| Rank | Average Family Size ▼ | School District / Population |
| 1. | 5.06 | Wahluke School District / 8,345 |
| 2. | 4.54 | Toppenish School District / 15,652 |
| 3. | 4.52 | Mabton School District / 3,283 |
| 4. | 4.50 | Royal School District / 6,709 |
| 5. | 4.45 | Granger School District / 5,943 |
| 6. | 4.38 | Taholah School District / 899 |
| 7. | 4.36 | Nespelem School District / 1,120 |
| 8. | 4.35 | Grandview School District / 15,786 |
| 9. | 4.26 | Wapato School District / 13,779 |
| 10. | 4.24 | Benge School District / 118 |
| 11. | 4.20 | Mount Adams School District / 4,045 |
| 12. | 4.20 | Sunnyside School District / 25,306 |
| 13. | 4.13 | Queets-Clearwater School District / 789 |
| 14. | 4.07 | Prescott School District / 1,564 |
| 15. | 4.05 | Warden School District / 4,068 |
| 16. | 4.04 | Pasco School District / 73,998 |
| 17. | 4.02 | North Franklin School District / 10,061 |
| 18. | 4.02 | Othello School District / 14,769 |
| 19. | 3.96 | Quincy School District / 12,473 |
| 20. | 3.88 | Green Mountain School District / 1,057 |
| 21. | 3.87 | North River School District / 307 |
| 22. | 3.87 | Brewster School District / 4,498 |
| 23. | 3.82 | Paterson School District / 352 |
| 24. | 3.81 | Highland School District / 5,388 |
| 25. | 3.76 | Star School District / 79 |
| 26. | 3.75 | Bridgeport School District / 3,324 |
| 27. | 3.75 | Prosser School District / 14,382 |
| 28. | 3.70 | Zillah School District / 5,293 |
| 29. | 3.69 | Orondo School District / 1,547 |
| 30. | 3.68 | Nooksack Valley School District / 11,244 |
| 31. | 3.67 | Yakima School District / 78,730 |
| 32. | 3.66 | Finley School District / 5,006 |
| 33. | 3.66 | Tukwila School District / 18,514 |
| 34. | 3.65 | Mill A School District / 498 |
| 35. | 3.63 | Klickitat School District / 747 |
| 36. | 3.61 | Roosevelt School District / 217 |
| 37. | 3.61 | Union Gap School District / 3,708 |
| 38. | 3.57 | Cape Flattery School District / 2,855 |
| 39. | 3.57 | Shelton School District / 23,526 |
| 40. | 3.55 | Oakville School District / 2,558 |
| 41. | 3.54 | Summit Valley School District / 603 |
| 42. | 3.52 | Bickleton School District / 461 |
| 43. | 3.52 | Battle Ground School District / 67,123 |
| 44. | 3.50 | Highline School District / 128,065 |
| 45. | 3.47 | Monroe School District / 39,271 |
| 46. | 3.47 | Mount Vernon School District / 38,393 |
| 47. | 3.47 | Hockinson School District / 8,872 |
| 48. | 3.46 | Lamont School District / 191 |
| 49. | 3.45 | Kent School District / 163,185 |
| 50. | 3.45 | Kennewick School District / 88,498 |
| 51. | 3.44 | McCleary School District / 3,014 |
| 52. | 3.44 | Wenatchee School District / 43,416 |
| 53. | 3.44 | Lake Stevens School District / 41,019 |
| 54. | 3.44 | Bethel School District / 103,634 |
| 55. | 3.44 | Camas School District / 29,911 |
| 56. | 3.43 | Elma School District / 8,572 |
| 57. | 3.43 | Mary Walker School District / 3,060 |
| 58. | 3.43 | Manson School District / 3,340 |
| 59. | 3.42 | Mukilteo School District / 96,423 |
| 60. | 3.41 | Sultan School District / 13,382 |
| 61. | 3.41 | Aberdeen School District / 19,905 |
| 62. | 3.40 | Moses Lake School District / 40,936 |
| 63. | 3.40 | Orchard Prairie School District / 760 |
| 64. | 3.40 | Fife Public Schools / 21,518 |
| 65. | 3.39 | Clover Park School District / 81,580 |
| 66. | 3.39 | Granite Falls School District / 13,740 |
| 67. | 3.39 | Orting School District / 13,762 |
| 68. | 3.38 | Keller School District / 430 |
| 69. | 3.38 | Inchelium School District / 1,183 |
| 70. | 3.38 | Cashmere School District / 8,343 |
| 71. | 3.38 | Evergreen School District (Clark) / 144,158 |
| 72. | 3.38 | Federal Way School District / 134,509 |
| 73. | 3.37 | Dieringer School District / 10,109 |
| 74. | 3.37 | Franklin Pierce School District / 51,245 |
| 75. | 3.36 | Auburn School District / 86,733 |
| 76. | 3.35 | Touchet School District / 1,126 |
| 77. | 3.35 | Yelm Community Schools / 30,223 |
| 78. | 3.35 | Kahlotus School District / 283 |
| 79. | 3.35 | Lake Chelan School District / 7,582 |
| 80. | 3.34 | Winlock School District / 5,296 |
| 81. | 3.34 | Arlington School District / 30,700 |
| 82. | 3.34 | White Salmon Valley School District / 7,396 |
| 83. | 3.34 | Centralia School District / 22,421 |
| 84. | 3.34 | Carbonado School District / 732 |
| 85. | 3.33 | Palisades School District / 366 |
| 86. | 3.33 | Toutle Lake School District / 3,160 |
| 87. | 3.32 | Tacoma Public Schools / 212,381 |
| 88. | 3.32 | Rochester School District / 14,715 |
| 89. | 3.32 | Marysville School District / 71,032 |
| 90. | 3.32 | Snohomish School District / 52,659 |
| 91. | 3.32 | Tahoma School District / 39,802 |
| 92. | 3.32 | Sumner School District / 43,664 |
| 93. | 3.32 | Reardan-Edwall School District / 4,909 |
| 94. | 3.32 | Ephrata School District / 11,355 |
| 95. | 3.32 | Centerville School District / 922 |
| 96. | 3.31 | White River School District / 21,088 |
| 97. | 3.31 | Hoquiam School District / 10,827 |
| 98. | 3.31 | Waterville School District / 2,362 |
| 99. | 3.30 | Renton School District / 118,608 |
| 100. | 3.30 | Washougal School District / 20,325 |
| 101. | 3.30 | Everett School District / 134,180 |
| 102. | 3.28 | Puyallup School District / 121,755 |
| 103. | 3.28 | East Valley School District (Yakima) / 15,061 |
| 104. | 3.28 | Kelso School District / 28,516 |
| 105. | 3.27 | Pe Ell School District / 1,811 |
| 106. | 3.27 | Lynden School District / 18,355 |
| 107. | 3.25 | Chehalis School District / 15,339 |
| 108. | 3.25 | Coulee-Hartline School District / 1,579 |
| 109. | 3.25 | Walla Walla School District / 38,110 |
| 110. | 3.24 | Woodland School District / 10,908 |
| 111. | 3.24 | Columbia School District / 3,466 |
| 112. | 3.24 | Lakewood School District / 13,903 |
| 113. | 3.23 | Deer Park School District / 10,436 |
| 114. | 3.23 | College Place School District / 13,500 |
| 115. | 3.22 | La Center School District / 8,523 |
| 116. | 3.22 | Wellpinit School District / 999 |
| 117. | 3.22 | Mount Baker School District / 15,423 |
| 118. | 3.22 | Ferndale School District / 30,515 |
| 119. | 3.21 | Selah School District / 18,117 |
| 120. | 3.21 | Nine Mile Falls School District / 9,594 |
| 121. | 3.20 | Edmonds School District / 159,316 |
| 122. | 3.20 | Issaquah School District / 105,010 |
| 123. | 3.20 | Raymond School District / 4,031 |
| 124. | 3.20 | Northshore School District / 128,593 |
| 125. | 3.20 | Central Kitsap School District / 70,396 |
| 126. | 3.20 | Trout Lake School District / 876 |
| 127. | 3.19 | Vancouver Public Schools / 145,307 |
| 128. | 3.19 | Central Valley School District / 77,908 |
| 129. | 3.18 | Glenwood School District / 484 |
| 130. | 3.18 | Burlington-Edison School District / 20,510 |
| 131. | 3.17 | Mead School District / 51,622 |
| 132. | 3.17 | Ridgefield School District / 14,498 |
| 133. | 3.17 | Kiona-Benton School District / 8,106 |
| 134. | 3.17 | Richland School District / 65,458 |
| 135. | 3.17 | Pioneer School District / 10,416 |
| 136. | 3.17 | Eastmont School District / 29,976 |
| 137. | 3.17 | East Valley School District (Spokane) / 26,463 |
| 138. | 3.16 | North Thurston Public Schools / 97,287 |
| 139. | 3.16 | Snoqualmie Valley School District / 36,121 |
| 140. | 3.16 | Boistfort School District / 1,022 |
| 141. | 3.16 | Eatonville School District / 10,930 |
| 142. | 3.15 | Riverview School District / 19,629 |
| 143. | 3.15 | Kalama School District / 6,850 |
| 144. | 3.15 | Castle Rock School District / 10,377 |
| 145. | 3.15 | Lind School District / 985 |
| 146. | 3.15 | Darrington School District / 3,279 |
| 147. | 3.14 | Bremerton School District / 45,904 |
| 148. | 3.14 | South Kitsap School District / 66,259 |
| 149. | 3.14 | Longview Public Schools / 44,887 |
| 150. | 3.14 | Sedro-Woolley School District / 26,417 |
| 151. | 3.13 | Davenport School District / 2,970 |
| 152. | 3.13 | Shoreline School District / 67,123 |
| 153. | 3.13 | West Valley School District / 28,705 |
| 154. | 3.12 | Medical Lake School District / 11,325 |
| 155. | 3.12 | Dixie School District / 478 |
| 156. | 3.12 | Great Northern School District / 968 |
| 157. | 3.12 | Stevenson-Carson School District / 5,976 |
| 158. | 3.11 | Kittitas School District / 4,058 |
| 159. | 3.11 | Enumclaw School District / 25,760 |
| 160. | 3.11 | Steilacoom Historical School District / 20,969 |
| 161. | 3.11 | Satsop School District / 583 |
| 162. | 3.11 | Adna School District / 3,445 |
| 163. | 3.11 | Peninsula School District / 62,980 |
| 164. | 3.10 | Southside School District / 2,210 |
| 165. | 3.09 | University Place School District / 29,934 |
| 166. | 3.09 | Lake Washington School District / 186,310 |
| 167. | 3.09 | Skamania School District / 785 |
| 168. | 3.09 | Meridian School District / 9,030 |
| 169. | 3.09 | Spokane Public Schools / 221,617 |
| 170. | 3.09 | Mary M. Knight School District / 1,639 |
| 171. | 3.08 | Colfax School District / 4,185 |
| 172. | 3.08 | Port Angeles School District / 30,792 |
| 173. | 3.08 | Ritzville School District / 2,611 |
| 174. | 3.08 | Napavine School District / 4,279 |
| 175. | 3.07 | Naches Valley School District / 8,394 |
| 176. | 3.07 | Concrete School District / 4,949 |
| 177. | 3.06 | Bellevue School District / 128,388 |
| 178. | 3.05 | Wilson Creek School District / 461 |
| 179. | 3.05 | Olympia School District / 62,892 |
| 180. | 3.05 | Tonasket School District / 7,573 |
| 181. | 3.04 | Lake Quinault School District / 1,145 |
| 182. | 3.04 | West Valley School District / 19,374 |
| 183. | 3.03 | Oak Harbor School District / 37,644 |
| 184. | 3.03 | North Kitsap School District / 47,616 |
| 185. | 3.03 | Palouse School District / 1,422 |
| 186. | 3.03 | Grapeview School District / 2,626 |
| 187. | 3.02 | Rainier School District / 4,955 |
| 188. | 3.02 | Mercer Island School District / 23,636 |
| 189. | 3.02 | Wishkah Valley School District / 879 |
| 190. | 3.02 | Oakesdale School District / 900 |
| 191. | 3.02 | Pateros School District / 1,430 |
| 192. | 3.01 | Okanogan School District / 5,556 |
| 193. | 3.01 | Montesano School District / 8,426 |
| 194. | 3.01 | Tenino School District / 9,808 |
| 195. | 3.01 | Seattle School District / 638,610 |
| 196. | 3.01 | Mount Pleasant School District / 377 |
| 197. | 3.01 | Ellensburg School District / 26,774 |
| 198. | 3.01 | Cheney School District / 34,461 |
| 199. | 3.00 | Tumwater School District / 37,970 |
| 200. | 3.00 | Clarkston School District / 18,858 |
| 201. | 3.00 | Hood Canal School District / 5,509 |
| 202. | 3.00 | Grand Coulee Dam School District / 4,753 |
| 203. | 2.99 | Bellingham School District / 103,698 |
| 204. | 2.99 | Omak School District / 10,412 |
| 205. | 2.99 | Stanwood-Camano School District / 32,457 |
| 206. | 2.98 | La Conner School District / 4,631 |
| 207. | 2.98 | Freeman School District / 4,013 |
| 208. | 2.98 | Pomeroy School District / 2,168 |
| 209. | 2.98 | Toledo School District / 4,146 |
| 210. | 2.98 | Cosmopolis School District / 1,867 |
| 211. | 2.97 | Naselle-Grays River Valley School District / 2,412 |
| 212. | 2.97 | Conway School District / 2,969 |
| 213. | 2.97 | Damman School District / 756 |
| 214. | 2.97 | Quillayute Valley School District / 6,383 |
| 215. | 2.97 | Liberty School District / 4,450 |
| 216. | 2.97 | Onalaska School District / 5,103 |
| 217. | 2.97 | Chewelah School District / 6,111 |
| 218. | 2.96 | Entiat School District / 2,379 |
| 219. | 2.96 | Bainbridge Island School District / 23,206 |
| 220. | 2.95 | Evaline School District / 647 |
| 221. | 2.95 | Colton School District / 1,198 |
| 222. | 2.95 | Riverside School District / 11,129 |
| 223. | 2.95 | Pullman School District / 32,763 |
| 224. | 2.94 | Blaine School District / 16,491 |
| 225. | 2.94 | Orient School District / 997 |
| 226. | 2.93 | Waitsburg School District / 1,295 |
| 227. | 2.93 | North Mason School District / 14,521 |
| 228. | 2.92 | Selkirk School District / 2,224 |
| 229. | 2.92 | Cascade School District / 8,854 |
| 230. | 2.91 | Wilbur School District / 1,237 |
| 231. | 2.90 | Columbia School District / 1,171 |
| 232. | 2.90 | Thorp School District / 1,422 |
| 233. | 2.90 | South Bend School District / 2,446 |
| 234. | 2.89 | Republic School District / 3,751 |
| 235. | 2.89 | Colville School District / 11,398 |
| 236. | 2.89 | Dayton School District / 3,837 |
| 237. | 2.89 | Asotin-Anatone School District / 3,169 |
| 238. | 2.89 | Curlew School District / 1,268 |
| 239. | 2.88 | Griffin School District / 6,347 |
| 240. | 2.88 | Willapa Valley School District / 2,300 |
| 241. | 2.88 | Vashon Island School District / 10,447 |
| 242. | 2.88 | Mossyrock School District / 4,049 |
| 243. | 2.88 | St. John School District / 1,108 |
| 244. | 2.88 | Rosalia School District / 1,115 |
| 245. | 2.87 | Cusick School District / 1,842 |
| 246. | 2.87 | Harrington School District / 620 |
| 247. | 2.86 | Tekoa School District / 1,040 |
| 248. | 2.86 | Crescent School District / 2,720 |
| 249. | 2.85 | Goldendale School District / 6,966 |
| 250. | 2.84 | Cle Elum-Roslyn School District / 7,728 |
| 251. | 2.84 | Lyle School District / 2,549 |
| 252. | 2.84 | Ocosta School District / 7,250 |
| 253. | 2.84 | Valley School District / 1,360 |
| 254. | 2.83 | Wishram School District / 424 |
| 255. | 2.83 | Northport School District / 1,581 |
| 256. | 2.83 | Kettle Falls School District / 5,479 |
| 257. | 2.82 | Easton School District / 954 |
| 258. | 2.82 | Soap Lake School District / 3,285 |
| 259. | 2.82 | Port Townsend School District / 14,284 |
| 260. | 2.81 | Oroville School District / 3,998 |
| 261. | 2.79 | Newport School District / 8,238 |
| 262. | 2.79 | Ocean Beach School District / 9,571 |
| 263. | 2.78 | Almira School District / 441 |
| 264. | 2.78 | Anacortes School District / 20,359 |
| 265. | 2.75 | Wahkiakum School District / 2,894 |
| 266. | 2.74 | Odessa School District / 1,431 |
| 267. | 2.74 | Mansfield School District / 560 |
| 268. | 2.72 | Brinnon School District / 1,263 |
| 269. | 2.72 | Chimacum School District / 11,424 |
| 270. | 2.71 | South Whidbey School District / 15,586 |
| 271. | 2.70 | Sequim School District / 29,833 |
| 272. | 2.69 | Endicott School District / 497 |
| 273. | 2.68 | Washtucna School District / 374 |
| 274. | 2.66 | Sprague School District / 697 |
| 275. | 2.65 | Steptoe School District / 313 |
| 276. | 2.64 | White Pass School District / 3,671 |
| 277. | 2.64 | San Juan Island School District / 7,771 |
| 278. | 2.64 | Shaw Island School District / 221 |
| 279. | 2.63 | Coupeville School District / 10,520 |
| 280. | 2.61 | Garfield School District / 632 |
| 281. | 2.61 | North Beach School District / 7,055 |
| 282. | 2.60 | Morton School District / 2,556 |
| 283. | 2.59 | Quilcene School District / 1,659 |
| 284. | 2.57 | Onion Creek School District / 378 |
| 285. | 2.57 | Methow Valley School District / 4,979 |
| 286. | 2.57 | Creston School District / 1,058 |
| 287. | 2.55 | Index School District / 608 |
| 288. | 2.55 | Loon Lake School District / 1,649 |
| 289. | 2.51 | Orcas Island School District / 5,251 |
| 290. | 2.50 | Evergreen School District (Stevens) / 429 |
| 291. | 2.47 | LaCrosse School District / 668 |
| 292. | 2.43 | Lopez School District / 2,604 |
| 293. | 2.34 | Skykomish School District / 430 |
| 294. | 2.27 | Starbuck School District / 131 |
| 295. | 2.00 | Stehekin School District / 7 |
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.
