 |
| 109. | 3,688.1/sq mi | Santa Clara Unified School District / 148,885 |
| 110. | 3,670.3/sq mi | Lowell Joint Elementary School District / 34,891 |
| 111. | 3,653.5/sq mi | San Marino Unified School District / 15,245 |
| 112. | 3,577.6/sq mi | Cotati-Rohnert Park Unified School District / 52,058 |
| 113. | 3,575.3/sq mi | San Francisco Unified School District / 829,072 |
| 114. | 3,569.4/sq mi | Twin Rivers Unified School District / 159,155 |
| 115. | 3,562.2/sq mi | Walnut Creek Elementary School District / 49,385 |
| 116. | 3,524.3/sq mi | Alvord Unified School District / 111,564 |
| 117. | 3,524.0/sq mi | Sylvan Union Elementary School District / 73,983 |
| 118. | 3,485.2/sq mi | Stockton Unified School District / 200,825 |
| 119. | 3,479.4/sq mi | Albany City Unified School District / 19,020 |
| 120. | 3,478.0/sq mi | Evergreen Elementary School District / 103,353 |
| 121. | 3,470.5/sq mi | Pacific Grove Unified School District / 18,360 |
| 122. | 3,468.5/sq mi | Hanford Elementary School District / 44,944 |
| 123. | 3,461.2/sq mi | Dublin Unified School District / 47,748 |
| 124. | 3,447.1/sq mi | Wiseburn Elementary School District / 13,295 |
| 125. | 3,446.6/sq mi | Irvine Unified School District / 202,069 |
| 126. | 3,443.1/sq mi | Monrovia Unified School District / 44,311 |
| 127. | 3,422.8/sq mi | Manhattan Beach Unified School District / 35,534 |
| 128. | 3,385.9/sq mi | Cupertino Union Elementary School District / 143,474 |
| 129. | 3,325.6/sq mi | Hermosa Beach City Elementary School District / 19,725 |
| 130. | 3,312.1/sq mi | Alameda City Unified School District / 75,763 |
| 131. | 3,305.4/sq mi | Mountain View Whisman Elementary School District / 67,269 |
| 132. | 3,149.6/sq mi | Orchard Elementary School District / 18,109 |
| 133. | 3,135.6/sq mi | Rocklin Unified School District / 58,954 |
| 134. | 3,131.9/sq mi | San Mateo-Foster City Elementary School District / 133,264 |
| 135. | 3,124.2/sq mi | Newark Unified School District / 43,635 |
| 136. | 3,075.3/sq mi | South San Francisco Unified School District / 80,631 |
| 137. | 2,994.6/sq mi | Sweetwater Union High School District / 475,328 |
| 138. | 2,932.0/sq mi | Oxnard Elementary School District / 127,565 |
| 139. | 2,929.8/sq mi | San Diego City Unified School District / 1,038,456 |
| 140. | 2,916.2/sq mi | Palo Alto Unified School District / 81,964 |
| 141. | 2,816.9/sq mi | Chula Vista Elementary School District / 292,557 |
| 142. | 2,810.8/sq mi | San Marcos Unified School District / 119,125 |
| 143. | 2,804.2/sq mi | Upland Unified School District / 74,363 |
| 144. | 2,775.8/sq mi | Pasadena Unified School District / 205,980 |
| 145. | 2,727.6/sq mi | Enterprise Elementary School District / 32,683 |
| 146. | 2,725.8/sq mi | Riverside Unified School District / 250,974 |
| 147. | 2,724.0/sq mi | Newport-Mesa Unified School District / 198,500 |
| 148. | 2,672.8/sq mi | Mountain View-Los Altos Union School District / 109,580 |
| 149. | 2,642.7/sq mi | Redwood City Elementary School District / 97,537 |
| 150. | 2,630.2/sq mi | Antioch Unified School District / 110,845 |
| 151. | 2,614.2/sq mi | Los Alamitos Unified School District / 50,324 |
| 152. | 2,606.8/sq mi | Walnut Valley Unified School District / 56,754 |
| 153. | 2,542.9/sq mi | Burton Elementary School District / 16,899 |
| 154. | 2,532.5/sq mi | Fremont Unified School District / 221,654 |
| 155. | 2,525.8/sq mi | Cajon Valley Union Elementary School District / 166,823 |
| 156. | 2,509.5/sq mi | Colton Joint Unified School District / 117,644 |
| 157. | 2,497.7/sq mi | Chaffey Joint Union High School District / 407,913 |
| 158. | 2,467.3/sq mi | Ravenswood City Elementary School District / 35,240 |
| 159. | 2,450.3/sq mi | Rialto Unified School District / 124,641 |
| 160. | 2,439.7/sq mi | Rio Elementary School District / 38,431 |
| 161. | 2,425.5/sq mi | Victor Elementary School District / 96,508 |
| 162. | 2,302.0/sq mi | New Haven Unified School District / 76,111 |
| 163. | 2,290.7/sq mi | Jurupa Unified School District / 97,621 |
| 164. | 2,277.7/sq mi | West Contra Costa Unified School District / 241,831 |
| 165. | 2,270.8/sq mi | Moreno Valley Unified School District / 171,643 |
| 166. | 2,268.3/sq mi | Greenfield Union Elementary School District / 51,494 |
| 167. | 2,255.7/sq mi | Alum Rock Union Elementary School District / 111,398 |
| 168. | 2,242.7/sq mi | Roseville Joint Union High School District / 169,832 |
| 169. | 2,233.9/sq mi | Santee Elementary School District / 58,990 |
| 170. | 2,169.1/sq mi | Etiwanda Elementary School District / 92,600 |
| 171. | 2,156.0/sq mi | Saddleback Valley Unified School District / 208,325 |
| 172. | 2,139.2/sq mi | Escondido Union Elementary School District / 165,464 |
| 173. | 2,116.0/sq mi | San Mateo Union High School District / 232,274 |
| 174. | 2,092.6/sq mi | Chino Valley Unified School District / 177,117 |
| 175. | 2,092.2/sq mi | Roseville City Elementary School District / 89,049 |
| 176. | 2,069.3/sq mi | Turlock Unified School District / 71,507 |
| 177. | 2,049.2/sq mi | Los Altos Elementary School District / 42,311 |
| 178. | 2,041.0/sq mi | Twin Rivers Unified School District in Robla / 20,703 |
| 178. | 2,041.0/sq mi | Robla Elementary School District / 20,703 |
| 180. | 2,040.4/sq mi | Belmont-Redwood Shores Elementary School District / 41,943 |
| 181. | 2,038.7/sq mi | Alta Loma Elementary School District / 56,136 |
| 182. | 2,032.6/sq mi | Santa Maria-Bonita Elementary School District / 99,819 |
| 183. | 2,028.6/sq mi | Sequoia Union High School District / 250,341 |
| 184. | 2,006.8/sq mi | Hueneme Elementary School District / 55,490 |
| 185. | 1,992.7/sq mi | Mount Diablo Unified School District / 258,884 |
| 186. | 1,990.7/sq mi | Encinitas Union Elementary School District / 71,440 |
| 187. | 1,979.8/sq mi | Valle Lindo Elementary School District / 6,532 |
| 188. | 1,973.4/sq mi | Fruitvale Elementary School District / 20,456 |
| 189. | 1,946.1/sq mi | Poway Unified School District / 195,170 |
| 190. | 1,940.6/sq mi | Farmersville Unified School District / 11,313 |
| 191. | 1,936.8/sq mi | El Segundo Unified School District / 16,839 |
| 192. | 1,934.6/sq mi | Natomas Unified School District / 73,273 |
| 193. | 1,933.9/sq mi | Pittsburg Unified School District / 57,097 |
| 194. | 1,892.3/sq mi | Ross Valley Elementary School District / 23,973 |
| 195. | 1,856.5/sq mi | Pleasanton Unified School District / 73,602 |
| 196. | 1,839.1/sq mi | Palmdale Elementary School District / 134,570 |
| 197. | 1,832.0/sq mi | Coronado Unified School District / 25,123 |
| 198. | 1,818.3/sq mi | Corona-Norco Unified School District / 266,438 |
| 199. | 1,814.0/sq mi | Vallejo City Unified School District / 120,853 |
| 200. | 1,813.4/sq mi | Santa Barbara Elementary School District / 83,498 |
| 201. | 1,794.2/sq mi | Stanislaus Union Elementary School District / 30,330 |
| 202. | 1,789.6/sq mi | Hillsborough City Elementary School District / 11,148 |
| 203. | 1,765.3/sq mi | San Bruno Park Elementary School District / 37,134 |
| 204. | 1,759.2/sq mi | Capistrano Unified School District / 353,831 |
| 205. | 1,747.3/sq mi | Washington Unified School District / 49,946 |
| 206. | 1,736.9/sq mi | Rosedale Union Elementary School District / 43,174 |
| 207. | 1,735.1/sq mi | San Rafael City Elementary School District / 55,283 |
| 208. | 1,727.1/sq mi | Brea-Olinda Unified School District / 35,795 |
| 209. | 1,711.4/sq mi | Soquel Elementary School District / 27,623 |
| 209. | 1,711.4/sq mi | Santa Cruz City High School District (9-12) in Soquel / 27,623 |
| 211. | 1,701.9/sq mi | Glendora Unified School District / 37,616 |
| 212. | 1,687.3/sq mi | Jefferson Union High School District / 147,284 |
| 213. | 1,680.9/sq mi | Conejo Valley Unified School District / 136,471 |
| 214. | 1,661.5/sq mi | Norris Elementary School District / 25,386 |
| 215. | 1,644.2/sq mi | Del Mar Union Elementary School District / 43,248 |
| 216. | 1,632.4/sq mi | Modesto City High School District / 270,816 |
| 217. | 1,622.1/sq mi | West Fresno Elementary School District / 7,102 |
| 218. | 1,603.9/sq mi | Bonita Unified School District / 62,559 |
| 219. | 1,600.4/sq mi | Huntington Beach City Elementary School District / 85,081 |
| 220. | 1,589.2/sq mi | Escondido Union High School District / 169,107 |
| 221. | 1,574.8/sq mi | San Bernardino City Unified School District / 257,587 |
| 222. | 1,554.1/sq mi | Eureka City Unified School District / 34,993 |
| 223. | 1,536.4/sq mi | Mountain View Elementary School District / 20,964 |
| 224. | 1,535.2/sq mi | Pleasant Valley Elementary School District / 74,799 |
| 225. | 1,533.6/sq mi | Orange Unified School District / 221,154 |
| 226. | 1,524.8/sq mi | San Ysidro Elementary School District / 44,246 |
| 227. | 1,516.6/sq mi | Carlsbad Unified School District / 73,826 |
| 228. | 1,482.7/sq mi | Val Verde Unified School District / 87,285 |
| 229. | 1,472.0/sq mi | Larkspur Elementary School District / 14,173 |
| 230. | 1,465.2/sq mi | Oceanside Unified School District / 139,735 |
| 231. | 1,455.7/sq mi | Lafayette Elementary School District / 27,745 |
| 232. | 1,449.8/sq mi | Simi Valley Unified School District / 129,256 |
| 233. | 1,446.6/sq mi | Fairfax Elementary School District / 15,158 |
| 234. | 1,443.2/sq mi | Eureka Union Elementary School District / 27,559 |
| 235. | 1,442.6/sq mi | Winton Elementary School District / 11,981 |
| 236. | 1,427.0/sq mi | Menifee Union Elementary School District / 83,734 |
| 237. | 1,417.0/sq mi | Las Lomitas Elementary School District / 11,410 |
| 238. | 1,406.2/sq mi | San Dieguito Union High School District / 172,297 |
| 239. | 1,397.5/sq mi | Monterey Peninsula Unified School District / 90,626 |
| 240. | 1,389.3/sq mi | Acalanes Union High School District / 112,398 |
| 241. | 1,381.2/sq mi | Cucamonga Elementary School District / 28,773 |
| 242. | 1,366.5/sq mi | San Ramon Valley Unified School District / 146,042 |
| 243. | 1,364.3/sq mi | Folsom-Cordova Unified School District / 124,193 |
| 244. | 1,358.8/sq mi | Long Beach Unified School District / 517,243 |
| 245. | 1,358.7/sq mi | Lancaster Elementary School District / 114,402 |
| 246. | 1,356.4/sq mi | Solana Beach Elementary School District / 39,915 |
| 247. | 1,351.6/sq mi | Tulare City Elementary School District / 61,949 |
| 248. | 1,349.1/sq mi | Panama-Buena Vista Union Elementary School District / 125,006 |
| 249. | 1,345.4/sq mi | Center Joint Unified School District / 28,098 |
| 250. | 1,343.4/sq mi | Redding Elementary School District / 35,316 |
| 251. | 1,297.4/sq mi | San Rafael City High School District / 77,255 |
| 252. | 1,282.6/sq mi | Bakersfield City Elementary School District / 192,403 |
| 253. | 1,188.5/sq mi | Duarte Unified School District / 27,361 |
| 254. | 1,171.7/sq mi | Piner-Olivet Union Elementary School District / 16,084 |
| 255. | 1,163.3/sq mi | Hollister School District / 43,847 |
| 256. | 1,151.1/sq mi | Newhall Elementary School District / 74,701 |
| 257. | 1,141.9/sq mi | Santa Rosa High School District / 211,800 |
| 258. | 1,134.4/sq mi | Bellevue Union Elementary School District / 25,617 |
| 259. | 1,121.7/sq mi | Mill Valley Elementary School District / 31,133 |
| 260. | 1,103.9/sq mi | Empire Union Elementary School District / 25,081 |
| 261. | 1,080.9/sq mi | Saugus Union Elementary School District / 105,341 |
| 262. | 1,066.3/sq mi | Manteca Unified School District / 120,724 |
| 263. | 1,055.5/sq mi | Kashia Elementary School District / 71 |
| 264. | 1,045.9/sq mi | Ross Elementary School District / 2,502 |
| 265. | 1,006.5/sq mi | Brentwood Union Elementary School District / 56,903 |
| 266. | 1,005.7/sq mi | Clovis Unified School District / 193,968 |
| 267. | 1,004.1/sq mi | Temecula Valley Unified School District / 147,264 |
| 268. | 1,004.0/sq mi | Cinnabar Elementary School District / 2,441 |
| 269. | 996.4/sq mi | Cardiff Elementary School District / 12,234 |
| 270. | 983.6/sq mi | Perris Elementary School District / 47,912 |
| 271. | 982.5/sq mi | Grossmont Union High School District / 466,270 |
| 272. | 979.1/sq mi | Elk Grove Unified School District / 326,226 |
| 273. | 970.5/sq mi | Santa Paula Elementary School District / 28,138 |
| 274. | 966.5/sq mi | Moraga Elementary School District / 16,762 |
| 275. | 956.2/sq mi | Petaluma City Elementary School District / 32,335 |
| 276. | 950.7/sq mi | Palos Verdes Peninsula Unified School District / 61,812 |
| 277. | 942.9/sq mi | Hope Elementary School District / 15,956 |
| 278. | 942.0/sq mi | Oxnard Union High School District / 321,283 |
| 279. | 932.4/sq mi | Perris Union High School District / 168,828 |
| 280. | 930.6/sq mi | Merced City Elementary School District / 85,645 |
| 281. | 916.9/sq mi | Windsor Unified School District / 29,475 |
| 282. | 913.4/sq mi | Cold Spring Elementary School District / 3,473 |
| 283. | 912.4/sq mi | Lake Elsinore Unified School District / 123,062 |
| 284. | 910.0/sq mi | Laguna Salada Union Elementary School District / 37,980 |
| 285. | 893.6/sq mi | Alisal Union Elementary School District / 57,986 |
| 286. | 879.6/sq mi | Redlands Unified School District / 127,504 |
| 287. | 871.3/sq mi | Waugh Elementary School District / 6,323 |
| 288. | 851.4/sq mi | Romoland Elementary School District / 26,855 |
| 289. | 844.7/sq mi | Central Unified School District / 73,264 |
| 290. | 837.7/sq mi | Saratoga Union Elementary School District / 19,774 |
| 291. | 836.7/sq mi | Salida Union Elementary School District / 20,947 |
| 292. | 832.0/sq mi | Yucaipa-Calimesa Joint Unified School District / 60,586 |
| 293. | 828.9/sq mi | Ceres Unified School District / 54,452 |
| 294. | 824.9/sq mi | Visalia Unified School District / 145,530 |
| 295. | 824.5/sq mi | Las Virgenes Unified School District / 64,624 |
| 296. | 817.1/sq mi | Sebastopol Union Elementary School District / 12,316 |
| 297. | 809.5/sq mi | Santa Barbara High School District / 184,132 |
| 298. | 805.6/sq mi | Live Oak Elementary School District / 22,593 |
| 299. | 803.9/sq mi | Sulphur Springs Union Elementary School District / 62,728 |
| 300. | 793.6/sq mi | Dixie Elementary School District / 21,972 |
| 301. | 792.0/sq mi | Parlier Unified School District / 15,873 |
| 302. | 791.8/sq mi | Reed Union Elementary School District / 13,596 |
| 303. | 775.9/sq mi | Rohnerville Elementary School District / 6,053 |
| 304. | 762.1/sq mi | Atwater Elementary School District / 34,346 |
| 305. | 759.1/sq mi | Moorpark Unified School District / 36,271 |
| 306. | 758.2/sq mi | Benicia Unified School District / 27,540 |
| 307. | 755.6/sq mi | Dinuba Unified School District / 25,475 |
| 308. | 753.4/sq mi | Riverbank Unified School District / 15,602 |
| 309. | 751.9/sq mi | Scotts Valley Unified School District / 17,535 |
| 310. | 750.9/sq mi | Lamont Elementary School District / 17,451 |
| 311. | 748.9/sq mi | Vacaville Unified School District / 78,090 |
| 312. | 746.0/sq mi | Millbrae Elementary School District / 25,225 |
| 313. | 733.1/sq mi | Hesperia Unified School District / 102,594 |
| 314. | 732.8/sq mi | Castro Valley Unified School District / 51,341 |
| 315. | 715.5/sq mi | Lemoore Union Elementary School District / 26,464 |
| 316. | 712.3/sq mi | Travis Unified School District / 31,816 |
| 317. | 712.1/sq mi | Novato Unified School District / 60,309 |
| 318. | 704.0/sq mi | Delhi Unified School District / 12,049 |
| 319. | 686.6/sq mi | William S. Hart Union High School District / 272,531 |
| 320. | 686.5/sq mi | Rescue Union Elementary School District / 35,075 |
| 321. | 685.3/sq mi | Orinda Union Elementary School District / 18,325 |
| 322. | 681.5/sq mi | Beaumont Unified School District / 50,547 |
| 323. | 674.5/sq mi | Martinez Unified School District / 28,877 |
| 324. | 674.2/sq mi | Oakley Union Elementary School District / 34,885 |
| 325. | 672.3/sq mi | Keyes Union Elementary School District / 6,568 |
| 326. | 670.8/sq mi | Turlock Unified School District in Keyes Union / 6,551 |
| 327. | 669.5/sq mi | Salinas Union High School District / 173,987 |
| 328. | 664.0/sq mi | Buckeye Union Elementary School District / 37,679 |
| 329. | 661.5/sq mi | Santa Cruz City Elementary School District / 64,200 |
| 330. | 653.1/sq mi | Claremont Unified School District / 41,524 |
| 331. | 650.2/sq mi | Standard Elementary School District / 24,375 |
| 332. | 648.1/sq mi | Brisbane Elementary School District / 8,353 |
| 333. | 647.9/sq mi | Pioneer Union Elementary School District / 11,450 |
| 334. | 647.3/sq mi | Calexico Unified School District / 39,652 |
| 335. | 641.0/sq mi | Yuba City Unified School District / 74,090 |
| 336. | 639.2/sq mi | Murrieta Valley Unified School District / 107,409 |
| 337. | 637.9/sq mi | Mark West Union Elementary School District / 14,831 |
| 338. | 636.9/sq mi | Santa Monica-Malibu Unified School District / 110,934 |
| 339. | 635.5/sq mi | Oak Park Unified School District / 14,685 |
| 340. | 627.7/sq mi | Santa Rita Union Elementary School District / 24,238 |
| 341. | 626.2/sq mi | Gravenstein Union Elementary School District / 5,850 |
| 342. | 626.0/sq mi | John Swett Unified School District / 14,876 |
| 343. | 618.3/sq mi | Milpitas Unified School District / 68,611 |
| 344. | 618.2/sq mi | Rincon Valley Union Elementary School District / 38,295 |
| 345. | 616.9/sq mi | Los Gatos Union Elementary School District / 28,815 |
| 346. | 614.3/sq mi | Arcata Elementary School District / 14,464 |
| 347. | 612.0/sq mi | Heber Elementary School District / 7,129 |
| 348. | 591.0/sq mi | Alta Vista Elementary School District / 3,523 |
| 349. | 585.0/sq mi | Davis Joint Unified School District / 75,668 |
| 350. | 583.6/sq mi | Auburn Union Elementary School District / 35,333 |
| 351. | 582.1/sq mi | Soulsbyville Elementary School District / 4,210 |
| 352. | 581.2/sq mi | Lakeside Union Elementary School District / 40,961 |
| 353. | 579.3/sq mi | Bayshore Elementary School District / 6,092 |
| 354. | 558.8/sq mi | Ackerman Elementary School District / 2,423 |
| 355. | 553.1/sq mi | Goleta Union Elementary School District / 78,423 |
| 356. | 552.7/sq mi | Selma Unified School District / 29,495 |
| 357. | 538.1/sq mi | Cascade Union Elementary School District / 14,604 |
| 358. | 537.0/sq mi | Lodi Unified School District / 169,048 |
| 359. | 521.7/sq mi | Kentfield Elementary School District / 11,874 |
| 360. | 520.8/sq mi | Laguna Beach Unified School District / 28,582 |
| 361. | 520.8/sq mi | Bennett Valley Union Elementary School District / 9,386 |
| 362. | 515.6/sq mi | San Jacinto Unified School District / 47,122 |
| 363. | 509.1/sq mi | Beardsley Elementary School District / 16,745 |
| 364. | 506.4/sq mi | Liberty Union High School District / 110,305 |
| 365. | 502.1/sq mi | Sausalito Elementary School District / 10,913 |
| 366. | 497.3/sq mi | Loomis Union Elementary School District / 22,475 |
| 367. | 495.7/sq mi | Pajaro Valley Joint Unified School District / 116,358 |
| 368. | 490.8/sq mi | Columbia Elementary School District / 9,631 |
| 369. | 473.9/sq mi | Lammersville Elementary School District / 11,012 |
| 370. | 473.2/sq mi | Galt Joint Union Elementary School District / 29,087 |
| 371. | 466.8/sq mi | Fairfield-Suisun Unified School District / 131,391 |
| 372. | 454.2/sq mi | Azusa Unified School District / 68,134 |
| 373. | 442.3/sq mi | Cutten Elementary School District / 5,179 |
| 374. | 440.3/sq mi | Napa Valley Unified School District / 117,280 |
| 375. | 427.8/sq mi | Union Hill Elementary School District / 2,547 |
| 376. | 411.6/sq mi | Grass Valley Elementary School District / 23,916 |
| 377. | 407.1/sq mi | Lindsay Unified School District / 17,520 |
| 378. | 390.7/sq mi | Tamalpais Union High School District / 114,934 |
| 379. | 388.1/sq mi | Los Gatos-Saratoga Joint Union School District / 55,165 |
| 380. | 376.8/sq mi | Santa Cruz City High School District / 93,359 |
| 381. | 375.4/sq mi | Thermalito Union Elementary School District / 17,795 |
| 382. | 372.7/sq mi | Tracy Joint Unified School District / 76,923 |
| 383. | 372.7/sq mi | North Monterey County Unified School District / 26,775 |
| 384. | 371.5/sq mi | Livingston Union Elementary School District / 16,084 |
| 385. | 366.5/sq mi | Central Union High School District / 57,394 |
| 386. | 363.6/sq mi | Washington Colony Elementary School District / 2,631 |
| 387. | 357.5/sq mi | Dinuba Unified (9-12) in Kings River Union / 2,241 |
| 388. | 352.6/sq mi | Sonora Elementary School District / 9,395 |
| 389. | 351.6/sq mi | Sonoma Valley Unified School District / 42,427 |
| 390. | 351.2/sq mi | McKinleyville Union Elementary School District / 16,638 |
| 391. | 344.5/sq mi | Orange Center Elementary School District / 1,845 |
| 392. | 342.1/sq mi | Fortuna Union Elementary School District / 7,443 |
| 393. | 340.6/sq mi | Palm Springs Unified School District / 170,230 |
| 394. | 337.4/sq mi | Newcastle Elementary School District / 2,550 |
| 395. | 335.3/sq mi | Waterford Unified School District / 9,673 |
| 396. | 334.8/sq mi | Livermore Valley Joint Unified School District / 88,647 |
| 397. | 330.0/sq mi | Portola Valley Elementary School District / 6,520 |
| 398. | 329.8/sq mi | Hughson Unified School District / 9,728 |
| 399. | 326.8/sq mi | Chico Unified School District / 108,355 |
| 400. | 325.4/sq mi | Kingsburg Joint Union Elementary School District / 15,387 |
| 401. | 325.1/sq mi | Pacheco Union Elementary School District / 8,849 |
| 402. | 323.3/sq mi | Oak Grove Union Elementary School District / 4,903 |
| 403. | 322.6/sq mi | Montecito Union Elementary School District / 6,108 |
| 404. | 320.3/sq mi | Pacific Union Elementary School District / 5,155 |
| 405. | 315.8/sq mi | Ripon Unified School District / 17,319 |
| 406. | 313.8/sq mi | Delano Union Elementary School District / 55,166 |
| 407. | 305.8/sq mi | Placerville Union Elementary School District / 14,810 |
| 408. | 300.7/sq mi | Western Placer Unified School District / 51,543 |
| 409. | 295.7/sq mi | Twin Hills Union Elementary School District / 5,726 |
| 410. | 294.4/sq mi | Woodside Elementary School District / 3,436 |
| 411. | 293.7/sq mi | Santa Paula Union High School District / 31,924 |
| 412. | 293.0/sq mi | Rancho Santa Fe Elementary School District / 5,460 |
| 413. | 291.6/sq mi | Victor Valley Union High School District / 160,967 |
| 414. | 290.9/sq mi | Brawley Elementary School District / 26,358 |
| 415. | 284.2/sq mi | Petaluma Joint Union High School District / 75,277 |
| 416. | 283.9/sq mi | Sanger Unified School District / 50,298 |
| 417. | 281.5/sq mi | Hanford Joint Union High School District / 70,552 |
| 418. | 280.4/sq mi | Old Adobe Union Elementary School District / 25,545 |
| 419. | 277.0/sq mi | Wilmar Union Elementary School District / 3,125 |
| 420. | 273.2/sq mi | Ventura Unified School District / 120,616 |
| 421. | 272.2/sq mi | Fowler Unified School District / 10,546 |
| 422. | 270.1/sq mi | Oroville City Elementary School District / 22,764 |
| 423. | 269.9/sq mi | Antelope Valley Union High School District / 376,846 |
| 424. | 268.6/sq mi | Gilroy Unified School District / 60,101 |
| 425. | 266.3/sq mi | Placer Hills Union Elementary School District / 13,707 |
| 426. | 266.0/sq mi | Healdsburg Unified School District / 15,104 |
| 427. | 265.1/sq mi | San Lorenzo Valley Unified School District / 24,210 |
| 428. | 265.1/sq mi | Mother Lode Union Elementary School District / 16,464 |
| 429. | 264.5/sq mi | Apple Valley Unified School District / 78,319 |
| 430. | 263.1/sq mi | Forestville Union Elementary School District / 7,143 |
| 431. | 261.8/sq mi | Carpinteria Unified School District / 18,090 |
| 432. | 260.2/sq mi | Curtis Creek Elementary School District / 9,364 |
| 433. | 255.3/sq mi | Liberty Elementary School District / 2,115 |
| 434. | 253.8/sq mi | Kings River Union Elementary School District / 3,468 |
| 435. | 252.8/sq mi | Lagunitas Elementary School District / 4,154 |
| 436. | 249.2/sq mi | San Luis Coastal Unified School District / 90,461 |
| 437. | 245.8/sq mi | Merced Union High School District / 172,168 |
| 438. | 245.1/sq mi | Nuview Union Elementary School District / 10,327 |
| 439. | 244.6/sq mi | Oakdale Joint Unified School District / 29,488 |
| 440. | 240.7/sq mi | Desert Sands Unified School District / 183,446 |
| 441. | 238.9/sq mi | Junction Elementary School District / 4,056 |
| 442. | 238.4/sq mi | Pleasant Valley Elementary School District / 8,253 |
| 443. | 235.1/sq mi | Madera Unified School District / 90,738 |
| 444. | 234.7/sq mi | Howell Mountain Elementary School District / 4,132 |
| 445. | 232.1/sq mi | Ophir Elementary School District / 1,755 |
| 446. | 231.1/sq mi | Santa Maria Joint Union High School District / 144,755 |
| 447. | 231.0/sq mi | Richland-Lerdo Union Elementary School District / 19,667 |
| 448. | 230.1/sq mi | Bonsall Union Elementary School District / 16,165 |
| 449. | 229.2/sq mi | Ballard Elementary School District / 1,492 |
| 450. | 227.0/sq mi | Happy Valley Elementary School District / 1,496 |
| 451. | 219.6/sq mi | Westside Union Elementary School District / 69,226 |
| 452. | 219.4/sq mi | Tulare Joint Union High School District / 79,949 |
| 453. | 219.3/sq mi | Wasco Union Elementary School District / 26,615 |
| 454. | 215.7/sq mi | Soledad Unified School District / 26,464 |
| 455. | 215.4/sq mi | Rim of the World Unified School District / 26,147 |
| 456. | 212.2/sq mi | Morgan Hill Unified School District / 61,068 |
| 457. | 212.1/sq mi | Pleasant Ridge Union Elementary School District / 20,374 |
| 458. | 211.4/sq mi | Washington Union High School District / 18,639 |
| 459. | 211.4/sq mi | Fallbrook Union Elementary School District / 62,413 |
| 460. | 208.8/sq mi | Fallbrook Union High School District / 80,574 |
| 461. | 207.1/sq mi | Hemet Unified School District / 136,298 |
| 462. | 206.5/sq mi | Ramona City Unified School District / 35,871 |
| 463. | 205.1/sq mi | Chowchilla Elementary School District / 22,573 |
| 464. | 204.5/sq mi | Kern Union High School District / 614,756 |
| 465. | 202.8/sq mi | Byron Union Elementary School District / 15,914 |
| 466. | 200.6/sq mi | Woodland Joint Unified School District / 62,584 |
| 467. | 198.0/sq mi | Alpine Union Elementary School District / 19,010 |
| 468. | 197.1/sq mi | Pacific Union Elementary School District / 3,850 |
| 469. | 190.1/sq mi | Castaic Union Elementary School District / 29,761 |
| 470. | 189.4/sq mi | Chicago Park Elementary School District / 1,302 |
| 471. | 187.8/sq mi | Kingsburg Joint Union High School District / 18,469 |
| 472. | 187.3/sq mi | Orcutt Union Elementary School District / 36,783 |
| 473. | 175.9/sq mi | Paradise Unified School District / 39,625 |
| 474. | 174.6/sq mi | Weaver Union Elementary School District / 12,719 |
| 475. | 173.8/sq mi | Snowline Joint Unified School District / 37,760 |
| 476. | 170.9/sq mi | Porterville Unified School District / 50,383 |
| 477. | 170.1/sq mi | Adelanto Elementary School District / 57,092 |
| 478. | 169.6/sq mi | Gold Oak Union Elementary School District / 8,823 |
| 479. | 168.4/sq mi | Red Bluff Union Elementary School District / 19,937 |
| 480. | 165.5/sq mi | Woodville Elementary School District / 3,156 |
| 481. | 165.0/sq mi | Anderson Union High School District / 39,665 |
| 482. | 164.9/sq mi | Kenwood Elementary School District / 4,041 |
| 483. | 161.8/sq mi | Solvang Elementary School District / 5,812 |
| 484. | 160.6/sq mi | Hart-Ransom Union Elementary School District / 4,285 |
| 485. | 160.6/sq mi | Taft City Elementary School District / 18,790 |
| 486. | 158.8/sq mi | Happy Valley Union Elementary School District / 6,126 |
| 487. | 157.0/sq mi | Franklin Elementary School District / 2,444 |
| 488. | 155.8/sq mi | Pleasant View Elementary School District / 2,803 |
| 489. | 153.3/sq mi | Delano Joint Union High School District / 71,140 |
| 490. | 152.0/sq mi | Washington Union Elementary School District / 6,271 |
| 491. | 149.9/sq mi | Denair Unified School District / 8,450 |
| 492. | 149.3/sq mi | Mesa Union Elementary School District / 4,276 |
| 493. | 149.0/sq mi | Southside Elementary School District / 1,967 |
| 494. | 148.6/sq mi | Lemoore Union High School District / 37,960 |
| 495. | 146.1/sq mi | Lucia Mar Unified School District / 77,333 |
| 496. | 145.1/sq mi | Galt Joint Union High School District / 37,524 |
| 497. | 144.2/sq mi | Guerneville Elementary School District / 4,474 |
| 498. | 142.4/sq mi | Liberty Elementary School District / 1,786 |
| 499. | 141.7/sq mi | Briggs Elementary School District / 3,149 |
| 500. | 141.6/sq mi | Banta Elementary School District / 5,277 |
| 501. | 140.7/sq mi | Guadalupe Union Elementary School District / 7,230 |
| 502. | 140.1/sq mi | Cabrillo Unified School District / 25,629 |
| 503. | 139.6/sq mi | Yosemite Unified School District / 10,167 |
| 504. | 138.5/sq mi | West Park Elementary School District / 1,794 |
| 505. | 137.1/sq mi | South Bay Union Elementary School District / 7,227 |
| 506. | 136.6/sq mi | Lake Tahoe Unified School District / 28,631 |
| 507. | 135.1/sq mi | Elverta Joint Elementary School District / 3,324 |
| 507. | 135.1/sq mi | Twin Rivers Unified School District in Elverta / 3,324 |
| 509. | 134.1/sq mi | Kerman Unified School District / 18,645 |
| 510. | 132.5/sq mi | Paso Robles Joint Unified School District / 41,291 |
| 511. | 131.2/sq mi | Marysville Joint Unified School District / 61,532 |
| 512. | 131.1/sq mi | La Canada Unified School District / 18,300 |
| 513. | 130.6/sq mi | Antelope Elementary School District / 5,303 |
| 514. | 129.9/sq mi | Edison Elementary School District / 6,233 |
| 515. | 129.7/sq mi | Gold Trail Union Elementary School District / 6,087 |
| 516. | 128.7/sq mi | Grant Elementary School District / 3,157 |
| 517. | 128.0/sq mi | Richgrove Elementary School District / 3,389 |
| 518. | 127.8/sq mi | Paradise Elementary School District / 809 |
| 519. | 126.8/sq mi | Peninsula Union Elementary School District / 508 |
| 520. | 125.4/sq mi | San Pasqual Union Elementary School District / 3,643 |
| 521. | 125.1/sq mi | Vineland Elementary School District / 4,250 |
| 522. | 124.0/sq mi | El Dorado Union High School District / 139,364 |
| 523. | 123.4/sq mi | Golden Valley Unified School District / 10,471 |
| 524. | 123.0/sq mi | Jacoby Creek Elementary School District / 2,847 |
| 525. | 122.1/sq mi | Earlimart Elementary School District / 11,009 |
| 526. | 121.6/sq mi | Armona Union Elementary School District / 6,109 |
| 527. | 121.1/sq mi | Ocean View Elementary School District / 17,485 |
| 528. | 119.7/sq mi | West Sonoma County Union High School District / 47,974 |
| 529. | 118.7/sq mi | Sonora Union High School District / 39,086 |
| 530. | 118.2/sq mi | Exeter Union Elementary School District / 13,492 |
| 531. | 115.7/sq mi | Ojai Unified School District / 21,920 |
| 532. | 114.5/sq mi | Palermo Union Elementary School District / 7,779 |
| 533. | 114.5/sq mi | Banning Unified School District / 35,042 |
| 534. | 114.4/sq mi | Freshwater Elementary School District / 2,498 |
| 535. | 114.0/sq mi | Caruthers Unified School District / 5,201 |
| 536. | 113.8/sq mi | Gridley Unified School District / 9,876 |
| 537. | 113.6/sq mi | Gratton Elementary School District / 574 |
| 538. | 113.3/sq mi | Plumas Elementary School District / 4,183 |
| 539. | 113.1/sq mi | Jefferson Elementary School District / 15,572 |
| 540. | 113.0/sq mi | Ready Springs Union Elementary School District / 5,563 |
| 541. | 112.8/sq mi | Belleview Elementary School District / 1,729 |
| 542. | 112.3/sq mi | Dixon Unified School District / 22,194 |
| 543. | 110.5/sq mi | Nevada Joint Union High School District / 81,741 |
| 544. | 108.7/sq mi | Monson-Sultana Joint Union Elementary School District / 2,393 |
| 544. | 108.7/sq mi | Dinuba Unified (9-12) in Monson-Sultana Joint Union / 2,393 |
| 546. | 108.7/sq mi | Live Oak Unified School District / 10,307 |
| 547. | 107.8/sq mi | Kelseyville Unified School District / 13,620 |
| 548. | 107.5/sq mi | Rio Dell Elementary School District / 3,435 |
| 549. | 106.8/sq mi | Planada Elementary School District / 5,312 |
| 550. | 106.7/sq mi | Dunham Elementary School District / 889 |
| 551. | 106.3/sq mi | Chowchilla Union High School District / 24,076 |
| 552. | 106.2/sq mi | Seeley Union Elementary School District / 2,436 |
| 553. | 105.1/sq mi | Meadows Union Elementary School District / 1,967 |
| 554. | 104.3/sq mi | Manzanita Elementary School District / 1,193 |
| 555. | 104.1/sq mi | Placer Union High School District / 89,490 |
| 556. | 103.4/sq mi | Bonny Doon Union Elementary School District / 2,994 |
| 557. | 102.7/sq mi | Mountain Elementary School District / 1,422 |
| 558. | 102.0/sq mi | Templeton Unified School District / 10,269 |
| 559. | 100.9/sq mi | Rockford Elementary School District / 1,076 |
| 560. | 100.1/sq mi | Fieldbrook Elementary School District / 838 |
| 561. | 100.0/sq mi | Somis Union Elementary School District / 3,237 |
| 562. | 99.4/sq mi | Monroe Elementary School District / 1,095 |
| 563. | 98.5/sq mi | Clay Joint Elementary School District / 519 |
| 564. | 98.4/sq mi | Vallecitos Elementary School District / 1,996 |
| 565. | 98.2/sq mi | Strathmore Union Elementary School District / 6,354 |
| 566. | 98.2/sq mi | Exeter Union High School District / 16,293 |
| 567. | 98.1/sq mi | Wilsona Elementary School District / 9,857 |
| 568. | 97.7/sq mi | Loma Prieta Joint Union Elementary School District / 3,920 |
| 569. | 97.5/sq mi | Eastside Union Elementary School District / 24,787 |
| 570. | 96.8/sq mi | Dehesa Elementary School District / 1,990 |
| 571. | 93.7/sq mi | Nevada City Elementary School District / 15,471 |
| 572. | 91.6/sq mi | Escalon Unified School District / 14,793 |
| 573. | 91.1/sq mi | North Cow Creek Elementary School District / 1,514 |
| 574. | 91.0/sq mi | Hilmar Unified School District / 9,946 |
| 575. | 90.5/sq mi | Gonzales Unified School District / 9,375 |
| 576. | 89.6/sq mi | Harmony Union Elementary School District / 4,466 |
| 577. | 89.6/sq mi | Ukiah Unified School District / 40,931 |
| 578. | 88.7/sq mi | Corning Union Elementary School District / 14,544 |
| 579. | 88.3/sq mi | Spreckels Union Elementary School District / 6,822 |
| 580. | 85.9/sq mi | Lucerne Elementary School District / 3,808 |
| 581. | 84.1/sq mi | McFarland Unified School District / 13,750 |
| 582. | 84.0/sq mi | Columbia Union Elementary School District / 6,483 |
| 583. | 83.8/sq mi | Lakeside Joint Elementary School District / 2,656 |
| 584. | 83.7/sq mi | Knightsen Elementary School District / 2,603 |
| 585. | 81.9/sq mi | Valley Center-Pauma Unified School District / 24,700 |
| 586. | 81.2/sq mi | Buellton Union Elementary School District / 5,507 |
| 587. | 80.5/sq mi | Oroville Union High School District / 53,808 |
| 588. | 78.5/sq mi | Bear Valley Unified School District / 18,707 |
| 589. | 78.3/sq mi | Sundale Union Elementary School District / 2,667 |
| 590. | 78.0/sq mi | Kings Canyon Joint Unified School District / 46,807 |
| 591. | 77.7/sq mi | Laton Joint Unified School District / 3,397 |
| 592. | 77.3/sq mi | Lakeport Unified School District / 9,911 |
| 593. | 75.5/sq mi | McCabe Union Elementary School District / 7,012 |
| 594. | 74.6/sq mi | Calistoga Joint Unified School District / 7,309 |
| 595. | 73.4/sq mi | Colfax Elementary School District / 5,793 |
| 596. | 73.2/sq mi | Winters Joint Unified School District / 9,392 |
| 597. | 73.2/sq mi | Patterson Joint Unified School District / 26,374 |
| 598. | 72.7/sq mi | Wheatland Union High School District / 11,345 |
| 599. | 72.0/sq mi | King City Union Elementary School District / 16,889 |
| 600. | 71.7/sq mi | Terra Bella Union Elementary School District / 5,354 |
| 601. | 70.1/sq mi | Johnstonville Elementary School District / 1,323 |
| 602. | 69.7/sq mi | Tehachapi Unified School District / 34,595 |
| 603. | 69.2/sq mi | Corcoran Joint Unified School District / 25,376 |
| 604. | 69.0/sq mi | Cloverdale Unified School District / 10,634 |
| 605. | 68.7/sq mi | Pixley Union Elementary School District / 5,179 |
| 606. | 68.6/sq mi | Linden Unified School District / 11,778 |
| 607. | 68.4/sq mi | Cottonwood Union Elementary School District / 10,086 |
| 608. | 68.2/sq mi | Coachella Valley Unified School District / 85,356 |
| 609. | 67.8/sq mi | Keppel Union Elementary School District / 20,554 |
| 610. | 67.3/sq mi | Konocti Unified School District / 22,250 |
| 611. | 65.8/sq mi | Greenfield Union Elementary School District / 17,579 |
| 612. | 65.6/sq mi | Middletown Unified School District / 9,865 |
| 613. | 65.4/sq mi | Turlock Unified School District in Chatom Union / 4,174 |
| 614. | 65.1/sq mi | Chatom Union Elementary School District / 4,157 |
| 615. | 64.7/sq mi | Southern Kern Unified School District / 19,800 |
| 616. | 64.4/sq mi | Two Rock Union Elementary School District / 1,813 |
| 617. | 64.1/sq mi | Arvin Union Elementary School District / 20,219 |
| 618. | 63.8/sq mi | Tipton Elementary School District / 3,134 |
| 619. | 63.7/sq mi | Northern Humboldt Union High School District / 45,602 |
| 620. | 63.6/sq mi | Helendale Elementary School District / 6,313 |
| 621. | 63.6/sq mi | Hydesville Elementary School District / 1,381 |
| 622. | 63.2/sq mi | Alvina Elementary School District / 442 |
| 623. | 62.9/sq mi | Woodlake Union Elementary School District / 9,633 |
| 624. | 62.4/sq mi | Gerber Union Elementary School District / 3,726 |
| 625. | 61.6/sq mi | Oak View Union Elementary School District / 2,836 |
| 626. | 61.3/sq mi | Amador County Unified School District / 37,159 |
| 627. | 60.3/sq mi | Sunnyside Union Elementary School District / 2,221 |
| 628. | 60.1/sq mi | Wheatland Elementary School District / 7,162 |
| 629. | 59.9/sq mi | Brittan Elementary School District / 3,760 |
| 630. | 59.5/sq mi | Yreka Union Elementary School District / 9,608 |
| 631. | 59.2/sq mi | Latrobe Elementary School District / 3,273 |
| 632. | 59.1/sq mi | Clear Creek Elementary School District / 1,804 |
| 633. | 58.5/sq mi | Los Banos Unified School District / 40,166 |
| 634. | 58.0/sq mi | Kings River-Hardwick Union Elementary School District / 2,613 |
| 635. | 58.0/sq mi | Hamilton Union Elementary School District / 2,911 |
| 636. | 57.9/sq mi | Aromas-San Juan Unified School District / 4,154 |
| 637. | 57.8/sq mi | Montague Elementary School District / 2,229 |
| 638. | 57.4/sq mi | Central Union Elementary School District / 10,098 |
| 639. | 57.3/sq mi | Rio Bravo-Greeley Union Elementary School District / 5,425 |
| 640. | 55.9/sq mi | Shasta Union High School District / 102,297 |
| 641. | 55.4/sq mi | Hamilton Union High School District / 3,462 |
| 642. | 54.8/sq mi | American Union Elementary School District / 2,122 |
| 643. | 54.8/sq mi | Colusa Unified School District / 7,951 |
| 644. | 54.4/sq mi | Sequoia Union Elementary School District / 1,993 |
| 645. | 53.5/sq mi | Jamul-Dulzura Union Elementary School District / 8,727 |
| 646. | 52.8/sq mi | Acton-Agua Dulce Unified School District / 11,329 |
| 647. | 52.8/sq mi | Riverdale Joint Unified School District / 7,027 |
| 648. | 52.4/sq mi | Spencer Valley Elementary School District / 514 |
| 649. | 52.3/sq mi | Firebaugh-Las Deltas Joint Unified School District / 8,854 |
| 650. | 52.2/sq mi | Morongo Unified School District / 70,035 |
| 651. | 51.8/sq mi | Hickman Elementary School District / 1,030 |
| 652. | 51.8/sq mi | Richfield Elementary School District / 1,230 |
| 653. | 51.7/sq mi | Mount Shasta Union Elementary School District / 7,034 |
| 654. | 51.5/sq mi | Palo Verde Union Elementary School District / 2,538 |
| 655. | 51.0/sq mi | New Jerusalem Elementary School District / 1,941 |
| 656. | 50.5/sq mi | McSwain Union Elementary School District / 5,777 |
| 657. | 49.9/sq mi | San Benito High School District / 51,226 |
| 658. | 49.2/sq mi | Carmel Unified School District / 22,836 |
| 659. | 48.7/sq mi | Tahoe-Truckee Joint Unified School District / 30,275 |
| 660. | 47.7/sq mi | Lakeside Union Elementary School District / 2,635 |
| 661. | 47.3/sq mi | Jamestown Elementary School District / 7,905 |
| 662. | 46.6/sq mi | Lake Elementary School District / 509 |
| 663. | 46.5/sq mi | Hope Elementary School District / 673 |
| 664. | 46.5/sq mi | Canyon Elementary School District / 181 |
| 665. | 46.0/sq mi | Vallecito Union Elementary School District / 9,207 |
| 666. | 45.6/sq mi | Lompoc Unified School District / 58,564 |
| 667. | 45.3/sq mi | Oak Valley Union Elementary School District / 1,343 |
| 668. | 45.2/sq mi | Le Grand Union High School District / 8,121 |
| 669. | 44.8/sq mi | Orland Joint Unified School District / 12,854 |
| 670. | 44.4/sq mi | Bret Harte Union High School District / 19,135 |
| 671. | 44.4/sq mi | Loleta Union Elementary School District / 1,306 |
| 672. | 44.3/sq mi | Capay Joint Union Elementary School District / 1,046 |
| 673. | 44.1/sq mi | Shiloh Elementary School District / 793 |
| 674. | 44.1/sq mi | Shasta Union Elementary School District / 2,311 |
| 675. | 43.4/sq mi | Gateway Unified School District / 28,594 |
| 676. | 43.2/sq mi | Lakeside Union Elementary School District / 7,182 |
| 677. | 43.1/sq mi | Mark Twain Union Elementary School District / 9,928 |
| 678. | 43.0/sq mi | Gustine Unified School District / 8,505 |
| 679. | 42.7/sq mi | North County Joint Union Elementary School District / 3,814 |
| 680. | 42.5/sq mi | Calaveras Unified School District / 25,786 |
| 681. | 42.4/sq mi | Pollock Pines Elementary School District / 8,439 |
| 682. | 42.3/sq mi | Ballico-Cressey Elementary School District / 2,442 |
| 683. | 41.7/sq mi | Fillmore Unified School District / 19,646 |
| 684. | 41.6/sq mi | Bella Vista Elementary School District / 3,755 |
| 685. | 41.5/sq mi | Yosemite Unified School District in Bass Lake / 11,644 |
| 685. | 41.5/sq mi | Bass Lake Joint Union Elementary School District / 11,644 |
| 687. | 41.3/sq mi | Fort Bragg Unified School District / 14,409 |
| 688. | 40.9/sq mi | River Delta Joint Unified School District / 15,056 |
| 689. | 40.7/sq mi | Stone Corral Elementary School District / 786 |
| 690. | 40.3/sq mi | Kit Carson Union Elementary School District / 2,801 |
| 691. | 39.4/sq mi | Camino Union Elementary School District / 4,119 |
| 692. | 39.4/sq mi | Willits Unified School District / 12,686 |
| 693. | 39.3/sq mi | Wasco Union High School District / 30,282 |
| 694. | 39.0/sq mi | Mendota Unified School District / 12,523 |
| 695. | 38.8/sq mi | Imperial Unified School District / 22,164 |
| 696. | 38.6/sq mi | Raisin City Elementary School District / 1,642 |
| 697. | 38.6/sq mi | El Tejon Unified School District / 8,549 |
| 698. | 38.4/sq mi | Arcohe Union Elementary School District / 4,471 |
| 699. | 38.3/sq mi | Fortuna Union High School District / 21,848 |
| 700. | 37.2/sq mi | Kernville Union Elementary School District / 10,709 |
| 701. | 36.4/sq mi | Sierra Sands Unified School District / 35,295 |
| 702. | 35.4/sq mi | Taft Union High School District / 19,725 |
| 703. | 35.0/sq mi | Nuestro Elementary School District / 334 |
| 704. | 34.8/sq mi | Newman-Crows Landing Unified School District / 12,946 |
| 705. | 34.8/sq mi | Traver Joint Elementary School District / 1,336 |
| 706. | 34.1/sq mi | Outside Creek Elementary School District / 517 |
| 707. | 34.0/sq mi | Cayucos Elementary School District / 2,628 |
| 708. | 33.4/sq mi | Brawley Union High School District / 28,739 |
| 709. | 32.9/sq mi | Island Union Elementary School District / 1,398 |
| 710. | 32.7/sq mi | New Hope Elementary School District / 1,130 |
| 711. | 32.4/sq mi | Sutter Union High School District / 7,808 |
| 712. | 32.1/sq mi | St. Helena Unified School District / 10,147 |
| 713. | 32.1/sq mi | Cutler-Orosi Joint Unified School District / 18,356 |
| 714. | 31.3/sq mi | Monte Rio Union Elementary School District / 1,713 |
| 715. | 31.2/sq mi | Black Oak Mine Unified School District / 12,869 |
| 716. | 30.7/sq mi | San Miguel Joint Union Elementary School District / 5,978 |
| 717. | 30.6/sq mi | Los Alamos Elementary School District / 2,135 |
| 718. | 30.5/sq mi | Gonzales Unified (9-12) School District / 2,020 |
| 718. | 30.5/sq mi | Chualar Union Elementary School District / 2,020 |
| 720. | 30.4/sq mi | Coalinga-Huron Joint Unified School District / 27,911 |
| 721. | 30.4/sq mi | Atascadero Unified School District / 36,499 |
| 722. | 30.3/sq mi | Dos Palos-Oro Loma Joint Unified School District / 11,228 |
| 723. | 30.2/sq mi | Willows Unified School District / 9,285 |
| 724. | 30.0/sq mi | Reef-Sunset Unified School District / 16,401 |
| 725. | 29.6/sq mi | Hughes-Elizabeth Lakes Union Elementary School District / 3,339 |
| 726. | 29.2/sq mi | Le Grand Union Elementary School District / 2,281 |
| 727. | 28.6/sq mi | Browns Elementary School District / 930 |
| 728. | 28.6/sq mi | Bangor Union Elementary School District / 1,141 |
| 729. | 27.8/sq mi | Corning Union High School District / 17,016 |
| 730. | 27.6/sq mi | Dunsmuir Elementary School District / 2,023 |
| 731. | 27.2/sq mi | Meridian Elementary School District / 686 |
| 732. | 26.9/sq mi | Durham Unified School District / 4,889 |
| 733. | 26.5/sq mi | Janesville Union Elementary School District / 3,515 |
| 734. | 25.8/sq mi | Mupu Elementary School District / 1,029 |
| 735. | 25.2/sq mi | Biggs Unified School District / 3,382 |
| 736. | 24.8/sq mi | Porterville Unified (9-12) School District / 47,472 |
| 737. | 24.1/sq mi | Allensworth Elementary School District / 489 |
| 738. | 23.9/sq mi | Trinity Alps Unified School District / 4,025 |
| 739. | 23.9/sq mi | Calipatria Unified School District / 12,196 |
| 740. | 23.3/sq mi | El Nido Elementary School District / 1,763 |
| 741. | 23.3/sq mi | Williams Unified School District / 5,977 |
| 742. | 23.2/sq mi | Mammoth Unified School District / 9,463 |
| 743. | 23.1/sq mi | Palo Verde Unified School District / 24,086 |
| 744. | 22.8/sq mi | Del Norte County Unified School District / 28,066 |
| 745. | 22.5/sq mi | Waukena Joint Union Elementary School District / 1,059 |
| 746. | 22.2/sq mi | Trinidad Union Elementary School District / 1,683 |
| 747. | 21.4/sq mi | Black Butte Union Elementary School District / 3,986 |
| 748. | 21.2/sq mi | Red Bluff Joint Union High School District / 42,864 |
| 749. | 21.1/sq mi | Di Giorgio Elementary School District / 1,111 |
| 750. | 21.0/sq mi | Blue Lake Union Elementary School District / 2,511 |
| 751. | 20.7/sq mi | Ferndale Unified School District / 3,078 |
| 752. | 20.7/sq mi | Coast Unified School District / 7,176 |
| 753. | 20.3/sq mi | King City Joint Union High School District / 38,370 |
| 754. | 20.0/sq mi | Golden Plains Unified School District / 7,255 |
| 755. | 19.9/sq mi | Evergreen Union Elementary School District / 9,834 |
| 756. | 19.9/sq mi | Grenada Elementary School District / 1,076 |
| 757. | 19.4/sq mi | Mojave Unified School District / 18,025 |
| 758. | 19.2/sq mi | Millville Elementary School District / 1,853 |
| 759. | 19.1/sq mi | Columbine Elementary School District / 335 |
| 760. | 19.1/sq mi | Nicasio Elementary School District / 687 |
| 761. | 19.0/sq mi | Barstow Unified School District / 34,365 |
| 762. | 18.8/sq mi | Pioneer Union Elementary School District / 4,351 |
| 763. | 18.7/sq mi | Big Springs Union Elementary School District / 1,645 |
| 764. | 18.6/sq mi | Richmond Elementary School District / 1,024 |
| 765. | 18.6/sq mi | Maple Elementary School District / 631 |
| 766. | 18.6/sq mi | Trinity Alps Unified School District in Lewiston / 1,968 |
| 766. | 18.6/sq mi | Lewiston Elementary School District / 1,968 |
| 768. | 18.4/sq mi | East Nicolaus Joint Union High School District / 2,714 |
| 769. | 18.4/sq mi | Lagunita Elementary School District / 314 |
| 770. | 18.3/sq mi | Pierce Joint Unified School District / 6,367 |
| 771. | 18.1/sq mi | Citrus South Tule Elementary School District / 509 |
| 772. | 17.4/sq mi | La Honda-Pescadero Unified School District / 3,678 |
| 773. | 17.1/sq mi | Kirkwood Elementary School District / 318 |
| 774. | 17.0/sq mi | Montgomery Elementary School District / 807 |
| 775. | 16.7/sq mi | Alpaugh Unified School District / 1,173 |
| 776. | 16.6/sq mi | Pleasant Grove Joint Union Elementary School District / 867 |
| 777. | 16.6/sq mi | Potter Valley Community Unified School District / 2,612 |
| 778. | 16.3/sq mi | Santa Ynez Valley Union High School District / 20,599 |
| 779. | 16.3/sq mi | Valley Home Joint Elementary School District / 1,667 |
| 780. | 16.1/sq mi | Mountain Empire Unified School District / 10,652 |
| 781. | 15.8/sq mi | Esparto Unified School District / 5,729 |
| 782. | 15.2/sq mi | Merced River Union Elementary School District / 918 |
| 783. | 15.1/sq mi | Bolinas-Stinson Union Elementary School District / 1,929 |
| 784. | 15.0/sq mi | Cuddeback Union Elementary School District / 958 |
| 785. | 15.0/sq mi | Scotia Union Elementary School District / 1,345 |
| 786. | 15.0/sq mi | West Side Union Elementary School District / 1,114 |
| 787. | 14.7/sq mi | Weed Union Elementary School District / 3,839 |
| 788. | 14.6/sq mi | Marcum-Illinois Union Elementary School District / 917 |
| 789. | 14.4/sq mi | Upper Lake Union High School District / 8,563 |
| 790. | 14.4/sq mi | Woodlake Union High School District / 12,614 |
| 791. | 13.8/sq mi | Butteville Union Elementary School District / 1,720 |
| 792. | 13.7/sq mi | Buena Vista Elementary School District / 294 |
| 793. | 13.6/sq mi | Oro Grande Elementary School District / 1,054 |
| 794. | 13.6/sq mi | Yreka Union High School District / 17,741 |
| 795. | 13.5/sq mi | Shoreline Unified School District / 5,425 |
| 796. | 13.3/sq mi | Susanville Elementary School District / 10,755 |
| 797. | 12.9/sq mi | Alview-Dairyland Union Elementary School District / 1,503 |
| 798. | 12.9/sq mi | Holtville Unified School District / 8,593 |
| 799. | 12.6/sq mi | Alexander Valley Union Elementary School District / 830 |
| 800. | 12.5/sq mi | Alta-Dutch Flat Union Elementary School District / 1,331 |
| 801. | 12.4/sq mi | Laguna Joint Elementary School District / 464 |
| 802. | 12.4/sq mi | Mariposa County Unified School District / 17,735 |
| 803. | 12.4/sq mi | Bishop Union Elementary School District / 11,908 |
| 804. | 12.2/sq mi | Geyserville Unified School District / 1,762 |
| 805. | 12.0/sq mi | Mendocino Unified School District / 5,041 |
| 806. | 12.0/sq mi | Fort Sage Unified School District / 3,178 |
| 807. | 11.9/sq mi | Bend Elementary School District / 937 |
| 808. | 11.8/sq mi | Golden Feather Union Elementary School District / 2,460 |
| 809. | 11.8/sq mi | Saucelito Elementary School District / 209 |
| 810. | 11.8/sq mi | Foresthill Union Elementary School District / 5,878 |
| 811. | 11.6/sq mi | Plaza Elementary School District / 291 |
| 812. | 11.5/sq mi | Shaffer Union Elementary School District / 9,994 |
| 813. | 11.4/sq mi | Westside Elementary School District / 1,633 |
| 814. | 11.3/sq mi | Bishop Joint Union High School District / 12,976 |
| 815. | 11.2/sq mi | Delphic Elementary School District / 81 |
| 816. | 11.2/sq mi | Arena Union Elementary School District / 2,486 |
| 817. | 11.2/sq mi | Camptonville Elementary School District / 632 |
| 818. | 11.1/sq mi | Los Molinos Unified School District / 3,508 |
| 819. | 11.0/sq mi | Graves Elementary School District / 78 |
| 820. | 10.9/sq mi | Oak Run Elementary School District / 565 |
| 821. | 10.7/sq mi | Muroc Joint Unified School District / 5,925 |
| 822. | 10.6/sq mi | Pioneer Union Elementary School District / 1,363 |
| 823. | 10.4/sq mi | Pope Valley Union Elementary School District / 1,009 |
| 824. | 10.4/sq mi | Sunol Glen Unified School District / 989 |
| 825. | 10.3/sq mi | Lassen Union High School District / 26,730 |
| 826. | 10.3/sq mi | Sierra Unified School District / 9,584 |
| 827. | 10.2/sq mi | Plainsburg Union Elementary School District / 528 |
| 828. | 10.1/sq mi | College Elementary School District / 5,872 |
| 829. | 10.0/sq mi | Lucerne Valley Unified School District / 6,427 |
| 830. | 9.9/sq mi | Southern Humboldt Joint Unified School District / 7,678 |
| 831. | 9.6/sq mi | Mount Baldy Joint Elementary School District / 276 |
| 832. | 9.4/sq mi | Union Joint Elementary School District / 74 |
| 833. | 9.2/sq mi | Buttonwillow Union Elementary School District / 1,972 |
| 834. | 9.1/sq mi | Dunsmuir Joint Union High School District / 2,364 |
| 835. | 9.1/sq mi | Plumas Unified School District / 19,131 |
| 836. | 9.0/sq mi | South Fork Union Elementary School District / 3,907 |
| 837. | 9.0/sq mi | Twain Harte-Long Barn Union Elementary School District / 6,109 |
| 838. | 9.0/sq mi | Pleasant Valley Joint Union Elementary School District / 981 |
| 839. | 8.9/sq mi | Pacific Elementary School District / 654 |
| 840. | 8.7/sq mi | Upper Lake Union Elementary School District / 4,755 |
| 841. | 8.6/sq mi | Twin Ridges Elementary School District / 2,511 |
| 842. | 8.5/sq mi | Anderson Valley Unified School District / 2,967 |
| 843. | 8.5/sq mi | Garfield Elementary School District / 379 |
| 844. | 8.4/sq mi | Mission Union Elementary School District / 301 |
| 845. | 8.4/sq mi | Point Arena Joint Union High School District / 4,733 |
| 846. | 8.0/sq mi | Summerville Union High School District / 10,316 |
| 847. | 7.8/sq mi | Santa Clara Elementary School District / 137 |
| 848. | 7.7/sq mi | Princeton Joint Unified School District / 1,239 |
| 849. | 7.6/sq mi | Mountain House Elementary School District / 212 |
| 850. | 7.5/sq mi | Big Oak Flat-Groveland Unified School District / 4,945 |
| 851. | 7.3/sq mi | Round Valley Joint Elementary School District / 1,361 |
| 852. | 7.3/sq mi | Siskiyou Union High School District / 15,637 |
| 853. | 7.2/sq mi | Lassen View Union Elementary School District / 2,655 |
| 854. | 7.0/sq mi | Willow Creek Elementary School District / 633 |
| 855. | 6.9/sq mi | Summerville Elementary School District / 4,207 |
| 856. | 6.9/sq mi | Junction City Elementary School District / 977 |
| 856. | 6.9/sq mi | Trinity Alps Unified School District in Junction City / 977 |
| 858. | 6.8/sq mi | Fall River Joint Unified School District / 7,651 |
| 859. | 6.8/sq mi | Borrego Springs Unified School District / 2,607 |
| 860. | 6.7/sq mi | Burrel Union Elementary School District / 481 |
| 861. | 6.6/sq mi | Laytonville Unified School District / 2,394 |
| 862. | 6.6/sq mi | Julian Union High School District / 4,142 |
| 863. | 6.4/sq mi | Horicon Elementary School District / 1,328 |
| 864. | 6.4/sq mi | Klamath-Trinity Joint Unified School District / 5,840 |
| 865. | 6.4/sq mi | Douglas City Elementary School District / 847 |
| 865. | 6.4/sq mi | Trinity Alps Unified School District in Douglas City / 847 |
| 867. | 6.3/sq mi | Ducor Union Elementary School District / 1,257 |
| 868. | 6.3/sq mi | Manchester Union Elementary School District / 848 |
| 869. | 6.2/sq mi | Scott Valley Unified School District / 5,119 |
| 870. | 6.2/sq mi | Raymond-Knowles Union Elementary School District / 1,229 |
| 870. | 6.2/sq mi | Yosemite Unified School District in Raymond-Knowles / 1,229 |
| 872. | 6.0/sq mi | La Grange Elementary School District / 195 |
| 873. | 6.0/sq mi | Knights Ferry Elementary School District / 553 |
| 874. | 6.0/sq mi | Mountain Union Elementary School District / 1,209 |
| 875. | 5.9/sq mi | Julian Union Elementary School District / 3,628 |
| 876. | 5.6/sq mi | Pond Union Elementary School District / 752 |
| 877. | 5.5/sq mi | Manton Joint Union Elementary School District / 402 |
| 878. | 5.5/sq mi | Feather Falls Union Elementary School District / 506 |
| 879. | 5.4/sq mi | Bogus Elementary School District / 471 |
| 880. | 5.4/sq mi | General Shafter Elementary School District / 883 |
| 881. | 5.3/sq mi | Orick Elementary School District / 300 |
| 882. | 5.3/sq mi | Maricopa Unified School District / 1,815 |
| 883. | 5.3/sq mi | Lincoln Elementary School District / 153 |
| 884. | 5.3/sq mi | Roberts Ferry Union Elementary School District / 342 |
| 885. | 5.3/sq mi | Lost Hills Union Elementary School District / 2,686 |
| 886. | 5.2/sq mi | Midway Elementary School District / 448 |
| 887. | 4.9/sq mi | Big Lagoon Union Elementary School District / 452 |
| 888. | 4.9/sq mi | Mountain Valley Unified School District / 3,069 |
| 889. | 4.8/sq mi | Tres Pinos Union Elementary School District / 798 |
| 890. | 4.7/sq mi | Elk Hills Elementary School District / 234 |
| 891. | 4.6/sq mi | Winship Elementary School District / 584 |
| 892. | 4.5/sq mi | Chawanakee Unified School District / 3,786 |
| 893. | 4.4/sq mi | Maxwell Unified School District / 1,718 |
| 894. | 4.4/sq mi | Fort Ross Elementary School District / 576 |
| 895. | 4.3/sq mi | Warner Unified School District / 1,867 |
| 896. | 4.1/sq mi | Westmorland Union Elementary School District / 2,131 |
| 897. | 4.0/sq mi | Los Olivos Elementary School District / 1,496 |
| 898. | 4.0/sq mi | Silver Valley Unified School District / 13,588 |
| 899. | 4.0/sq mi | San Antonio Union Elementary School District / 1,869 |
| 900. | 3.9/sq mi | Gazelle Union Elementary School District / 324 |
| 901. | 3.9/sq mi | Bradley Union Elementary School District / 838 |
| 902. | 3.8/sq mi | Snelling-Merced Falls Union Elementary School District / 493 |
| 903. | 3.7/sq mi | Trinity Alps Unified School District in Burnt Ranch / 786 |
| 903. | 3.7/sq mi | Burnt Ranch Elementary School District / 786 |
| 905. | 3.7/sq mi | Reeds Creek Elementary School District / 1,409 |
| 906. | 3.6/sq mi | Happy Camp Union Elementary School District / 1,296 |
| 907. | 3.6/sq mi | Blochman Union Elementary School District / 923 |
| 908. | 3.5/sq mi | Springville Union Elementary School District / 3,002 |
| 909. | 3.4/sq mi | Cienega Union Elementary School District / 243 |
| 910. | 3.4/sq mi | Round Valley Unified School District / 2,568 |
| 911. | 3.4/sq mi | Tulelake Basin Joint Unified School District / 2,506 |
| 912. | 3.4/sq mi | Semitropic Elementary School District / 350 |
| 913. | 3.3/sq mi | Westwood Unified School District / 1,701 |
| 914. | 3.3/sq mi | San Ardo Union Elementary School District / 805 |
| 915. | 3.3/sq mi | Three Rivers Union Elementary School District / 2,295 |
| 916. | 3.2/sq mi | Kneeland Elementary School District / 387 |
| 917. | 3.2/sq mi | Shandon Joint Unified School District / 1,896 |
| 918. | 3.0/sq mi | Caliente Union Elementary School District / 820 |
| 919. | 3.0/sq mi | Pacific Unified School District / 391 |
| 920. | 3.0/sq mi | Hornbrook Elementary School District / 713 |
| 921. | 2.9/sq mi | Plum Valley Elementary School District / 441 |
| 922. | 2.8/sq mi | Little Shasta Elementary School District / 447 |
| 923. | 2.8/sq mi | Pine Ridge Elementary School District / 1,042 |
| 924. | 2.7/sq mi | French Gulch-Whiskeytown Elementary School District / 529 |
| 925. | 2.6/sq mi | Mulberry Elementary School District / 138 |
| 926. | 2.5/sq mi | Modoc Joint Unified School District / 6,439 |
| 927. | 2.5/sq mi | Flournoy Union Elementary School District / 293 |
| 928. | 2.4/sq mi | Whitmore Union Elementary School District / 846 |
| 929. | 2.3/sq mi | Igo, Ono, Platina Union Elementary School District / 731 |
| 930. | 2.3/sq mi | Mattole Unified School District / 602 |
| 931. | 2.2/sq mi | Sierra-Plumas Joint Unified School District / 3,174 |
| 932. | 2.1/sq mi | Surprise Valley Joint Unified School District / 1,835 |
| 933. | 2.1/sq mi | Vista del Mar Union Elementary School District / 420 |
| 934. | 2.0/sq mi | Linns Valley-Poso Flat Union School District / 667 |
| 935. | 2.0/sq mi | McCloud Union Elementary School District / 1,332 |
| 936. | 1.9/sq mi | Trona Joint Unified School District / 1,801 |
| 937. | 1.9/sq mi | Indian Diggings Elementary School District / 118 |
| 938. | 1.9/sq mi | Trinity Alps Unified School District in Trinity Center / 413 |
| 938. | 1.9/sq mi | Trinity Center Elementary School District / 413 |
| 940. | 1.8/sq mi | Castle Rock Union Elementary School District / 341 |
| 941. | 1.8/sq mi | Willow Grove Union Elementary School District / 250 |
| 942. | 1.8/sq mi | Blake Elementary School District / 210 |
| 943. | 1.7/sq mi | Butte Valley Unified School District / 2,089 |
| 944. | 1.7/sq mi | Klamath River Union Elementary School District / 514 |
| 945. | 1.7/sq mi | San Pasqual Valley Unified School District / 2,410 |
| 946. | 1.7/sq mi | Leggett Valley Unified School District / 482 |
| 947. | 1.7/sq mi | Stony Creek Joint Unified School District / 933 |
| 948. | 1.6/sq mi | San Lucas Union Elementary School District / 301 |
| 949. | 1.6/sq mi | Alpine County Unified School District / 1,202 |
| 950. | 1.6/sq mi | Green Point Elementary School District / 170 |
| 951. | 1.6/sq mi | Bridgeville Elementary School District / 486 |
| 952. | 1.6/sq mi | Eastern Sierra Unified School District / 4,291 |
| 953. | 1.6/sq mi | Seiad Elementary School District / 321 |
| 954. | 1.5/sq mi | Cuyama Joint Unified School District / 976 |
| 955. | 1.3/sq mi | Big Pine Unified School District / 1,735 |
| 956. | 1.2/sq mi | Needles Unified School District / 6,632 |
| 957. | 1.1/sq mi | Big Valley Joint Unified School District / 1,325 |
| 958. | 1.0/sq mi | Lone Pine Unified School District / 2,502 |
| 959. | 1.0/sq mi | Jefferson Elementary School District / 173 |
| 960. | 1.0/sq mi | Southern Trinity Joint Unified School District / 846 |
| 961. | 0.9/sq mi | Belridge Elementary School District / 124 |
| 962. | 0.9/sq mi | Indian Springs Elementary School District / 155 |
| 963. | 0.8/sq mi | Silver Fork Elementary School District / 126 |
| 964. | 0.8/sq mi | Owens Valley Unified School District / 689 |
| 965. | 0.7/sq mi | McKittrick Elementary School District / 129 |
| 966. | 0.7/sq mi | Gorman Elementary School District / 111 |
| 967. | 0.7/sq mi | Elkins Elementary School District / 199 |
| 968. | 0.6/sq mi | Mineral Elementary School District / 161 |
| 969. | 0.6/sq mi | Big Creek Elementary School District / 472 |
| 970. | 0.6/sq mi | Magnolia Union Elementary School District / 112 |
| 971. | 0.5/sq mi | Hot Springs Elementary School District / 289 |
| 972. | 0.5/sq mi | Trinity Alps Unified School District in Cox Bar / 191 |
| 972. | 0.5/sq mi | Cox Bar Elementary School District / 191 |
| 974. | 0.4/sq mi | Trinity Alps Unified School District in Coffee Creek / 146 |
| 974. | 0.4/sq mi | Coffee Creek Elementary School District / 146 |
| 976. | 0.4/sq mi | Panoche Elementary School District / 134 |
| 977. | 0.4/sq mi | Scott Valley Unified School District in Forks of Salmon / 242 |
| 977. | 0.4/sq mi | Forks of Salmon Elementary School District / 242 |
| 979. | 0.3/sq mi | Bitterwater-Tully Union Elementary School District / 89 |
| 980. | 0.2/sq mi | Maple Creek Elementary School District / 36 |
| 981. | 0.2/sq mi | Baker Valley Unified School District / 969 |
| 982. | 0.2/sq mi | Desert Center Unified School District / 431 |
| 983. | 0.2/sq mi | Junction Elementary School District / 95 |
| 984. | 0.2/sq mi | Ravendale-Termo Elementary School District / 119 |
| 985. | 0.1/sq mi | Death Valley Unified School District / 471 |
Please note that we only rank locations with 'Population Density' data. The rank above might not be a complete list. Locations without 'Population Density' data are not listed.
