| Rank | Median Age ▲ | School District / Population |
| 1. | 15.40 | Yellowstone Academy Elementary School District / 115 |
| 2. | 15.60 | Ross Elementary School District / 68 |
| 3. | 23.20 | Plenty Coups High School District / 739 |
| 3. | 23.20 | Pryor Elementary School District / 739 |
| 5. | 23.70 | Rocky Boy Elementary School District / 3,598 |
| 6. | 24.50 | Ayers Elementary School District / 68 |
| 7. | 24.60 | Lame Deer Elementary School District / 2,765 |
| 8. | 24.70 | Heart Butte K-12 Schools / 698 |
| 9. | 24.80 | Rocky Boy High School District / 2,366 |
| 10. | 25.00 | Hays-Lodge Pole K-12 Schools / 1,459 |
| 11. | 26.40 | Lame Deer High School District / 5,329 |
| 12. | 26.50 | Warrick Elementary School District / 44 |
| 13. | 27.50 | Brockton Elementary School District / 545 |
| 13. | 27.50 | Frazer Elementary School District / 498 |
| 13. | 27.50 | Brockton High School District / 545 |
| 16. | 27.80 | Knees Elementary School District / 135 |
| 17. | 27.90 | Poplar High School District / 3,661 |
| 17. | 27.90 | Poplar Elementary School District / 3,661 |
| 19. | 28.20 | Kester Elementary School District / 44 |
| 19. | 28.20 | Wolf Point Elementary School District / 4,141 |
| 21. | 28.30 | Browning Elementary School District / 8,635 |
| 22. | 28.60 | Spring Creek Colony Elementary School District / 42 |
| 23. | 28.80 | Valley View Elementary School District / 308 |
| 24. | 28.90 | King Colony Elementary School District / 309 |
| 25. | 29.30 | Liberty Elementary School District / 171 |
| 26. | 29.60 | Wolf Point High School District / 4,735 |
| 27. | 29.90 | Harlem Elementary School District / 2,405 |
| 27. | 29.90 | Browning High School District / 9,318 |
| 27. | 29.90 | Frazer High School District / 719 |
| 30. | 30.00 | Lodge Grass Elementary School District / 1,467 |
| 30. | 30.00 | Big Sandy High School District / 2,612 |
| 32. | 30.30 | Lambert Elementary School District / 393 |
| 32. | 30.30 | Harlem High School District / 2,569 |
| 32. | 30.30 | Bozeman Elementary School District / 53,316 |
| 35. | 30.40 | Hardin Elementary School District / 10,144 |
| 36. | 30.80 | Trail Creek Elementary School District / 39 |
| 37. | 31.00 | Bozeman High School District / 59,840 |
| 38. | 31.30 | Lodge Grass High School District / 1,841 |
| 38. | 31.30 | S Y Elementary School District / 75 |
| 38. | 31.30 | Hardin High School District / 8,868 |
| 41. | 31.60 | Missoula Elementary School District / 70,909 |
| 42. | 31.70 | Dixon Elementary School District / 586 |
| 43. | 31.90 | Willow Creek High School District / 315 |
| 44. | 32.00 | Deerfield Elementary School District / 10 |
| 45. | 32.10 | Gildford Colony Elementary School District / 107 |
| 46. | 32.30 | Elysian Elementary School District / 1,338 |
| 46. | 32.30 | Whitewater K-12 Schools / 174 |
| 48. | 33.00 | Pendroy Elementary School District / 221 |
| 49. | 33.30 | Ashland Elementary School District / 1,205 |
| 50. | 33.60 | Belgrade Elementary School District / 20,497 |
| 51. | 33.70 | Belgrade High School District / 20,718 |
| 52. | 33.80 | Wyola Elementary School District / 374 |
| 52. | 33.80 | Miami Elementary School District / 232 |
| 54. | 33.90 | Missoula High School District / 102,467 |
| 55. | 34.00 | North Harlem Colony Elementary School District / 26 |
| 56. | 34.30 | Monforton Elementary School District / 2,232 |
| 56. | 34.30 | Willow Creek Elementary School District / 368 |
| 58. | 34.80 | Highwood High School District / 513 |
| 58. | 34.80 | Hawks Home Elementary School District / 127 |
| 60. | 34.90 | Power Elementary School District / 608 |
| 61. | 35.20 | Cut Bank Elementary School District / 4,323 |
| 61. | 35.20 | Cut Bank High School District / 4,323 |
| 63. | 35.30 | Lustre Elementary School District / 221 |
| 64. | 35.50 | West Valley Elementary School District / 3,967 |
| 65. | 35.60 | Charlo High School District / 1,834 |
| 66. | 35.70 | Havre Elementary School District / 12,161 |
| 67. | 35.80 | Box Elder High School District / 440 |
| 67. | 35.80 | Box Elder Elementary School District / 440 |
| 69. | 35.90 | Cleveland Elementary School District / 123 |
| 69. | 35.90 | Havre High School District / 12,531 |
| 71. | 36.10 | Ronan Elementary School District / 8,707 |
| 71. | 36.10 | Rau Elementary School District / 391 |
| 71. | 36.10 | Ronan High School District / 8,707 |
| 74. | 36.20 | Elder Grove Elementary School District / 3,410 |
| 75. | 36.30 | Springdale Elementary School District / 210 |
| 76. | 36.50 | Hellgate Elementary School District / 13,024 |
| 77. | 36.70 | St. Ignatius K-12 Schools / 3,369 |
| 77. | 36.70 | Amsterdam Elementary School District / 2,008 |
| 79. | 36.80 | Colstrip Elementary School District / 2,445 |
| 79. | 36.80 | Colstrip High School District / 2,445 |
| 81. | 37.00 | Lolo Elementary School District / 4,903 |
| 81. | 37.00 | Bainville K-12 Schools / 494 |
| 81. | 37.00 | Billings Elementary School District / 111,515 |
| 84. | 37.10 | Great Falls High School District / 72,595 |
| 84. | 37.10 | Great Falls Elementary School District / 72,487 |
| 86. | 37.30 | Savage High School District / 620 |
| 86. | 37.30 | Frenchtown K-12 Schools / 6,408 |
| 88. | 37.40 | Savage Elementary School District / 602 |
| 88. | 37.40 | Pleasant Valley Elementary School District / 219 |
| 90. | 37.50 | Name N/A / 2,538 |
| 90. | 37.50 | Billings High School District / 133,015 |
| 92. | 37.70 | Judith Gap Elementary School District / 325 |
| 92. | 37.70 | Judith Gap High School District / 325 |
| 94. | 37.90 | Kalispell Elementary School District / 28,320 |
| 94. | 37.90 | Lockwood Elementary School District / 8,067 |
| 96. | 38.00 | Roy K-12 Schools / 278 |
| 97. | 38.30 | De Smet Elementary School District / 796 |
| 97. | 38.30 | Rapelje Elementary School District / 348 |
| 97. | 38.30 | Frontier Elementary School District / 594 |
| 100. | 38.50 | Evergreen Elementary School District / 5,586 |
| 100. | 38.50 | Power High School District / 624 |
| 100. | 38.50 | Bonner Elementary School District / 2,581 |
| 103. | 38.70 | Baker K-12 Schools / 2,568 |
| 104. | 38.80 | East Helena Elementary School District / 9,282 |
| 105. | 38.90 | Sidney High School District / 8,438 |
| 105. | 38.90 | Name N/A / 891,341 |
| 107. | 39.00 | Turner Elementary School District / 322 |
| 107. | 39.00 | Sidney Elementary School District / 7,775 |
| 109. | 39.10 | Sunset Elementary School District / 209 |
| 109. | 39.10 | Lennep Elementary School District / 107 |
| 111. | 39.40 | Smith Valley Elementary School District / 1,883 |
| 111. | 39.40 | Turner High School District / 307 |
| 113. | 39.50 | Arlee Elementary School District / 2,479 |
| 113. | 39.50 | Arlee High School District / 2,479 |
| 113. | 39.50 | Carter Elementary School District / 208 |
| 116. | 39.70 | Shelby Elementary School District / 3,793 |
| 116. | 39.70 | Shelby High School District / 4,093 |
| 118. | 39.80 | Dillon Elementary School District / 7,763 |
| 119. | 39.90 | Clinton Elementary School District / 2,448 |
| 120. | 40.00 | Malmborg Elementary School District / 213 |
| 120. | 40.00 | Charlo Elementary School District / 1,248 |
| 122. | 40.10 | Miles City Elementary School District / 10,064 |
| 122. | 40.10 | Butte Elementary School District / 33,054 |
| 124. | 40.30 | Morin Elementary School District / 397 |
| 124. | 40.30 | Flathead High School District / 58,126 |
| 126. | 40.50 | Trego Elementary School District / 753 |
| 126. | 40.50 | Helena Flats Elementary School District / 1,780 |
| 126. | 40.50 | Pioneer Elementary School District / 1,147 |
| 129. | 40.60 | Fairview Elementary School District / 1,303 |
| 130. | 40.70 | Laurel High School District / 10,113 |
| 130. | 40.70 | Helena High School District / 62,953 |
| 130. | 40.70 | Laurel Elementary School District / 10,438 |
| 130. | 40.70 | West Yellowstone K-12 School District / 2,041 |
| 134. | 40.80 | Butte High School District / 34,435 |
| 134. | 40.80 | Cardwell Elementary School District / 435 |
| 134. | 40.80 | Helena Elementary School District / 51,357 |
| 137. | 40.90 | Fairfield High School District / 1,965 |
| 137. | 40.90 | West Glacier Elementary School District / 570 |
| 137. | 40.90 | Glendive Elementary School District / 6,617 |
| 140. | 41.10 | Bridger K-12 Schools / 1,739 |
| 140. | 41.10 | Culbertson High School District / 924 |
| 140. | 41.10 | Park City High School District / 2,061 |
| 140. | 41.10 | Fairview High School District / 1,345 |
| 144. | 41.20 | Custer County High School District / 11,869 |
| 144. | 41.20 | Fairfield Elementary School District / 1,270 |
| 144. | 41.20 | Greenfield Elementary School District / 572 |
| 147. | 41.30 | Dawson High School District / 8,728 |
| 148. | 41.40 | Lambert High School District / 283 |
| 149. | 41.50 | Zurich Elementary School District / 281 |
| 149. | 41.50 | Galata Elementary School District / 300 |
| 149. | 41.50 | Rapelje High School District / 455 |
| 152. | 41.60 | Trinity Elementary School District / 1,733 |
| 152. | 41.60 | Cottonwood Elementary School District / 347 |
| 154. | 41.70 | Deer Creek Elementary School District / 1,810 |
| 155. | 41.80 | Golden Ridge Elementary School District / 139 |
| 155. | 41.80 | Park City Elementary School District / 2,265 |
| 155. | 41.80 | Big Sandy Elementary School District / 1,336 |
| 158. | 42.20 | Vaughn Elementary School District / 1,034 |
| 158. | 42.20 | Broadview Elementary School District / 893 |
| 158. | 42.20 | Broadview High School District / 943 |
| 161. | 42.30 | Deep Creek Elementary School District / 95 |
| 162. | 42.50 | Beaverhead County High School District / 8,772 |
| 163. | 42.60 | Valier Elementary School District / 1,022 |
| 163. | 42.60 | Medicine Lake K-12 Schools / 747 |
| 163. | 42.60 | Deer Lodge Elementary School District / 5,648 |
| 163. | 42.60 | Gallatin Gateway Elementary School District / 1,711 |
| 167. | 42.70 | Culbertson Elementary School District / 1,007 |
| 167. | 42.70 | Three Forks Elementary School District / 3,485 |
| 167. | 42.70 | Simms High School District / 3,330 |
| 170. | 42.80 | Davey Elementary School District / 46 |
| 171. | 43.00 | Columbia Falls High School District / 15,228 |
| 171. | 43.00 | Columbia Falls Elementary School District / 14,658 |
| 171. | 43.00 | Valier High School District / 1,210 |
| 171. | 43.00 | Cottonwood Elementary School District / 114 |
| 175. | 43.10 | Sun River Valley Elementary School District / 2,296 |
| 176. | 43.20 | Corvallis K-12 Schools / 7,474 |
| 176. | 43.20 | Whitefish Elementary School District / 13,008 |
| 178. | 43.30 | Shepherd High School District / 4,069 |
| 178. | 43.30 | Shepherd Elementary School District / 4,069 |
| 178. | 43.30 | Manhattan High School District / 4,431 |
| 181. | 43.40 | Big Timber Elementary School District / 2,771 |
| 182. | 43.50 | Whitefish High School District / 13,669 |
| 182. | 43.50 | Kila Elementary School District / 2,090 |
| 184. | 43.60 | Centerville Elementary School District / 1,665 |
| 184. | 43.60 | Basin Elementary School District / 233 |
| 184. | 43.60 | Three Forks High School District / 3,381 |
| 187. | 43.80 | Montana City Elementary School District / 2,853 |
| 187. | 43.80 | Conrad High School District / 3,800 |
| 187. | 43.80 | Anderson Elementary School District / 1,397 |
| 190. | 44.10 | Centerville High School District / 1,615 |
| 191. | 44.20 | Huntley Project K-12 Schools / 3,538 |
| 191. | 44.20 | Livingston Elementary School District / 10,129 |
| 193. | 44.30 | Fishtail Elementary School District / 392 |
| 193. | 44.30 | Cayuse Prairie Elementary School District / 2,379 |
| 195. | 44.40 | Sweet Grass County High School District / 3,511 |
| 196. | 44.50 | Molt Elementary School District / 157 |
| 196. | 44.50 | Victor K-12 Schools / 3,538 |
| 198. | 44.60 | Moore High School District / 519 |
| 198. | 44.60 | Columbus Elementary School District / 3,754 |
| 198. | 44.60 | Moore Elementary School District / 519 |
| 201. | 44.80 | Conrad Elementary School District / 3,568 |
| 201. | 44.80 | McLeod Elementary School District / 240 |
| 201. | 44.80 | Swan River Elementary School District / 1,489 |
| 204. | 44.90 | Reichle Elementary School District / 127 |
| 204. | 44.90 | Polson Elementary School District / 10,500 |
| 204. | 44.90 | Park High School District / 12,483 |
| 204. | 44.90 | Glasgow K-12 Schools / 5,202 |
| 204. | 44.90 | Forsyth Elementary School District / 2,609 |
| 209. | 45.00 | Stevensville Elementary School District / 7,152 |
| 209. | 45.00 | Powell County High School District / 7,207 |
| 211. | 45.10 | Jefferson High School District / 8,158 |
| 212. | 45.20 | Stevensville High School District / 10,247 |
| 212. | 45.20 | Canyon Creek Elementary School District / 2,315 |
| 214. | 45.30 | Belt Elementary School District / 1,832 |
| 214. | 45.30 | Ennis K-12 Schools / 3,483 |
| 214. | 45.30 | Columbus High School District / 3,958 |
| 214. | 45.30 | Sand Springs Elementary School District / 148 |
| 214. | 45.30 | Independent Elementary School District / 2,659 |
| 219. | 45.50 | Belt High School District / 1,774 |
| 219. | 45.50 | East Glacier Park Elementary School District / 683 |
| 219. | 45.50 | Forsyth High School District / 2,680 |
| 222. | 45.60 | Lone Rock Elementary School District / 3,095 |
| 222. | 45.60 | Melville Elementary School District / 237 |
| 224. | 45.80 | Hall Elementary School District / 322 |
| 224. | 45.80 | Spring Creek Elementary School District / 44 |
| 226. | 45.90 | Manhattan Elementary School District / 2,390 |
| 226. | 45.90 | Alzada Elementary School District / 176 |
| 228. | 46.00 | North Star High School District / 941 |
| 229. | 46.10 | Lavina K-12 Schools / 385 |
| 229. | 46.10 | Deer Park Elementary School District / 1,119 |
| 229. | 46.10 | Garfield County High School District / 1,097 |
| 232. | 46.20 | Somers Elementary School District / 6,322 |
| 232. | 46.20 | Geraldine High School District / 568 |
| 234. | 46.30 | Polson High School District / 11,606 |
| 234. | 46.30 | Clancy Elementary School District / 2,935 |
| 234. | 46.30 | Townsend K-12 Schools / 5,219 |
| 237. | 46.40 | Florence-Carlton K-12 Schools / 5,211 |
| 237. | 46.40 | Elliston Elementary School District / 484 |
| 239. | 46.50 | Boulder Elementary School District / 2,137 |
| 239. | 46.50 | Kinsey Elementary School District / 559 |
| 241. | 46.60 | Anaconda Elementary School District / 8,970 |
| 241. | 46.60 | Dupuyer Elementary School District / 188 |
| 243. | 46.80 | Anaconda High School District / 9,046 |
| 243. | 46.80 | Pine Grove Elementary School District / 66 |
| 245. | 46.90 | Fortine Elementary School District / 898 |
| 245. | 46.90 | Olney-Bissell Elementary School District / 1,184 |
| 245. | 46.90 | Malta K-12 Schools / 3,160 |
| 248. | 47.00 | Froid High School District / 502 |
| 248. | 47.00 | Froid Elementary School District / 502 |
| 250. | 47.10 | Fair-Mont-Egan Elementary School District / 1,341 |
| 250. | 47.10 | Avon Elementary School District / 237 |
| 252. | 47.20 | Choteau High School District / 2,921 |
| 253. | 47.30 | Sunburst K-12 Schools / 1,115 |
| 254. | 47.60 | Chester-Joplin-Inverness High School District / 2,391 |
| 255. | 47.70 | North Star Elementary School District / 811 |
| 256. | 47.80 | Lincoln County High School District / 6,459 |
| 257. | 47.90 | Blue Creek Elementary School District / 2,052 |
| 258. | 48.10 | Plentywood K-12 Schools / 2,464 |
| 258. | 48.10 | Fergus High School District / 9,271 |
| 260. | 48.20 | Alberton K-12 Schools / 1,286 |
| 260. | 48.20 | Choteau Elementary School District / 2,399 |
| 262. | 48.30 | Winnett K-12 Schools / 489 |
| 262. | 48.30 | White Sulphur Springs High School District / 2,026 |
| 264. | 48.40 | Noxon Elementary School District / 1,502 |
| 264. | 48.40 | Richey Elementary School District / 426 |
| 266. | 48.50 | Roundup Elementary School District / 4,399 |
| 267. | 48.60 | Geyser Elementary School District / 389 |
| 267. | 48.60 | Geyser High School District / 389 |
| 267. | 48.60 | Roundup High School District / 4,551 |
| 270. | 48.70 | Gardiner Elementary School District / 1,733 |
| 270. | 48.70 | Lewistown Elementary School District / 8,920 |
| 270. | 48.70 | Chinook High School District / 2,241 |
| 273. | 48.80 | Arrowhead Elementary School District / 1,718 |
| 273. | 48.80 | White Sulphur Springs Elementary School District / 1,919 |
| 275. | 48.90 | Joliet High School District / 2,414 |
| 275. | 48.90 | La Motte Elementary School District / 778 |
| 275. | 48.90 | Gardiner High School District / 1,776 |
| 275. | 48.90 | Marion Elementary School District / 1,486 |
| 279. | 49.00 | Chester-Joplin-Inverness Elementary School District / 2,185 |
| 279. | 49.00 | Potomac Elementary School District / 1,062 |
| 279. | 49.00 | Cascade Elementary School District / 1,907 |
| 279. | 49.00 | Hamilton K-12 Schools / 11,592 |
| 283. | 49.10 | Eureka Elementary School District / 4,808 |
| 283. | 49.10 | Chinook Elementary School District / 1,856 |
| 285. | 49.20 | Joliet Elementary School District / 2,089 |
| 285. | 49.20 | Drummond High School District / 1,489 |
| 287. | 49.40 | Bynum Elementary School District / 301 |
| 287. | 49.40 | Cascade High School District / 2,639 |
| 287. | 49.40 | Carter County High School District / 1,187 |
| 287. | 49.40 | Jordan Elementary School District / 602 |
| 291. | 49.50 | Wibaux K-12 Schools / 987 |
| 291. | 49.50 | Red Lodge Elementary School District / 3,112 |
| 291. | 49.50 | Creston Elementary School District / 1,111 |
| 294. | 49.70 | Cohagen Elementary School District / 169 |
| 294. | 49.70 | Saco High School District / 516 |
| 296. | 49.80 | Helmville Elementary School District / 299 |
| 297. | 49.90 | Libby K-12 Schools / 9,600 |
| 297. | 49.90 | Circle Elementary School District / 1,167 |
| 299. | 50.00 | Thompson Falls Elementary School District / 3,734 |
| 299. | 50.00 | Thompson Falls High School District / 3,734 |
| 299. | 50.00 | Grant Elementary School District / 76 |
| 299. | 50.00 | Birney Elementary School District / 120 |
| 303. | 50.10 | Plevna K-12 Schools / 460 |
| 303. | 50.10 | Drummond Elementary School District / 1,167 |
| 305. | 50.20 | Red Lodge High School District / 3,631 |
| 306. | 50.30 | Scobey K-12 Schools / 1,813 |
| 307. | 50.40 | Harlowton Elementary School District / 1,816 |
| 307. | 50.40 | Rosebud High School District / 482 |
| 307. | 50.40 | Reedpoint High School District / 711 |
| 307. | 50.40 | Winifred K-12 Schools / 424 |
| 307. | 50.40 | Saco Elementary School District / 545 |
| 312. | 50.50 | Reedpoint Elementary School District / 718 |
| 312. | 50.50 | Broadus Elementary School District / 1,476 |
| 312. | 50.50 | Harlowton High School District / 1,882 |
| 312. | 50.50 | Dutton/Brady K-12 Schools / 1,068 |
| 312. | 50.50 | Dodson High School District / 344 |
| 312. | 50.50 | Cottonwood Elementary School District / 193 |
| 318. | 50.60 | Paradise Elementary School District / 389 |
| 319. | 50.70 | Fromberg K-12 Schools / 1,030 |
| 320. | 50.80 | Denton High School District / 479 |
| 320. | 50.80 | Circle High School District / 1,758 |
| 322. | 50.90 | Hobson K-12 Schools / 755 |
| 323. | 51.00 | Denton Elementary School District / 469 |
| 324. | 51.30 | Hysham K-12 Schools / 761 |
| 324. | 51.30 | Nashua K-12 Schools / 800 |
| 326. | 51.40 | Brorson Elementary School District / 116 |
| 326. | 51.40 | Grass Range High School District / 488 |
| 328. | 51.50 | Richey High School District / 491 |
| 329. | 51.60 | Harrison K-12 Schools / 749 |
| 330. | 51.70 | Shields Valley Elementary School District / 1,705 |
| 330. | 51.70 | Shields Valley High School District / 1,705 |
| 332. | 51.80 | Bigfork High School District / 7,593 |
| 333. | 51.90 | Jackson Elementary School District / 129 |
| 333. | 51.90 | Darby K-12 Schools / 3,554 |
| 333. | 51.90 | Superior K-12 Schools / 2,108 |
| 336. | 52.00 | Hinsdale Elementary School District / 461 |
| 336. | 52.00 | Lima K-12 Schools / 522 |
| 336. | 52.00 | Vida Elementary School District / 591 |
| 339. | 52.10 | Powder River County High School District / 1,728 |
| 340. | 52.20 | Ekalaka Elementary School District / 884 |
| 340. | 52.20 | Ulm Elementary School District / 637 |
| 340. | 52.20 | Plains High School District / 3,177 |
| 343. | 52.30 | Stanford K-12 Schools / 835 |
| 343. | 52.30 | Twin Bridges K-12 Schools / 1,382 |
| 343. | 52.30 | Whitlash Elementary School District / 35 |
| 346. | 52.40 | Ramsay Elementary School District / 1,114 |
| 346. | 52.40 | Kircher Elementary School District / 797 |
| 346. | 52.40 | Plains Elementary School District / 2,788 |
| 349. | 52.50 | Benton Lake Elementary School District / 95 |
| 350. | 52.60 | Custer K-12 Schools / 411 |
| 351. | 52.70 | Seeley Lake Elementary School District / 1,571 |
| 351. | 52.70 | Sheridan Elementary School District / 1,378 |
| 353. | 52.80 | Cooke City Elementary School District / 43 |
| 353. | 52.80 | Roberts K-12 Schools / 747 |
| 355. | 52.90 | Sheridan High School District / 1,650 |
| 356. | 53.00 | Hinsdale High School District / 490 |
| 356. | 53.00 | Pass Creek Elementary School District / 92 |
| 356. | 53.00 | Whitehall High School District / 3,793 |
| 356. | 53.00 | Noxon High School District / 2,403 |
| 356. | 53.00 | Opheim K-12 Schools / 307 |
| 361. | 53.10 | Augusta High School District / 689 |
| 361. | 53.10 | Augusta Elementary School District / 685 |
| 363. | 53.20 | Target Range Elementary School District / 3,691 |
| 363. | 53.20 | Bigfork Elementary School District / 5,893 |
| 365. | 53.30 | Fort Benton High School District / 2,166 |
| 365. | 53.30 | South Stacey Elementary School District / 47 |
| 365. | 53.30 | McCormick Elementary School District / 500 |
| 365. | 53.30 | Belfry K-12 Schools / 628 |
| 369. | 53.40 | Alder Elementary School District / 272 |
| 370. | 53.50 | Lincoln K-12 Schools / 1,130 |
| 371. | 53.60 | Lindsay Elementary School District / 291 |
| 372. | 53.70 | Terry K-12 Schools / 1,282 |
| 372. | 53.70 | Hot Springs High School District / 1,471 |
| 372. | 53.70 | Grass Range Elementary School District / 420 |
| 375. | 53.90 | Absarokee High School District / 2,076 |
| 375. | 53.90 | Swan Lake-Salmon Elementary School District / 387 |
| 377. | 54.10 | Luther Elementary School District / 385 |
| 378. | 54.20 | Upper West Shore Elementary School District / 798 |
| 379. | 54.30 | Woodman Elementary School District / 458 |
| 379. | 54.30 | Westby K-12 Schools / 299 |
| 381. | 54.50 | Absarokee Elementary School District / 1,608 |
| 382. | 54.70 | Melstone High School District / 179 |
| 383. | 54.80 | St. Regis K-12 Schools / 1,333 |
| 384. | 55.00 | Greycliff Elementary School District / 234 |
| 384. | 55.00 | Whitehall Elementary School District / 3,215 |
| 386. | 55.10 | Fort Benton Elementary School District / 1,728 |
| 387. | 55.20 | Bloomfield Elementary School District / 98 |
| 388. | 55.30 | Bear Paw Elementary School District / 104 |
| 389. | 55.40 | Ryegate K-12 Schools / 353 |
| 389. | 55.40 | Spring Creek Elementary School District / 87 |
| 391. | 55.50 | Melrose Elementary School District / 97 |
| 391. | 55.50 | Wise River Elementary School District / 383 |
| 391. | 55.50 | Garrison Elementary School District / 93 |
| 394. | 55.60 | Gold Creek Elementary School District / 207 |
| 395. | 55.70 | Wisdom Elementary School District / 285 |
| 396. | 55.80 | S H Elementary School District / 157 |
| 397. | 56.00 | Pine Creek Elementary School District / 448 |
| 398. | 56.20 | Troy High School District / 3,396 |
| 398. | 56.20 | Swan Valley Elementary School District / 639 |
| 400. | 56.40 | Wolf Creek Elementary School District / 581 |
| 401. | 56.50 | Shawmut Elementary School District / 66 |
| 402. | 56.80 | Troy Elementary School District / 2,629 |
| 403. | 57.30 | Biddle Elementary School District / 101 |
| 404. | 57.60 | Nye Elementary School District / 210 |
| 405. | 57.70 | Springhill Elementary School District / 148 |
| 406. | 57.80 | Philipsburg K-12 Schools / 1,644 |
| 407. | 58.10 | Yaak Elementary School District / 267 |
| 408. | 58.50 | Auchard Creek Elementary School District / 4 |
| 409. | 59.00 | Melstone Elementary School District / 402 |
| 410. | 59.30 | Divide Elementary School District / 170 |
| 411. | 60.30 | Ovando Elementary School District / 239 |
| 412. | 60.60 | Trout Creek Elementary School District / 901 |
| 413. | 62.20 | Polaris Elementary School District / 85 |
Please note that we only rank locations with 'Median Age' data. The rank above might not be a complete list. Locations without 'Median Age' data are not listed.
