| Rank | Average Family Size ▼ | School District / Population |
| 1. | 6.69 | Pryor Elementary School District / 961 |
| 1. | 6.69 | Plenty Coups High School District / 961 |
| 3. | 6.17 | Ross Elementary School District / 44 |
| 4. | 5.85 | Liberty Elementary School District / 76 |
| 5. | 5.52 | Brockton Elementary School District / 922 |
| 5. | 5.52 | Brockton High School District / 922 |
| 7. | 5.50 | Gildford Colony Elementary School District / 110 |
| 8. | 5.43 | Auchard Creek Elementary School District / 143 |
| 9. | 5.16 | Lame Deer Elementary School District / 3,168 |
| 10. | 4.86 | Lodge Grass Elementary School District / 1,921 |
| 11. | 4.63 | Lodge Grass High School District / 2,319 |
| 12. | 4.54 | Lame Deer High School District / 5,339 |
| 13. | 4.25 | Wolf Point Elementary School District / 3,715 |
| 14. | 4.23 | Wolf Point High School District / 4,281 |
| 15. | 4.20 | Poplar High School District / 3,329 |
| 15. | 4.20 | Poplar Elementary School District / 3,329 |
| 17. | 4.18 | Hardin High School District / 8,013 |
| 18. | 4.18 | Hardin Elementary School District / 8,993 |
| 19. | 4.10 | Frontier Elementary School District / 566 |
| 20. | 4.07 | Browning Elementary School District / 8,110 |
| 21. | 4.05 | Browning High School District / 8,960 |
| 22. | 4.05 | Heart Butte K-12 Schools / 826 |
| 23. | 4.00 | Molt Elementary School District / 184 |
| 24. | 3.99 | Valley View Elementary School District / 427 |
| 25. | 3.92 | Dixon Elementary School District / 634 |
| 26. | 3.91 | Rocky Boy Elementary School District / 2,389 |
| 27. | 3.87 | Rocky Boy High School District / 1,498 |
| 28. | 3.87 | Smith Valley Elementary School District / 1,761 |
| 29. | 3.86 | East Glacier Park Elementary School District / 850 |
| 30. | 3.81 | Evergreen Elementary School District / 5,740 |
| 31. | 3.81 | Whitewater K-12 Schools / 143 |
| 32. | 3.78 | Ringling Elementary School District / 94 |
| 33. | 3.77 | Boulder Elementary School District / 2,428 |
| 34. | 3.76 | Big Timber Elementary School District / 2,819 |
| 35. | 3.73 | Columbia Falls Elementary School District / 13,994 |
| 36. | 3.73 | Olney-Bissell Elementary School District / 927 |
| 37. | 3.73 | Drummond Elementary School District / 948 |
| 38. | 3.73 | Cardwell Elementary School District / 481 |
| 38. | 3.73 | North Harlem Colony Elementary School District / 41 |
| 40. | 3.72 | Harlem Elementary School District / 2,676 |
| 41. | 3.72 | Columbia Falls High School District / 14,405 |
| 42. | 3.71 | Morin Elementary School District / 533 |
| 43. | 3.71 | Ronan Elementary School District / 8,304 |
| 43. | 3.71 | Ronan High School District / 8,304 |
| 45. | 3.71 | Kila Elementary School District / 1,231 |
| 46. | 3.71 | Swan River Elementary School District / 1,685 |
| 47. | 3.70 | Melstone High School District / 424 |
| 48. | 3.70 | Basin Elementary School District / 264 |
| 49. | 3.69 | Corvallis K-12 Schools / 7,291 |
| 50. | 3.69 | Pleasant Valley Elementary School District / 103 |
| 51. | 3.69 | Harlem High School District / 2,771 |
| 52. | 3.68 | Wyola Elementary School District / 398 |
| 53. | 3.68 | Drummond High School District / 1,207 |
| 54. | 3.67 | Helena Flats Elementary School District / 1,534 |
| 55. | 3.67 | Harrison K-12 Schools / 927 |
| 56. | 3.64 | Ashland Elementary School District / 1,156 |
| 57. | 3.63 | Arlee High School District / 2,377 |
| 57. | 3.63 | Arlee Elementary School District / 2,377 |
| 59. | 3.61 | Townsend K-12 Schools / 4,335 |
| 60. | 3.58 | Kalispell Elementary School District / 28,562 |
| 61. | 3.57 | Bainville K-12 Schools / 335 |
| 62. | 3.55 | Sweet Grass County High School District / 3,567 |
| 63. | 3.54 | Montana City Elementary School District / 2,543 |
| 64. | 3.53 | Springdale Elementary School District / 165 |
| 65. | 3.51 | Lavina K-12 Schools / 532 |
| 66. | 3.50 | Flathead High School District / 52,794 |
| 67. | 3.50 | Garrison Elementary School District / 146 |
| 67. | 3.50 | Hall Elementary School District / 259 |
| 69. | 3.48 | Luther Elementary School District / 441 |
| 70. | 3.47 | Creston Elementary School District / 1,060 |
| 71. | 3.47 | Lone Rock Elementary School District / 3,252 |
| 72. | 3.47 | Jefferson High School District / 7,804 |
| 73. | 3.45 | Melstone Elementary School District / 619 |
| 74. | 3.45 | Florence-Carlton K-12 Schools / 5,688 |
| 75. | 3.44 | Potomac Elementary School District / 1,138 |
| 76. | 3.44 | Noxon Elementary School District / 1,313 |
| 77. | 3.43 | Stevensville High School District / 9,879 |
| 78. | 3.43 | West Valley Elementary School District / 2,822 |
| 79. | 3.43 | Helmville Elementary School District / 230 |
| 80. | 3.43 | Chester-Joplin-Inverness High School District / 2,290 |
| 81. | 3.43 | Culbertson High School District / 921 |
| 82. | 3.42 | Charlo High School District / 1,976 |
| 83. | 3.42 | Sunset Elementary School District / 174 |
| 84. | 3.42 | Melville Elementary School District / 242 |
| 85. | 3.41 | Stevensville Elementary School District / 6,627 |
| 86. | 3.40 | Fair-Mont-Egan Elementary School District / 1,130 |
| 87. | 3.39 | Whitehall High School District / 3,725 |
| 88. | 3.39 | Chester-Joplin-Inverness Elementary School District / 2,185 |
| 89. | 3.38 | St. Ignatius K-12 Schools / 3,138 |
| 90. | 3.38 | Box Elder High School District / 335 |
| 90. | 3.38 | Box Elder Elementary School District / 335 |
| 92. | 3.38 | Paradise Elementary School District / 392 |
| 93. | 3.35 | Whitehall Elementary School District / 3,168 |
| 94. | 3.35 | Park City High School District / 2,065 |
| 95. | 3.35 | Lolo Elementary School District / 3,934 |
| 96. | 3.35 | Eureka Elementary School District / 4,157 |
| 97. | 3.34 | Shepherd High School District / 2,920 |
| 97. | 3.34 | Shepherd Elementary School District / 2,920 |
| 99. | 3.34 | Big Sandy High School District / 2,034 |
| 100. | 3.34 | East Helena Elementary School District / 8,387 |
| 101. | 3.34 | Hot Springs Elementary School District / 1,419 |
| 102. | 3.33 | Lockwood Elementary School District / 7,389 |
| 103. | 3.33 | Dupuyer Elementary School District / 309 |
| 104. | 3.32 | Reichle Elementary School District / 116 |
| 105. | 3.32 | Frazer Elementary School District / 424 |
| 106. | 3.32 | Manhattan Elementary School District / 2,523 |
| 107. | 3.32 | Park City Elementary School District / 2,206 |
| 108. | 3.32 | Van Norman Elementary School District / 108 |
| 109. | 3.32 | Bonner Elementary School District / 2,365 |
| 110. | 3.31 | Culbertson Elementary School District / 1,019 |
| 111. | 3.31 | Grant Elementary School District / 113 |
| 112. | 3.31 | Seeley Lake Elementary School District / 1,614 |
| 113. | 3.31 | Absarokee Elementary School District / 1,841 |
| 114. | 3.31 | Frenchtown K-12 Schools / 5,970 |
| 115. | 3.30 | Winnett K-12 Schools / 512 |
| 116. | 3.30 | Independent Elementary School District / 2,555 |
| 117. | 3.30 | Hamilton K-12 Schools / 11,767 |
| 118. | 3.29 | Hays-Lodge Pole K-12 Schools / 1,016 |
| 119. | 3.29 | Hot Springs High School District / 1,668 |
| 120. | 3.29 | Bigfork High School District / 7,893 |
| 121. | 3.28 | Cayuse Prairie Elementary School District / 2,511 |
| 122. | 3.28 | Power Elementary School District / 520 |
| 123. | 3.27 | Frazer High School District / 586 |
| 124. | 3.27 | Blue Creek Elementary School District / 2,190 |
| 125. | 3.27 | Power High School District / 525 |
| 126. | 3.27 | Belgrade Elementary School District / 19,573 |
| 127. | 3.26 | Trail Creek Elementary School District / 64 |
| 128. | 3.26 | Elliston Elementary School District / 291 |
| 129. | 3.26 | Manhattan High School District / 3,940 |
| 130. | 3.25 | Belgrade High School District / 19,773 |
| 131. | 3.25 | Whitefish High School District / 14,617 |
| 132. | 3.25 | Roy K-12 Schools / 348 |
| 133. | 3.25 | Columbus Elementary School District / 3,352 |
| 134. | 3.24 | Twin Bridges K-12 Schools / 1,351 |
| 135. | 3.24 | Charlo Elementary School District / 1,342 |
| 136. | 3.24 | Rapelje High School District / 351 |
| 137. | 3.24 | Victor K-12 Schools / 3,644 |
| 138. | 3.24 | Greycliff Elementary School District / 284 |
| 139. | 3.24 | Broadview High School District / 937 |
| 140. | 3.23 | Hysham K-12 Schools / 912 |
| 141. | 3.23 | Columbus High School District / 3,493 |
| 142. | 3.22 | Whitefish Elementary School District / 14,029 |
| 143. | 3.22 | Clancy Elementary School District / 2,569 |
| 144. | 3.22 | Helena Elementary School District / 48,201 |
| 145. | 3.21 | Helena High School District / 58,464 |
| 146. | 3.21 | Denton High School District / 671 |
| 146. | 3.21 | Denton Elementary School District / 664 |
| 148. | 3.21 | Bigfork Elementary School District / 6,078 |
| 149. | 3.21 | Sunburst K-12 Schools / 1,300 |
| 150. | 3.20 | Anderson Elementary School District / 1,129 |
| 151. | 3.20 | Target Range Elementary School District / 3,277 |
| 152. | 3.20 | Avon Elementary School District / 177 |
| 153. | 3.20 | Name N/A / 842 |
| 154. | 3.20 | Broadview Elementary School District / 871 |
| 155. | 3.19 | Hellgate Elementary School District / 10,647 |
| 156. | 3.19 | Amsterdam Elementary School District / 1,390 |
| 157. | 3.19 | Belt High School District / 2,020 |
| 158. | 3.19 | Havre Elementary School District / 12,764 |
| 159. | 3.18 | Greenfield Elementary School District / 598 |
| 160. | 3.18 | Pendroy Elementary School District / 334 |
| 161. | 3.18 | Geraldine Elementary School District / 652 |
| 162. | 3.18 | North Star High School District / 1,214 |
| 163. | 3.18 | Havre High School District / 13,197 |
| 164. | 3.18 | Lincoln County High School District / 5,421 |
| 165. | 3.18 | Rau Elementary School District / 271 |
| 166. | 3.18 | Geraldine High School District / 713 |
| 167. | 3.17 | Belt Elementary School District / 2,043 |
| 168. | 3.16 | Name N/A / 852,731 |
| 169. | 3.16 | Judith Gap Elementary School District / 302 |
| 169. | 3.16 | Judith Gap High School District / 302 |
| 171. | 3.16 | Deep Creek Elementary School District / 149 |
| 172. | 3.16 | Missoula High School District / 97,049 |
| 173. | 3.15 | Laurel Elementary School District / 10,532 |
| 174. | 3.15 | Absarokee High School District / 2,256 |
| 175. | 3.15 | Gallatin Gateway Elementary School District / 1,489 |
| 176. | 3.15 | Billings High School District / 122,509 |
| 177. | 3.15 | Lambert High School District / 384 |
| 178. | 3.15 | Cut Bank High School District / 4,451 |
| 178. | 3.15 | Cut Bank Elementary School District / 4,451 |
| 180. | 3.14 | Marion Elementary School District / 840 |
| 181. | 3.14 | Sun River Valley Elementary School District / 2,060 |
| 182. | 3.14 | Lustre Elementary School District / 162 |
| 183. | 3.14 | South Stacey Elementary School District / 113 |
| 184. | 3.14 | Woodman Elementary School District / 580 |
| 185. | 3.13 | Missoula Elementary School District / 70,583 |
| 186. | 3.13 | Simms High School District / 3,100 |
| 187. | 3.13 | Billings Elementary School District / 104,681 |
| 188. | 3.12 | Vaughn Elementary School District / 1,040 |
| 189. | 3.11 | Monforton Elementary School District / 1,807 |
| 190. | 3.11 | Laurel High School District / 10,015 |
| 191. | 3.11 | King Colony Elementary School District / 140 |
| 192. | 3.11 | Superior K-12 Schools / 2,370 |
| 193. | 3.11 | Malmborg Elementary School District / 133 |
| 194. | 3.11 | Lambert Elementary School District / 407 |
| 195. | 3.11 | Plains High School District / 3,352 |
| 196. | 3.10 | Great Falls Elementary School District / 72,584 |
| 197. | 3.10 | Great Falls High School District / 72,659 |
| 198. | 3.10 | Cottonwood Elementary School District / 236 |
| 199. | 3.09 | Camas Prairie Elementary School District / 249 |
| 200. | 3.08 | Joliet High School District / 2,178 |
| 201. | 3.08 | Plains Elementary School District / 2,960 |
| 202. | 3.07 | Pioneer Elementary School District / 792 |
| 203. | 3.07 | White Sulphur Springs High School District / 1,628 |
| 204. | 3.07 | Fairfield High School District / 1,888 |
| 205. | 3.07 | Elder Grove Elementary School District / 2,053 |
| 206. | 3.07 | Reedpoint High School District / 501 |
| 207. | 3.06 | Gold Creek Elementary School District / 221 |
| 208. | 3.06 | Philipsburg K-12 Schools / 1,673 |
| 209. | 3.06 | Canyon Creek Elementary School District / 1,807 |
| 210. | 3.06 | Shields Valley Elementary School District / 1,731 |
| 210. | 3.06 | Shields Valley High School District / 1,731 |
| 212. | 3.05 | Carter Elementary School District / 143 |
| 213. | 3.05 | Fairfield Elementary School District / 1,115 |
| 214. | 3.05 | Dillon Elementary School District / 7,428 |
| 215. | 3.05 | White Sulphur Springs Elementary School District / 1,482 |
| 216. | 3.04 | Ulm Elementary School District / 753 |
| 217. | 3.04 | Hinsdale High School District / 418 |
| 218. | 3.04 | Valier High School District / 1,417 |
| 219. | 3.03 | Knees Elementary School District / 108 |
| 220. | 3.03 | North Star Elementary School District / 1,082 |
| 221. | 3.03 | Noxon High School District / 2,229 |
| 222. | 3.03 | Clinton Elementary School District / 1,666 |
| 223. | 3.03 | Wolf Creek Elementary School District / 407 |
| 224. | 3.03 | Livingston Elementary School District / 10,306 |
| 225. | 3.02 | Lincoln K-12 Schools / 978 |
| 226. | 3.02 | Sheridan Elementary School District / 1,783 |
| 227. | 3.01 | Bozeman High School District / 58,563 |
| 228. | 3.01 | Park High School District / 12,686 |
| 229. | 3.01 | Hinsdale Elementary School District / 382 |
| 230. | 3.01 | Beaverhead County High School District / 8,478 |
| 231. | 3.01 | Highwood Elementary School District / 540 |
| 232. | 3.00 | Centerville Elementary School District / 1,526 |
| 233. | 3.00 | Bozeman Elementary School District / 51,961 |
| 234. | 3.00 | Centerville High School District / 1,474 |
| 234. | 3.00 | Pine Grove Elementary School District / 100 |
| 236. | 2.99 | Highwood High School District / 482 |
| 237. | 2.99 | Arrowhead Elementary School District / 1,852 |
| 238. | 2.99 | Harlowton Elementary School District / 1,669 |
| 239. | 2.98 | Fromberg K-12 Schools / 1,105 |
| 240. | 2.98 | Kircher Elementary School District / 728 |
| 241. | 2.98 | Westby K-12 Schools / 358 |
| 242. | 2.98 | West Yellowstone K-12 School District / 1,493 |
| 243. | 2.98 | Dodson Elementary School District / 276 |
| 244. | 2.97 | Somers Elementary School District / 4,396 |
| 245. | 2.96 | Harlowton High School District / 1,772 |
| 246. | 2.96 | Augusta High School District / 639 |
| 247. | 2.96 | Huntley Project K-12 Schools / 3,750 |
| 248. | 2.96 | Twin Buttes Elementary School District / 83 |
| 249. | 2.96 | Valier Elementary School District / 1,108 |
| 250. | 2.96 | Sheridan High School District / 2,075 |
| 251. | 2.95 | Cottonwood Elementary School District / 356 |
| 252. | 2.95 | Alberton K-12 Schools / 1,100 |
| 253. | 2.95 | Deer Park Elementary School District / 765 |
| 254. | 2.95 | St. Regis K-12 Schools / 1,055 |
| 255. | 2.95 | Roberts K-12 Schools / 688 |
| 256. | 2.95 | De Smet Elementary School District / 580 |
| 257. | 2.95 | Miami Elementary School District / 112 |
| 258. | 2.95 | Big Sandy Elementary School District / 1,121 |
| 259. | 2.95 | Chinook Elementary School District / 2,022 |
| 260. | 2.94 | Shelby Elementary School District / 3,521 |
| 261. | 2.94 | Butte Elementary School District / 31,449 |
| 262. | 2.94 | West Glacier Elementary School District / 411 |
| 263. | 2.94 | Vida Elementary School District / 534 |
| 264. | 2.94 | Butte High School District / 32,714 |
| 265. | 2.94 | Reedpoint Elementary School District / 549 |
| 266. | 2.94 | Ramsay Elementary School District / 1,040 |
| 267. | 2.93 | McCormick Elementary School District / 344 |
| 268. | 2.93 | Winifred K-12 Schools / 489 |
| 269. | 2.92 | Fergus High School District / 8,858 |
| 270. | 2.92 | Ophir Elementary School District / 1,074 |
| 271. | 2.92 | Lewistown Elementary School District / 8,714 |
| 272. | 2.92 | Davey Elementary School District / 99 |
| 273. | 2.92 | Garfield County High School District / 1,135 |
| 274. | 2.91 | Cascade High School District / 2,659 |
| 275. | 2.91 | Colstrip Elementary School District / 2,351 |
| 275. | 2.91 | Colstrip High School District / 2,351 |
| 277. | 2.91 | Jordan Elementary School District / 640 |
| 278. | 2.91 | La Motte Elementary School District / 734 |
| 279. | 2.90 | Ennis K-12 Schools / 2,563 |
| 280. | 2.90 | Lindsay Elementary School District / 387 |
| 281. | 2.90 | Rapelje Elementary School District / 233 |
| 282. | 2.89 | Shelby High School District / 3,810 |
| 283. | 2.89 | Dodson High School District / 331 |
| 284. | 2.88 | Divide Elementary School District / 138 |
| 285. | 2.88 | Chinook High School District / 2,407 |
| 286. | 2.88 | Pass Creek Elementary School District / 82 |
| 287. | 2.87 | Roundup High School District / 3,958 |
| 288. | 2.87 | Forsyth Elementary School District / 2,497 |
| 289. | 2.87 | Fishtail Elementary School District / 366 |
| 290. | 2.87 | Roundup Elementary School District / 3,797 |
| 291. | 2.87 | Forsyth High School District / 2,531 |
| 292. | 2.86 | Powell County High School District / 7,151 |
| 293. | 2.86 | Joliet Elementary School District / 1,624 |
| 294. | 2.86 | Opheim K-12 Schools / 415 |
| 295. | 2.85 | Fortine Elementary School District / 604 |
| 296. | 2.85 | Savage High School District / 520 |
| 297. | 2.85 | Choteau High School District / 3,107 |
| 298. | 2.85 | Three Forks Elementary School District / 2,639 |
| 299. | 2.84 | Three Forks High School District / 2,592 |
| 300. | 2.84 | Biddle Elementary School District / 70 |
| 301. | 2.84 | Polson High School District / 10,702 |
| 302. | 2.84 | Bridger K-12 Schools / 1,205 |
| 303. | 2.83 | Cascade Elementary School District / 1,757 |
| 304. | 2.83 | Custer K-12 Schools / 400 |
| 305. | 2.83 | Red Lodge High School District / 4,012 |
| 306. | 2.82 | Elysian Elementary School District / 488 |
| 307. | 2.82 | Golden Ridge Elementary School District / 180 |
| 308. | 2.82 | Circle High School District / 1,747 |
| 309. | 2.82 | Belfry K-12 Schools / 553 |
| 310. | 2.81 | Glasgow K-12 Schools / 4,534 |
| 311. | 2.81 | Choteau Elementary School District / 2,612 |
| 312. | 2.81 | Nashua K-12 Schools / 935 |
| 313. | 2.81 | Libby K-12 Schools / 10,055 |
| 314. | 2.81 | Baker K-12 Schools / 2,302 |
| 315. | 2.81 | Polson Elementary School District / 9,518 |
| 316. | 2.80 | Deer Lodge Elementary School District / 5,878 |
| 317. | 2.80 | Broadus Elementary School District / 1,363 |
| 318. | 2.79 | Darby K-12 Schools / 3,077 |
| 319. | 2.79 | Powder River County High School District / 1,691 |
| 320. | 2.79 | Troy Elementary School District / 2,612 |
| 321. | 2.77 | Circle Elementary School District / 1,213 |
| 322. | 2.76 | Upper West Shore Elementary School District / 757 |
| 323. | 2.76 | Savage Elementary School District / 499 |
| 324. | 2.76 | Custer County High School District / 11,129 |
| 325. | 2.76 | Red Lodge Elementary School District / 3,445 |
| 326. | 2.75 | Miles City Elementary School District / 9,488 |
| 327. | 2.75 | Troy High School District / 3,222 |
| 328. | 2.75 | Wibaux K-12 Schools / 922 |
| 329. | 2.75 | Warrick Elementary School District / 22 |
| 329. | 2.75 | Dutton/Brady K-12 Schools / 945 |
| 331. | 2.75 | Trinity Elementary School District / 1,242 |
| 332. | 2.74 | Fort Benton High School District / 1,994 |
| 333. | 2.74 | Grass Range Elementary School District / 405 |
| 334. | 2.74 | Medicine Lake K-12 Schools / 723 |
| 335. | 2.73 | Willow Creek Elementary School District / 212 |
| 336. | 2.72 | Cleveland Elementary School District / 63 |
| 337. | 2.71 | Fort Benton Elementary School District / 1,699 |
| 338. | 2.71 | Bear Paw Elementary School District / 122 |
| 339. | 2.71 | Hobson K-12 Schools / 875 |
| 340. | 2.70 | Rosebud High School District / 398 |
| 340. | 2.70 | Grass Range High School District / 420 |
| 342. | 2.70 | Conrad High School District / 3,333 |
| 343. | 2.70 | Froid Elementary School District / 443 |
| 343. | 2.70 | Froid High School District / 443 |
| 345. | 2.70 | Birney Elementary School District / 73 |
| 346. | 2.69 | Conrad Elementary School District / 3,221 |
| 347. | 2.69 | Brorson Elementary School District / 222 |
| 348. | 2.69 | Thompson Falls Elementary School District / 3,096 |
| 348. | 2.69 | Thompson Falls High School District / 3,096 |
| 350. | 2.69 | Cohagen Elementary School District / 55 |
| 351. | 2.69 | Rosebud Elementary School District / 375 |
| 352. | 2.68 | Alder Elementary School District / 292 |
| 353. | 2.68 | Jackson Elementary School District / 171 |
| 354. | 2.67 | Willow Creek High School District / 169 |
| 355. | 2.67 | Deer Creek Elementary School District / 1,622 |
| 356. | 2.67 | Stanford K-12 Schools / 857 |
| 357. | 2.67 | Cottonwood Elementary School District / 149 |
| 358. | 2.67 | Gardiner Elementary School District / 1,710 |
| 359. | 2.66 | Swan Valley Elementary School District / 403 |
| 360. | 2.66 | Ekalaka Elementary School District / 958 |
| 361. | 2.66 | Bynum Elementary School District / 161 |
| 362. | 2.66 | Lima K-12 Schools / 409 |
| 363. | 2.65 | Spring Creek Elementary School District / 78 |
| 364. | 2.65 | Hawks Home Elementary School District / 119 |
| 365. | 2.65 | Gardiner High School District / 1,787 |
| 366. | 2.64 | Carter County High School District / 1,237 |
| 367. | 2.64 | Shawmut Elementary School District / 103 |
| 368. | 2.63 | Spring Creek Elementary School District / 86 |
| 369. | 2.63 | Plevna K-12 Schools / 355 |
| 370. | 2.63 | Trego Elementary School District / 660 |
| 371. | 2.63 | Lennep Elementary School District / 52 |
| 372. | 2.62 | Kinsey Elementary School District / 416 |
| 373. | 2.62 | Pine Creek Elementary School District / 367 |
| 374. | 2.61 | Wise River Elementary School District / 294 |
| 375. | 2.59 | Trout Creek Elementary School District / 916 |
| 376. | 2.59 | Dawson High School District / 8,074 |
| 377. | 2.59 | Moore High School District / 387 |
| 377. | 2.59 | Moore Elementary School District / 387 |
| 379. | 2.59 | S Y Elementary School District / 78 |
| 380. | 2.58 | Augusta Elementary School District / 496 |
| 380. | 2.58 | Fairview Elementary School District / 1,403 |
| 382. | 2.58 | Scobey K-12 Schools / 1,346 |
| 383. | 2.58 | Malta K-12 Schools / 3,097 |
| 384. | 2.57 | Fairview High School District / 1,413 |
| 385. | 2.57 | Swan Lake-Salmon Elementary School District / 218 |
| 386. | 2.57 | Turner High School District / 321 |
| 386. | 2.57 | Turner Elementary School District / 312 |
| 388. | 2.56 | Sidney High School District / 6,811 |
| 389. | 2.55 | Landusky Elementary School District / 55 |
| 390. | 2.55 | Galata Elementary School District / 289 |
| 391. | 2.55 | Zurich Elementary School District / 263 |
| 392. | 2.54 | Glendive Elementary School District / 6,042 |
| 393. | 2.54 | Alzada Elementary School District / 160 |
| 394. | 2.53 | Sidney Elementary School District / 6,244 |
| 395. | 2.51 | Ryegate K-12 Schools / 341 |
| 396. | 2.51 | S H Elementary School District / 121 |
| 397. | 2.50 | Wisdom Elementary School District / 283 |
| 397. | 2.50 | Big Dry Creek Elementary School District / 33 |
| 397. | 2.50 | Bloomfield Elementary School District / 99 |
| 400. | 2.48 | Polaris Elementary School District / 118 |
| 401. | 2.47 | Plentywood K-12 Schools / 2,487 |
| 402. | 2.46 | Anaconda Elementary School District / 8,737 |
| 403. | 2.46 | Terry K-12 Schools / 1,004 |
| 404. | 2.46 | Anaconda High School District / 8,782 |
| 405. | 2.45 | Geyser Elementary School District / 202 |
| 406. | 2.44 | Sand Springs Elementary School District / 85 |
| 407. | 2.43 | Ovando Elementary School District / 208 |
| 408. | 2.41 | Benton Lake Elementary School District / 47 |
| 409. | 2.41 | McLeod Elementary School District / 170 |
| 410. | 2.40 | Richey High School District / 473 |
| 411. | 2.38 | Name N/A / 300 |
| 412. | 2.37 | Richey Elementary School District / 381 |
| 413. | 2.37 | Sylvanite Elementary School District / 118 |
| 414. | 2.34 | Geyser High School District / 334 |
| 415. | 2.33 | Whitlash Elementary School District / 29 |
| 416. | 2.30 | Name N/A / 227 |
| 417. | 2.30 | Kester Elementary School District / 38 |
| 418. | 2.29 | Cooke City Elementary School District / 77 |
| 419. | 2.25 | Springhill Elementary School District / 131 |
| 420. | 2.19 | Raynesford Elementary School District / 132 |
| 421. | 2.19 | Yaak Elementary School District / 148 |
| 422. | 2.14 | Ayers Elementary School District / 15 |
| 423. | 2.14 | Saco Elementary School District / 424 |
| 424. | 2.14 | Nye Elementary School District / 175 |
| 425. | 2.13 | Peerless K-12 Schools / 137 |
| 426. | 2.07 | Saco High School District / 388 |
| 427. | 2.04 | Melrose Elementary School District / 87 |
| 428. | 2.00 | Spring Creek Colony Elementary School District / 4 |
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.
