| Rank | Average Family Size ▼ | School District / Population |
| 1. | 4.00 | Suntex School District 10 / 28 |
| 2. | 3.86 | Helix School District 1 / 531 |
| 3. | 3.72 | Woodburn School District 103 / 25,563 |
| 4. | 3.64 | Powers School District 31 / 937 |
| 5. | 3.63 | Falls City School District 57 / 1,530 |
| 6. | 3.61 | Ione School District 2 / 695 |
| 7. | 3.59 | Gervais School District 1 / 5,053 |
| 8. | 3.57 | Forest Grove School District 15 / 33,138 |
| 9. | 3.57 | Oakland School District 1 / 3,289 |
| 10. | 3.56 | Central School District 13J / 21,982 |
| 11. | 3.55 | Camas Valley School District 21J / 869 |
| 12. | 3.54 | Morrow School District 1 / 10,736 |
| 13. | 3.54 | Perrydale School District 21 / 1,270 |
| 14. | 3.52 | Colton School District 53 / 4,491 |
| 15. | 3.48 | Sheridan School District 48J / 6,894 |
| 16. | 3.47 | Hillsboro School District 1J / 122,782 |
| 17. | 3.46 | Centennial School District 28J / 40,040 |
| 18. | 3.45 | Mount Angel School District 91 / 4,138 |
| 19. | 3.42 | Silver Falls School District 4J / 19,345 |
| 20. | 3.42 | Dallas School District 2 / 21,538 |
| 21. | 3.42 | David Douglas School District 40 / 56,440 |
| 22. | 3.41 | Ontario School District 8 / 18,517 |
| 23. | 3.41 | Nyssa School District 26 / 4,541 |
| 24. | 3.41 | Banks School District 13 / 6,878 |
| 25. | 3.40 | Reynolds School District 7 / 67,173 |
| 26. | 3.40 | Sherwood School District 88J / 26,234 |
| 27. | 3.40 | Umatilla School District 6 / 5,445 |
| 28. | 3.39 | Parkrose School District 3 / 27,205 |
| 29. | 3.39 | Willamina School District 30J / 5,243 |
| 30. | 3.39 | Santiam Canyon School District 129J / 3,891 |
| 31. | 3.38 | Yamhill-Carlton School District 1 / 6,671 |
| 32. | 3.37 | St. Paul School District 45 / 1,430 |
| 33. | 3.37 | Annex School District 29 / 509 |
| 34. | 3.37 | Dayton School District 8 / 5,266 |
| 35. | 3.36 | Stanfield School District 61 / 2,442 |
| 36. | 3.35 | Jordan Valley School District 3 / 521 |
| 37. | 3.34 | Estacada School District 108 / 13,580 |
| 38. | 3.33 | Vale School District 84 / 4,880 |
| 39. | 3.32 | Harper School District 66 / 297 |
| 40. | 3.32 | North Clackamas School District 12 / 113,718 |
| 41. | 3.31 | Riverdale School District 51J / 2,969 |
| 42. | 3.30 | Frenchglen School District 16 / 97 |
| 43. | 3.30 | Canby School District 86 / 30,260 |
| 44. | 3.30 | McMinnville School District 40 / 38,233 |
| 45. | 3.29 | Vernonia School District 47J / 4,094 |
| 46. | 3.29 | North Marion School District 15 / 8,701 |
| 47. | 3.28 | Oregon City School District 62 / 54,882 |
| 48. | 3.28 | Gresham-Barlow School District 1J / 73,297 |
| 49. | 3.28 | Bethel School District 52 / 35,986 |
| 50. | 3.28 | Gaston School District 511J / 2,973 |
| 51. | 3.28 | Jefferson County School District 509J / 14,982 |
| 52. | 3.27 | Beaverton School District 48J / 247,490 |
| 53. | 3.26 | Molalla River School District 35 / 17,713 |
| 54. | 3.26 | Echo School District 5 / 1,073 |
| 55. | 3.26 | Salem-Keizer School District 24J / 239,373 |
| 56. | 3.26 | St. Helens School District 502 / 19,481 |
| 57. | 3.24 | Newberg School District 29J / 33,790 |
| 58. | 3.24 | Oregon Trail School District 46 / 27,318 |
| 59. | 3.23 | Eagle Point School District 9 / 25,926 |
| 60. | 3.23 | Marcola School District 79J / 2,130 |
| 61. | 3.23 | Dayville School District 16J / 404 |
| 62. | 3.23 | Imbler School District 11 / 1,418 |
| 63. | 3.22 | South Lane School District 45J / 18,309 |
| 64. | 3.21 | Cascade School District 5 / 13,495 |
| 65. | 3.20 | Gladstone School District 115 / 10,727 |
| 66. | 3.20 | Tigard-Tualatin School District 23J / 79,356 |
| 67. | 3.20 | Central Linn School District 552 / 4,906 |
| 68. | 3.20 | Jefferson School District 14J / 6,262 |
| 69. | 3.19 | Dufur School District 29 / 1,627 |
| 70. | 3.19 | Blachly School District 090 / 690 |
| 71. | 3.19 | Harrisburg School District 7J / 5,363 |
| 72. | 3.18 | West Linn School District 3J / 47,489 |
| 73. | 3.18 | Milton-Freewater School District 7 / 11,219 |
| 74. | 3.17 | Corbett School District 39 / 5,071 |
| 75. | 3.16 | North Douglas School District 22 / 2,596 |
| 76. | 3.16 | Scappoose School District 1J / 14,545 |
| 77. | 3.15 | Hood River County School District 1 / 21,316 |
| 78. | 3.15 | Greater Albany School District 8J / 57,852 |
| 79. | 3.15 | North Santiam School District 29J / 15,185 |
| 80. | 3.14 | North Wasco School District 21 / 19,510 |
| 81. | 3.14 | Cove School District 15 / 1,393 |
| 82. | 3.14 | Winston-Dillard School District 116 / 10,122 |
| 83. | 3.14 | Crow-Applegate-Lorane Sd 66 / 2,480 |
| 84. | 3.14 | Sweet Home School District 55 / 14,357 |
| 85. | 3.13 | Adel School District 21 / 54 |
| 86. | 3.12 | Hermiston School District 8 / 25,386 |
| 87. | 3.12 | Fern Ridge School District 28J / 11,561 |
| 88. | 3.12 | Junction City School District 69 / 12,776 |
| 89. | 3.12 | Amity School District 4J / 3,689 |
| 90. | 3.12 | Klamath Falls City Schools / 19,797 |
| 91. | 3.11 | Springfield School District 19 / 71,865 |
| 92. | 3.11 | Lake Oswego School District 7J / 40,900 |
| 93. | 3.11 | Pinehurst School District 94 / 223 |
| 94. | 3.11 | La Grande School District 1 / 16,538 |
| 95. | 3.11 | Arock School District 81 / 65 |
| 96. | 3.11 | Alsea School District 7J / 1,304 |
| 97. | 3.11 | Union School District 5 / 2,455 |
| 98. | 3.10 | Scio School District 95 / 3,418 |
| 99. | 3.10 | Medford School District 549 / 82,295 |
| 100. | 3.09 | Creswell School District 40 / 9,076 |
| 101. | 3.09 | South Umpqua School District 19 / 11,435 |
| 102. | 3.09 | Lowell School District 71 / 2,250 |
| 103. | 3.08 | Lebanon Community School District 9 / 28,376 |
| 104. | 3.08 | Adrian School District 61 / 1,307 |
| 105. | 3.07 | Clatskanie School District 6J / 5,543 |
| 106. | 3.06 | Grants Pass School District 7 / 35,248 |
| 107. | 3.06 | Plush School District 18 / 121 |
| 108. | 3.06 | Pleasant Hill School District 1 / 6,625 |
| 109. | 3.06 | Glendale School District 77 / 2,799 |
| 110. | 3.06 | Tillamook School District 9 / 13,565 |
| 111. | 3.05 | North Powder School District 8J / 654 |
| 112. | 3.05 | Name N/A / 21,268 |
| 112. | 3.05 | Name N/A / 21,268 |
| 114. | 3.05 | Crook County School District / 22,483 |
| 115. | 3.05 | Pendleton School District 16 / 21,726 |
| 116. | 3.04 | Name N/A / 22,681 |
| 117. | 3.04 | Nestucca Valley School District 101J / 4,345 |
| 118. | 3.03 | Rainier School District 13 / 7,676 |
| 119. | 3.03 | Portland School District 1J / 436,001 |
| 120. | 3.03 | Sutherlin School District 130 / 8,742 |
| 121. | 3.01 | Lincoln County School District / 46,083 |
| 122. | 3.00 | Knappa School District 4 / 3,159 |
| 123. | 2.99 | Redmond School District 2J / 42,467 |
| 124. | 2.99 | Coquille School District 8 / 7,281 |
| 125. | 2.98 | Central Point School District 6 / 27,576 |
| 126. | 2.97 | Pilot Rock School District 2 / 2,117 |
| 127. | 2.96 | Juntura School District 12 / 97 |
| 128. | 2.96 | Bend-La Pine Administrative School District 1 / 104,559 |
| 129. | 2.96 | Coos Bay School District 9 / 26,973 |
| 130. | 2.96 | Eugene School District 4J / 146,888 |
| 131. | 2.96 | Elgin School District 23 / 2,422 |
| 132. | 2.96 | Roseburg School District 4 / 45,855 |
| 133. | 2.95 | Harney County School District 4 / 655 |
| 134. | 2.94 | Oakridge School District 76 / 4,307 |
| 135. | 2.93 | Butte Falls School District 91 / 1,192 |
| 136. | 2.92 | Klamath County School District / 25,105 |
| 137. | 2.92 | Warrenton-Hammond School District 30 / 5,821 |
| 138. | 2.91 | South Harney School District 33 / 253 |
| 139. | 2.91 | Elkton School District 34 / 1,339 |
| 140. | 2.91 | North Bend School District 13 / 16,107 |
| 141. | 2.90 | Rogue River School District 35 / 10,045 |
| 142. | 2.90 | Riddle School District 70 / 2,062 |
| 143. | 2.90 | Huntington School District 16J / 590 |
| 144. | 2.89 | Mapleton School District 32 / 1,502 |
| 145. | 2.89 | Myrtle Point School District 41 / 5,038 |
| 146. | 2.89 | Corvallis School District 509J / 61,509 |
| 147. | 2.88 | Three Rivers School District / 46,601 |
| 148. | 2.87 | Wallowa School District 12 / 1,885 |
| 149. | 2.87 | Glide School District 12 / 5,046 |
| 150. | 2.86 | Arlington School District 3 / 727 |
| 151. | 2.86 | Jewell School District 8 / 1,004 |
| 152. | 2.86 | Harney County Union High School District 1J / 1,316 |
| 153. | 2.85 | Astoria School District 1 / 14,348 |
| 154. | 2.85 | Culver School District 4 / 3,353 |
| 155. | 2.83 | Monroe School District 1J / 3,078 |
| 156. | 2.82 | Philomath School District 17J / 8,464 |
| 157. | 2.82 | Ashland School District 5 / 24,918 |
| 158. | 2.82 | Sisters School District 6 / 6,906 |
| 159. | 2.81 | Days Creek School District 15 / 1,132 |
| 160. | 2.81 | Phoenix-Talent School District 4 / 23,681 |
| 161. | 2.78 | McKenzie School District 68 / 2,183 |
| 162. | 2.78 | Baker School District 5J / 13,362 |
| 163. | 2.78 | Seaside School District 10 / 11,627 |
| 164. | 2.77 | North Lake School District 14 / 1,326 |
| 165. | 2.75 | Monument School District 8 / 421 |
| 166. | 2.74 | Bandon School District 54 / 6,525 |
| 167. | 2.73 | Paisley School District 11 / 628 |
| 168. | 2.72 | Prospect School District 59 / 1,003 |
| 169. | 2.72 | Athena-Weston School District 29J / 2,783 |
| 170. | 2.70 | Yoncalla School District 32 / 2,381 |
| 171. | 2.69 | Pine-Eagle School District 61 / 1,688 |
| 172. | 2.68 | Enterprise School District 21 / 2,902 |
| 173. | 2.68 | Mitchell School District 55 / 330 |
| 174. | 2.67 | Reedsport School District 105 / 5,614 |
| 175. | 2.64 | Sherman School District 1 / 1,779 |
| 176. | 2.62 | Pine Creek School District 5 / 68 |
| 177. | 2.60 | Central Curry School District 1 / 4,868 |
| 178. | 2.58 | Joseph School District 6 / 1,994 |
| 179. | 2.58 | Siuslaw School District 97J / 14,288 |
| 180. | 2.56 | Black Butte School District 41 / 276 |
| 181. | 2.55 | Brookings-Harbor School District 17 / 13,754 |
| 182. | 2.54 | John Day School District 3 / 4,370 |
| 183. | 2.53 | Harney County School District 3 / 5,461 |
| 184. | 2.52 | McDermitt School District 51 / 57 |
| 185. | 2.51 | South Wasco County School District 1 / 1,928 |
| 186. | 2.51 | Burnt River School District 30J / 412 |
| 187. | 2.51 | Diamond School District 7 / 135 |
| 188. | 2.50 | Neah-Kah-Nie School District 56 / 7,004 |
| 189. | 2.48 | Port Orford-Langlois School District 2J / 3,300 |
| 190. | 2.48 | Spray School District 1 / 372 |
| 191. | 2.47 | Long Creek School District 17 / 482 |
| 192. | 2.45 | Lakeview School District 7 / 5,031 |
| 193. | 2.45 | Ukiah School District 80 / 183 |
| 194. | 2.43 | Prairie City School District 4 / 1,266 |
| 195. | 2.36 | Troy School District 54 / 47 |
| 196. | 2.30 | Condon School District 25J / 870 |
| 197. | 2.26 | Fossil School District 21J / 618 |
| 198. | 2.22 | Drewsey School District 13 / 71 |
| 199. | 2.20 | Ashwood School District 8 / 90 |
Please note that we only rank locations with 'Average Family Size' data. The rank above might not be a complete list. Locations without 'Average Family Size' data are not listed.
*ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.
