| Rank | Average Family Size ▼ | School District / Population |
| 1. | 3.72 | Woodburn School District 103 / 27,070 |
| 2. | 3.71 | Gervais School District 1 / 6,397 |
| 3. | 3.57 | Nyssa School District 26 / 5,039 |
| 4. | 3.47 | Umatilla School District 6 / 6,368 |
| 5. | 3.46 | Mount Angel School District 91 / 4,063 |
| 6. | 3.39 | Forest Grove School District 15 / 34,131 |
| 7. | 3.34 | David Douglas School District 40 / 63,567 |
| 8. | 3.33 | Pine Creek School District 5 / 52 |
| 8. | 3.33 | Jefferson County School District 509J / 16,028 |
| 10. | 3.32 | Stanfield School District 61 / 2,515 |
| 10. | 3.32 | Dayton School District 8 / 5,340 |
| 12. | 3.31 | St. Paul School District 45 / 1,315 |
| 13. | 3.30 | Centennial School District 28J / 41,431 |
| 13. | 3.30 | North Marion School District 15 / 10,123 |
| 15. | 3.27 | Morrow School District 1 / 10,541 |
| 15. | 3.27 | Diamond School District 7 / 91 |
| 17. | 3.26 | Hermiston School District 8 / 26,789 |
| 18. | 3.25 | Banks School District 13 / 6,119 |
| 18. | 3.25 | Hillsboro School District 1J / 125,462 |
| 18. | 3.25 | Sherwood School District 88J / 29,224 |
| 21. | 3.24 | Reynolds School District 7 / 71,796 |
| 21. | 3.24 | Ontario School District 8 / 18,590 |
| 23. | 3.22 | Milton-Freewater School District 7 / 11,750 |
| 24. | 3.20 | Central School District 13J / 21,561 |
| 24. | 3.20 | Echo School District 5 / 991 |
| 24. | 3.20 | Silver Falls School District 4J / 19,162 |
| 27. | 3.18 | Parkrose School District 3 / 26,438 |
| 27. | 3.18 | Helix School District 1 / 432 |
| 29. | 3.17 | Juntura School District 12 / 119 |
| 30. | 3.16 | Molalla River School District 35 / 19,142 |
| 30. | 3.16 | Riverdale School District 51J / 2,831 |
| 30. | 3.16 | Salem-Keizer School District 24J / 242,521 |
| 33. | 3.14 | Colton School District 53 / 4,189 |
| 33. | 3.14 | Vale School District 84 / 4,840 |
| 33. | 3.14 | Hood River County School District 1 / 22,346 |
| 33. | 3.14 | McMinnville School District 40 / 39,623 |
| 37. | 3.13 | Gresham-Barlow School District 1J / 76,354 |
| 37. | 3.13 | Drewsey School District 13 / 124 |
| 39. | 3.12 | Harrisburg School District 7J / 5,131 |
| 39. | 3.12 | Sheridan School District 48J / 7,430 |
| 41. | 3.11 | Amity School District 4J / 4,392 |
| 42. | 3.09 | Scio School District 95 / 3,954 |
| 42. | 3.09 | Beaverton School District 48J / 255,082 |
| 42. | 3.09 | Willamina School District 30J / 6,114 |
| 42. | 3.09 | Jefferson School District 14J / 6,289 |
| 42. | 3.09 | Gaston School District 511J / 2,939 |
| 42. | 3.09 | Frenchglen School District 16 / 82 |
| 48. | 3.08 | Central Linn School District 552 / 5,265 |
| 48. | 3.08 | Estacada School District 108 / 12,938 |
| 48. | 3.08 | Canby School District 86 / 30,183 |
| 51. | 3.07 | Newberg School District 29J / 33,940 |
| 51. | 3.07 | Cascade School District 5 / 13,675 |
| 53. | 3.06 | West Linn School District 3J / 45,262 |
| 54. | 3.05 | Yamhill-Carlton School District 1 / 6,748 |
| 54. | 3.05 | North Clackamas School District 12 / 113,237 |
| 54. | 3.05 | North Santiam School District 29J / 15,824 |
| 54. | 3.05 | Camas Valley School District 21J / 813 |
| 58. | 3.03 | Oregon City School District 62 / 54,748 |
| 58. | 3.03 | Falls City School District 57 / 1,227 |
| 58. | 3.03 | Eagle Point School District 9 / 27,686 |
| 58. | 3.03 | St. Helens School District 502 / 20,637 |
| 62. | 3.02 | Bethel School District 52 / 37,957 |
| 62. | 3.02 | Tigard-Tualatin School District 23J / 78,274 |
| 64. | 3.01 | Lebanon Community School District 9 / 28,794 |
| 64. | 3.01 | North Powder School District 8J / 776 |
| 64. | 3.01 | Gladstone School District 115 / 11,022 |
| 67. | 3.00 | Pendleton School District 16 / 22,021 |
| 67. | 3.00 | Harper School District 66 / 287 |
| 67. | 3.00 | Sweet Home School District 55 / 14,649 |
| 67. | 3.00 | Greater Albany School District 8J / 60,802 |
| 67. | 3.00 | Corbett School District 39 / 3,832 |
| 67. | 3.00 | Double O School District 28 / 27 |
| 67. | 3.00 | Vernonia School District 47J / 3,776 |
| 74. | 2.99 | Oregon Trail School District 46 / 28,463 |
| 74. | 2.99 | Adrian School District 61 / 1,252 |
| 74. | 2.99 | Philomath School District 17J / 8,659 |
| 77. | 2.98 | North Wasco School District 21 / 20,509 |
| 78. | 2.97 | Dufur School District 29 / 1,668 |
| 78. | 2.97 | Dallas School District 2 / 20,376 |
| 78. | 2.97 | Medford School District 549 / 84,505 |
| 78. | 2.97 | Ione School District 2 / 644 |
| 82. | 2.96 | Springfield School District 19 / 73,859 |
| 83. | 2.95 | Rainier School District 13 / 7,405 |
| 83. | 2.95 | Central Point School District 6 / 29,667 |
| 83. | 2.95 | Culver School District 4 / 3,502 |
| 86. | 2.94 | Klamath Falls City Schools / 23,596 |
| 86. | 2.94 | Tillamook School District 9 / 13,284 |
| 86. | 2.94 | Creswell School District 40 / 9,018 |
| 86. | 2.94 | Pilot Rock School District 2 / 2,057 |
| 86. | 2.94 | South Lane School District 45J / 18,770 |
| 91. | 2.93 | Grants Pass School District 7 / 36,336 |
| 91. | 2.93 | South Harney School District 33 / 165 |
| 91. | 2.93 | Annex School District 29 / 430 |
| 91. | 2.93 | Monroe School District 1J / 3,149 |
| 91. | 2.93 | Jewell School District 8 / 1,015 |
| 96. | 2.92 | Harney County Union High School District 1J / 1,429 |
| 96. | 2.92 | Suntex School District 10 / 85 |
| 96. | 2.92 | Perrydale School District 21 / 973 |
| 96. | 2.92 | Monument School District 8 / 435 |
| 100. | 2.91 | La Grande School District 1 / 16,990 |
| 100. | 2.91 | Lake Oswego School District 7J / 40,616 |
| 100. | 2.91 | Fern Ridge School District 28J / 11,954 |
| 100. | 2.91 | Clatskanie School District 6J / 5,049 |
| 100. | 2.91 | Redmond School District 2J / 45,507 |
| 100. | 2.91 | Knappa School District 4 / 3,241 |
| 106. | 2.90 | Scappoose School District 1J / 14,486 |
| 106. | 2.90 | Athena-Weston School District 29J / 2,722 |
| 106. | 2.90 | Santiam Canyon School District 129J / 4,008 |
| 106. | 2.90 | Warrenton-Hammond School District 30 / 6,128 |
| 106. | 2.90 | Union School District 5 / 2,523 |
| 106. | 2.90 | Junction City School District 69 / 12,525 |
| 112. | 2.89 | Astoria School District 1 / 13,648 |
| 112. | 2.89 | Portland School District 1J / 459,982 |
| 114. | 2.88 | Lowell School District 71 / 2,558 |
| 114. | 2.88 | Arlington School District 3 / 807 |
| 116. | 2.87 | Pinehurst School District 94 / 214 |
| 116. | 2.87 | North Douglas School District 22 / 2,662 |
| 116. | 2.87 | Cove School District 15 / 1,538 |
| 116. | 2.87 | Butte Falls School District 91 / 1,204 |
| 116. | 2.87 | Pleasant Hill School District 1 / 6,500 |
| 116. | 2.87 | Bend-La Pine Administrative School District 1 / 107,386 |
| 122. | 2.86 | Klamath County School District / 42,784 |
| 122. | 2.86 | South Umpqua School District 19 / 12,372 |
| 122. | 2.86 | Winston-Dillard School District 116 / 10,313 |
| 122. | 2.86 | Blachly School District 090 / 609 |
| 126. | 2.85 | Sutherlin School District 130 / 9,579 |
| 126. | 2.85 | Riddle School District 70 / 2,439 |
| 126. | 2.85 | Imbler School District 11 / 1,381 |
| 129. | 2.84 | Crook County School District / 21,037 |
| 129. | 2.84 | Crow-Applegate-Lorane Sd 66 / 2,320 |
| 129. | 2.84 | Sherman School District 1 / 1,765 |
| 129. | 2.84 | Roseburg School District 4 / 46,695 |
| 129. | 2.84 | Alsea School District 7J / 1,021 |
| 134. | 2.82 | Corvallis School District 509J / 65,449 |
| 135. | 2.81 | Marcola School District 79J / 1,897 |
| 135. | 2.81 | Wallowa School District 12 / 1,792 |
| 135. | 2.81 | Coquille School District 8 / 7,005 |
| 135. | 2.81 | Arock School District 81 / 146 |
| 135. | 2.81 | Coos Bay School District 9 / 27,065 |
| 135. | 2.81 | Myrtle Point School District 41 / 5,069 |
| 141. | 2.80 | Glendale School District 77 / 2,981 |
| 141. | 2.80 | Oakland School District 1 / 3,068 |
| 141. | 2.80 | Harney County School District 4 / 803 |
| 141. | 2.80 | Eugene School District 4J / 150,188 |
| 141. | 2.80 | Phoenix-Talent School District 4 / 24,064 |
| 141. | 2.80 | Huntington School District 16J / 539 |
| 141. | 2.80 | Baker School District 5J / 13,509 |
| 148. | 2.79 | Powers School District 31 / 832 |
| 149. | 2.78 | Yoncalla School District 32 / 2,675 |
| 149. | 2.78 | North Lake School District 14 / 1,998 |
| 149. | 2.78 | Harney County School District 3 / 5,993 |
| 149. | 2.78 | Oakridge School District 76 / 4,474 |
| 153. | 2.77 | Seaside School District 10 / 12,343 |
| 153. | 2.77 | Jordan Valley School District 3 / 431 |
| 153. | 2.77 | Sisters School District 6 / 7,596 |
| 156. | 2.76 | Elgin School District 23 / 2,628 |
| 156. | 2.76 | North Bend School District 13 / 16,046 |
| 156. | 2.76 | Fossil School District 21J / 693 |
| 159. | 2.75 | Long Creek School District 17 / 397 |
| 160. | 2.74 | Three Rivers School District / 47,713 |
| 161. | 2.73 | Enterprise School District 21 / 3,047 |
| 162. | 2.72 | Mitchell School District 55 / 370 |
| 162. | 2.72 | Lakeview School District 7 / 5,215 |
| 164. | 2.71 | Adel School District 21 / 97 |
| 164. | 2.71 | Nestucca Valley School District 101J / 4,310 |
| 164. | 2.71 | Rogue River School District 35 / 9,283 |
| 167. | 2.70 | Lincoln County School District / 46,192 |
| 167. | 2.70 | Days Creek School District 15 / 1,214 |
| 169. | 2.69 | John Day School District 3 / 5,037 |
| 169. | 2.69 | Brookings-Harbor School District 17 / 13,983 |
| 171. | 2.67 | Glide School District 12 / 5,741 |
| 172. | 2.66 | Ashland School District 5 / 24,282 |
| 173. | 2.65 | Reedsport School District 105 / 5,789 |
| 173. | 2.65 | McKenzie School District 68 / 2,265 |
| 175. | 2.64 | Paisley School District 11 / 495 |
| 175. | 2.64 | Burnt River School District 30J / 394 |
| 177. | 2.63 | Elkton School District 34 / 1,294 |
| 177. | 2.63 | Condon School District 25J / 1,061 |
| 179. | 2.62 | Mapleton School District 32 / 1,599 |
| 179. | 2.62 | Prairie City School District 4 / 1,209 |
| 179. | 2.62 | Bandon School District 54 / 6,478 |
| 182. | 2.61 | Dayville School District 16J / 376 |
| 183. | 2.60 | South Wasco County School District 1 / 2,079 |
| 183. | 2.60 | Prospect School District 59 / 965 |
| 185. | 2.59 | Neah-Kah-Nie School District 56 / 7,654 |
| 186. | 2.58 | Pine-Eagle School District 61 / 1,681 |
| 187. | 2.57 | Joseph School District 6 / 2,129 |
| 187. | 2.57 | Spray School District 1 / 367 |
| 189. | 2.56 | Ashwood School District 8 / 59 |
| 190. | 2.55 | Ukiah School District 80 / 244 |
| 191. | 2.52 | Central Curry School District 1 / 5,356 |
| 192. | 2.51 | Port Orford-Langlois School District 2J / 3,573 |
| 193. | 2.49 | Siuslaw School District 97J / 14,672 |
| 194. | 2.47 | McDermitt School District 51 / 102 |
| 195. | 2.44 | Plush School District 18 / 90 |
| 196. | 2.43 | Black Butte School District 41 / 266 |
| 197. | 2.30 | Troy School District 54 / 40 |
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.
