| Rank | Average Family Size ▼ | School District / Population |
| 1. | 4.29 | Suntex School District 10 / 40 |
| 2. | 3.95 | Woodburn School District 103 / 26,740 |
| 3. | 3.79 | Helix School District 1 / 557 |
| 4. | 3.75 | Frenchglen School District 16 / 94 |
| 5. | 3.57 | Umatilla School District 6 / 5,893 |
| 6. | 3.56 | Gervais School District 1 / 5,345 |
| 7. | 3.53 | Nyssa School District 26 / 4,891 |
| 8. | 3.52 | Jefferson County School District 509J / 15,934 |
| 9. | 3.52 | Annex School District 29 / 505 |
| 10. | 3.50 | Morrow School District 1 / 10,545 |
| 11. | 3.48 | Forest Grove School District 15 / 32,552 |
| 12. | 3.47 | Centennial School District 28J / 42,069 |
| 13. | 3.45 | Camas Valley School District 21J / 764 |
| 14. | 3.44 | Hillsboro School District 1J / 122,303 |
| 15. | 3.40 | Echo School District 5 / 871 |
| 16. | 3.39 | Silver Falls School District 4J / 19,482 |
| 17. | 3.39 | Juntura School District 12 / 84 |
| 18. | 3.38 | Stanfield School District 61 / 2,643 |
| 19. | 3.38 | Ontario School District 8 / 19,146 |
| 20. | 3.38 | Parkrose School District 3 / 26,748 |
| 21. | 3.37 | David Douglas School District 40 / 58,367 |
| 22. | 3.37 | Central Linn School District 552 / 5,499 |
| 23. | 3.36 | Reynolds School District 7 / 67,067 |
| 24. | 3.36 | Mount Angel School District 91 / 3,949 |
| 25. | 3.34 | Colton School District 53 / 4,262 |
| 26. | 3.34 | St. Paul School District 45 / 1,361 |
| 27. | 3.34 | Dayton School District 8 / 5,544 |
| 28. | 3.33 | Yamhill-Carlton School District 1 / 6,931 |
| 29. | 3.33 | Estacada School District 108 / 13,792 |
| 30. | 3.33 | Falls City School District 57 / 1,379 |
| 31. | 3.32 | Riverdale School District 51J / 2,369 |
| 32. | 3.32 | McMinnville School District 40 / 38,882 |
| 33. | 3.29 | Sheridan School District 48J / 6,956 |
| 34. | 3.28 | Hermiston School District 8 / 26,245 |
| 35. | 3.28 | Gresham-Barlow School District 1J / 73,695 |
| 36. | 3.28 | Sherwood School District 88J / 27,360 |
| 37. | 3.26 | Santiam Canyon School District 129J / 3,764 |
| 38. | 3.26 | North Marion School District 15 / 9,070 |
| 39. | 3.26 | Pine Creek School District 5 / 75 |
| 40. | 3.25 | Arlington School District 3 / 768 |
| 41. | 3.25 | Newberg School District 29J / 33,582 |
| 42. | 3.24 | Vernonia School District 47J / 4,167 |
| 43. | 3.24 | Dayville School District 16J / 423 |
| 44. | 3.24 | Alsea School District 7J / 1,211 |
| 45. | 3.24 | Canby School District 86 / 29,765 |
| 46. | 3.23 | South Harney School District 33 / 357 |
| 47. | 3.23 | Adrian School District 61 / 1,265 |
| 48. | 3.23 | Powers School District 31 / 906 |
| 49. | 3.22 | Salem-Keizer School District 24J / 238,869 |
| 50. | 3.21 | Jefferson School District 14J / 6,512 |
| 51. | 3.21 | Central School District 13J / 20,938 |
| 52. | 3.20 | Milton-Freewater School District 7 / 11,801 |
| 53. | 3.19 | North Clackamas School District 12 / 112,495 |
| 54. | 3.19 | Marcola School District 79J / 2,038 |
| 55. | 3.19 | Dufur School District 29 / 1,419 |
| 56. | 3.19 | Banks School District 13 / 6,461 |
| 57. | 3.18 | Molalla River School District 35 / 17,726 |
| 58. | 3.18 | Beaverton School District 48J / 248,747 |
| 59. | 3.17 | Eagle Point School District 9 / 25,974 |
| 60. | 3.16 | St. Helens School District 502 / 19,692 |
| 61. | 3.16 | Vale School District 84 / 4,414 |
| 62. | 3.15 | Bethel School District 52 / 36,817 |
| 63. | 3.15 | Harrisburg School District 7J / 5,471 |
| 64. | 3.15 | Wallowa School District 12 / 1,955 |
| 65. | 3.15 | Hood River County School District 1 / 21,706 |
| 66. | 3.15 | North Santiam School District 29J / 15,541 |
| 67. | 3.14 | West Linn School District 3J / 45,488 |
| 68. | 3.14 | Greater Albany School District 8J / 58,809 |
| 69. | 3.14 | Pendleton School District 16 / 21,960 |
| 70. | 3.13 | Gaston School District 511J / 3,148 |
| 71. | 3.13 | Monument School District 8 / 519 |
| 72. | 3.12 | Willamina School District 30J / 5,386 |
| 73. | 3.12 | South Umpqua School District 19 / 11,670 |
| 74. | 3.12 | Rainier School District 13 / 7,857 |
| 75. | 3.11 | Oakland School District 1 / 3,014 |
| 76. | 3.11 | Scappoose School District 1J / 14,540 |
| 77. | 3.11 | Cascade School District 5 / 13,334 |
| 78. | 3.11 | Jordan Valley School District 3 / 480 |
| 79. | 3.11 | Culver School District 4 / 3,453 |
| 80. | 3.11 | North Powder School District 8J / 735 |
| 81. | 3.10 | North Douglas School District 22 / 2,623 |
| 82. | 3.10 | Ione School District 2 / 567 |
| 83. | 3.10 | Oregon City School District 62 / 54,089 |
| 84. | 3.10 | Lebanon Community School District 9 / 28,814 |
| 85. | 3.10 | Arock School District 81 / 142 |
| 86. | 3.10 | Gladstone School District 115 / 10,595 |
| 87. | 3.10 | Springfield School District 19 / 73,589 |
| 88. | 3.09 | Dallas School District 2 / 20,237 |
| 89. | 3.09 | Tigard-Tualatin School District 23J / 76,731 |
| 90. | 3.08 | Perrydale School District 21 / 1,094 |
| 91. | 3.07 | Amity School District 4J / 3,791 |
| 92. | 3.07 | Fern Ridge School District 28J / 11,475 |
| 93. | 3.06 | South Lane School District 45J / 18,755 |
| 94. | 3.06 | Myrtle Point School District 41 / 5,182 |
| 95. | 3.06 | North Wasco School District 21 / 20,409 |
| 96. | 3.06 | Black Butte School District 41 / 315 |
| 97. | 3.05 | Grants Pass School District 7 / 35,721 |
| 98. | 3.05 | Harper School District 66 / 263 |
| 99. | 3.05 | Klamath Falls City Schools / 23,617 |
| 100. | 3.05 | Tillamook School District 9 / 13,708 |
| 101. | 3.04 | Creswell School District 40 / 8,984 |
| 102. | 3.04 | Medford School District 549 / 84,284 |
| 103. | 3.04 | Sweet Home School District 55 / 14,176 |
| 104. | 3.03 | Junction City School District 69 / 12,426 |
| 105. | 3.03 | Lake Oswego School District 7J / 39,869 |
| 106. | 3.02 | Sutherlin School District 130 / 9,364 |
| 107. | 3.02 | Pleasant Hill School District 1 / 6,221 |
| 108. | 3.02 | Oregon Trail School District 46 / 26,860 |
| 109. | 3.02 | Philomath School District 17J / 8,516 |
| 110. | 3.01 | Blachly School District 090 / 677 |
| 111. | 3.01 | La Grande School District 1 / 16,988 |
| 112. | 3.00 | Corbett School District 39 / 3,830 |
| 113. | 3.00 | Glendale School District 77 / 2,858 |
| 114. | 3.00 | Winston-Dillard School District 116 / 10,129 |
| 115. | 3.00 | Portland School District 1J / 449,014 |
| 116. | 2.99 | Huntington School District 16J / 599 |
| 117. | 2.99 | Lowell School District 71 / 2,545 |
| 118. | 2.99 | Roseburg School District 4 / 48,681 |
| 119. | 2.98 | Coos Bay School District 9 / 27,032 |
| 120. | 2.97 | Crow-Applegate-Lorane Sd 66 / 2,342 |
| 121. | 2.97 | Central Point School District 6 / 28,462 |
| 122. | 2.96 | Imbler School District 11 / 1,427 |
| 123. | 2.96 | Pilot Rock School District 2 / 2,008 |
| 124. | 2.96 | Scio School District 95 / 3,591 |
| 125. | 2.96 | Name N/A / 1,513 |
| 126. | 2.95 | Redmond School District 2J / 43,733 |
| 127. | 2.94 | North Bend School District 13 / 16,843 |
| 128. | 2.94 | Bend-La Pine Administrative School District 1 / 105,659 |
| 129. | 2.94 | Three Rivers School District / 47,570 |
| 130. | 2.94 | Harney County Union High School District 1J / 1,429 |
| 131. | 2.93 | Union School District 5 / 2,423 |
| 132. | 2.92 | Cove School District 15 / 1,491 |
| 133. | 2.92 | Corvallis School District 509J / 64,355 |
| 134. | 2.91 | Crook County School District / 21,556 |
| 135. | 2.90 | Riddle School District 70 / 2,207 |
| 136. | 2.89 | Pinehurst School District 94 / 241 |
| 137. | 2.89 | Clatskanie School District 6J / 4,957 |
| 138. | 2.89 | Baker School District 5J / 13,666 |
| 139. | 2.89 | Eugene School District 4J / 148,304 |
| 140. | 2.89 | Klamath County School District / 42,903 |
| 141. | 2.89 | Enterprise School District 21 / 2,956 |
| 142. | 2.88 | Nestucca Valley School District 101J / 4,289 |
| 143. | 2.88 | Warrenton-Hammond School District 30 / 6,056 |
| 144. | 2.88 | Sherman School District 1 / 1,819 |
| 145. | 2.88 | Rogue River School District 35 / 10,228 |
| 146. | 2.87 | Elkton School District 34 / 1,408 |
| 147. | 2.86 | Oakridge School District 76 / 4,418 |
| 148. | 2.86 | Mitchell School District 55 / 383 |
| 149. | 2.85 | Elgin School District 23 / 2,353 |
| 150. | 2.85 | Reedsport School District 105 / 5,586 |
| 151. | 2.85 | Monroe School District 1J / 3,106 |
| 152. | 2.83 | Knappa School District 4 / 2,676 |
| 153. | 2.83 | Lincoln County School District / 46,062 |
| 154. | 2.83 | Plush School District 18 / 145 |
| 154. | 2.83 | Coquille School District 8 / 6,774 |
| 156. | 2.83 | Butte Falls School District 91 / 1,186 |
| 157. | 2.83 | Phoenix-Talent School District 4 / 23,942 |
| 158. | 2.82 | Athena-Weston School District 29J / 2,630 |
| 159. | 2.82 | Jewell School District 8 / 1,065 |
| 160. | 2.82 | Seaside School District 10 / 11,882 |
| 161. | 2.81 | Days Creek School District 15 / 1,180 |
| 162. | 2.81 | North Lake School District 14 / 1,389 |
| 163. | 2.81 | Sisters School District 6 / 7,665 |
| 164. | 2.79 | Ashwood School District 8 / 180 |
| 165. | 2.79 | Joseph School District 6 / 1,967 |
| 166. | 2.78 | Central Curry School District 1 / 5,147 |
| 167. | 2.78 | Fossil School District 21J / 754 |
| 168. | 2.77 | Ashland School District 5 / 24,115 |
| 169. | 2.77 | Spray School District 1 / 436 |
| 170. | 2.77 | Glide School District 12 / 5,180 |
| 171. | 2.77 | Harney County School District 4 / 602 |
| 172. | 2.74 | Yoncalla School District 32 / 2,489 |
| 173. | 2.74 | Pine-Eagle School District 61 / 1,571 |
| 174. | 2.73 | Astoria School District 1 / 14,286 |
| 175. | 2.72 | Mapleton School District 32 / 1,343 |
| 176. | 2.69 | John Day School District 3 / 4,733 |
| 177. | 2.68 | Brookings-Harbor School District 17 / 14,155 |
| 178. | 2.64 | McKenzie School District 68 / 1,990 |
| 179. | 2.61 | Port Orford-Langlois School District 2J / 3,490 |
| 180. | 2.60 | Harney County School District 3 / 5,935 |
| 181. | 2.60 | Ukiah School District 80 / 196 |
| 182. | 2.59 | South Wasco County School District 1 / 1,964 |
| 183. | 2.59 | Bandon School District 54 / 6,201 |
| 184. | 2.59 | Diamond School District 7 / 160 |
| 185. | 2.58 | Lakeview School District 7 / 5,686 |
| 186. | 2.56 | Prospect School District 59 / 1,036 |
| 187. | 2.55 | Siuslaw School District 97J / 14,354 |
| 188. | 2.55 | Drewsey School District 13 / 95 |
| 189. | 2.54 | Paisley School District 11 / 604 |
| 190. | 2.53 | Long Creek School District 17 / 436 |
| 191. | 2.51 | Neah-Kah-Nie School District 56 / 7,203 |
| 192. | 2.42 | Prairie City School District 4 / 1,251 |
| 193. | 2.40 | Condon School District 25J / 963 |
| 194. | 2.38 | McDermitt School District 51 / 66 |
| 195. | 2.34 | Burnt River School District 30J / 340 |
| 196. | 2.29 | Adel School District 21 / 58 |
| 197. | 2.07 | Troy School District 54 / 41 |
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.
