| Rank | Median Age ▲ | School District / Population |
| 1. | 15.20 | Ross Elementary School District / 59 |
| 2. | 22.00 | Plenty Coups High School District / 953 |
| 2. | 22.00 | Pryor Elementary School District / 953 |
| 4. | 22.70 | Lame Deer Elementary School District / 2,767 |
| 5. | 22.80 | Brockton Elementary School District / 686 |
| 5. | 22.80 | Brockton High School District / 686 |
| 7. | 24.80 | Deerfield Elementary School District / 29 |
| 8. | 25.00 | Rocky Boy Elementary School District / 3,238 |
| 9. | 25.20 | Heart Butte K-12 Schools / 681 |
| 10. | 26.40 | Lame Deer High School District / 5,174 |
| 11. | 27.50 | Rocky Boy High School District / 2,052 |
| 12. | 27.70 | Knees Elementary School District / 148 |
| 13. | 28.00 | Hays-Lodge Pole K-12 Schools / 1,181 |
| 14. | 28.40 | Poplar Elementary School District / 3,344 |
| 14. | 28.40 | Browning Elementary School District / 8,209 |
| 14. | 28.40 | Poplar High School District / 3,344 |
| 14. | 28.40 | Harlem Elementary School District / 2,653 |
| 18. | 28.90 | Harlem High School District / 2,728 |
| 19. | 29.20 | Browning High School District / 9,016 |
| 20. | 29.30 | Dixon Elementary School District / 613 |
| 20. | 29.30 | Bozeman Elementary School District / 51,299 |
| 22. | 29.90 | Spring Creek Elementary School District / 95 |
| 22. | 29.90 | Big Sandy High School District / 2,532 |
| 24. | 30.20 | Wolf Point Elementary School District / 3,879 |
| 25. | 30.30 | Liberty Elementary School District / 149 |
| 26. | 30.40 | Frazer Elementary School District / 425 |
| 26. | 30.40 | Wolf Point High School District / 4,527 |
| 26. | 30.40 | Bozeman High School District / 57,488 |
| 29. | 30.70 | Lodge Grass Elementary School District / 1,549 |
| 30. | 31.40 | Missoula Elementary School District / 69,543 |
| 31. | 31.60 | Hardin Elementary School District / 9,474 |
| 32. | 31.80 | Roy K-12 Schools / 333 |
| 33. | 31.90 | Garrison Elementary School District / 154 |
| 34. | 32.00 | Hardin High School District / 8,303 |
| 35. | 32.30 | Bainville K-12 Schools / 479 |
| 36. | 32.40 | St. Ignatius K-12 Schools / 3,676 |
| 37. | 32.80 | Lodge Grass High School District / 2,019 |
| 38. | 33.20 | Charlo High School District / 1,910 |
| 38. | 33.20 | Pendroy Elementary School District / 309 |
| 40. | 33.40 | Frontier Elementary School District / 648 |
| 41. | 33.60 | Missoula High School District / 100,130 |
| 42. | 33.80 | Gildford Colony Elementary School District / 91 |
| 43. | 33.90 | Basin Elementary School District / 244 |
| 43. | 33.90 | Elysian Elementary School District / 1,079 |
| 43. | 33.90 | Belgrade Elementary School District / 20,505 |
| 46. | 34.10 | Belgrade High School District / 20,757 |
| 47. | 34.30 | Miami Elementary School District / 211 |
| 47. | 34.30 | Ashland Elementary School District / 1,110 |
| 47. | 34.30 | Frazer High School District / 634 |
| 50. | 34.60 | Davey Elementary School District / 41 |
| 51. | 35.20 | Hellgate Elementary School District / 13,221 |
| 51. | 35.20 | Medicine Lake K-12 Schools / 868 |
| 53. | 35.30 | Havre Elementary School District / 12,257 |
| 53. | 35.30 | Havre High School District / 12,675 |
| 55. | 35.70 | Ronan Elementary School District / 8,775 |
| 55. | 35.70 | Ronan High School District / 8,775 |
| 57. | 35.90 | Smith Valley Elementary School District / 1,982 |
| 58. | 36.10 | Pioneer Elementary School District / 1,187 |
| 59. | 36.40 | East Glacier Park Elementary School District / 807 |
| 59. | 36.40 | Kalispell Elementary School District / 27,618 |
| 61. | 36.50 | Cleveland Elementary School District / 50 |
| 62. | 36.60 | West Yellowstone K-12 School District / 2,005 |
| 63. | 36.90 | Shawmut Elementary School District / 73 |
| 64. | 37.00 | Deer Creek Elementary School District / 1,719 |
| 65. | 37.10 | Colstrip Elementary School District / 2,674 |
| 65. | 37.10 | Colstrip High School District / 2,674 |
| 67. | 37.30 | Cut Bank High School District / 4,406 |
| 67. | 37.30 | Cut Bank Elementary School District / 4,406 |
| 69. | 37.50 | Valley View Elementary School District / 277 |
| 69. | 37.50 | West Glacier Elementary School District / 555 |
| 71. | 37.60 | Power Elementary School District / 573 |
| 71. | 37.60 | Pleasant Valley Elementary School District / 170 |
| 71. | 37.60 | Great Falls High School District / 71,447 |
| 71. | 37.60 | Great Falls Elementary School District / 71,331 |
| 71. | 37.60 | Name N/A / 2,131 |
| 76. | 37.70 | Billings Elementary School District / 107,997 |
| 77. | 37.80 | Monforton Elementary School District / 2,074 |
| 78. | 37.90 | Power High School District / 580 |
| 79. | 38.00 | Columbia Falls High School District / 14,823 |
| 79. | 38.00 | Columbia Falls Elementary School District / 14,268 |
| 79. | 38.00 | Billings High School District / 128,803 |
| 82. | 38.10 | Lambert High School District / 295 |
| 83. | 38.20 | East Helena Elementary School District / 9,157 |
| 83. | 38.20 | Fairview Elementary School District / 1,251 |
| 85. | 38.40 | S Y Elementary School District / 49 |
| 86. | 38.50 | Morin Elementary School District / 495 |
| 86. | 38.50 | Baker K-12 Schools / 2,590 |
| 86. | 38.50 | Charlo Elementary School District / 1,297 |
| 89. | 38.60 | Lockwood Elementary School District / 7,779 |
| 90. | 38.80 | Zurich Elementary School District / 299 |
| 90. | 38.80 | Helena Flats Elementary School District / 1,884 |
| 92. | 38.90 | Malmborg Elementary School District / 248 |
| 92. | 38.90 | Lavina K-12 Schools / 441 |
| 92. | 38.90 | Laurel Elementary School District / 10,859 |
| 95. | 39.10 | Lolo Elementary School District / 4,450 |
| 95. | 39.10 | Rapelje Elementary School District / 347 |
| 95. | 39.10 | Name N/A / 878,315 |
| 98. | 39.40 | Savage Elementary School District / 631 |
| 99. | 39.50 | Elder Grove Elementary School District / 2,982 |
| 99. | 39.50 | Belt Elementary School District / 2,282 |
| 99. | 39.50 | Yellowstone Academy Elementary School District / 130 |
| 99. | 39.50 | Fairview High School District / 1,290 |
| 103. | 39.60 | McLeod Elementary School District / 258 |
| 104. | 39.70 | Sand Springs Elementary School District / 111 |
| 104. | 39.70 | Laurel High School District / 10,417 |
| 104. | 39.70 | Bynum Elementary School District / 278 |
| 107. | 39.80 | King Colony Elementary School District / 258 |
| 108. | 39.90 | Flathead High School District / 56,804 |
| 108. | 39.90 | Evergreen Elementary School District / 5,567 |
| 110. | 40.00 | Amsterdam Elementary School District / 1,975 |
| 110. | 40.00 | Savage High School District / 645 |
| 110. | 40.00 | Belt High School District / 2,236 |
| 110. | 40.00 | Greycliff Elementary School District / 278 |
| 114. | 40.10 | Sidney Elementary School District / 7,143 |
| 115. | 40.30 | Frenchtown K-12 Schools / 6,743 |
| 115. | 40.30 | Culbertson High School District / 996 |
| 115. | 40.30 | Miles City Elementary School District / 9,908 |
| 118. | 40.40 | Helena High School District / 61,687 |
| 118. | 40.40 | Helena Elementary School District / 50,452 |
| 120. | 40.50 | Cottonwood Elementary School District / 397 |
| 120. | 40.50 | Wyola Elementary School District / 470 |
| 122. | 40.60 | Park City High School District / 2,154 |
| 122. | 40.60 | South Stacey Elementary School District / 103 |
| 124. | 40.70 | Bonner Elementary School District / 2,513 |
| 124. | 40.70 | Valier Elementary School District / 1,245 |
| 126. | 40.80 | Dillon Elementary School District / 7,659 |
| 127. | 40.90 | Spring Creek Elementary School District / 99 |
| 127. | 40.90 | Sidney High School District / 7,731 |
| 127. | 40.90 | West Valley Elementary School District / 3,597 |
| 130. | 41.00 | Clinton Elementary School District / 2,314 |
| 130. | 41.00 | Culbertson Elementary School District / 1,118 |
| 132. | 41.20 | Park City Elementary School District / 2,305 |
| 132. | 41.20 | Lambert Elementary School District / 324 |
| 134. | 41.30 | Bloomfield Elementary School District / 113 |
| 134. | 41.30 | Butte Elementary School District / 32,639 |
| 134. | 41.30 | Kila Elementary School District / 2,045 |
| 137. | 41.40 | Highwood Elementary School District / 512 |
| 137. | 41.40 | Big Sandy Elementary School District / 1,326 |
| 139. | 41.50 | Shelby Elementary School District / 3,790 |
| 139. | 41.50 | Warrick Elementary School District / 20 |
| 141. | 41.70 | Butte High School District / 34,143 |
| 141. | 41.70 | Custer County High School District / 11,706 |
| 143. | 41.80 | Shelby High School District / 4,048 |
| 144. | 41.90 | Manhattan High School District / 4,646 |
| 145. | 42.00 | Rapelje High School District / 438 |
| 145. | 42.00 | Denton High School District / 610 |
| 145. | 42.00 | Dawson High School District / 8,567 |
| 148. | 42.20 | Fair-Mont-Egan Elementary School District / 1,449 |
| 149. | 42.30 | Montana City Elementary School District / 2,970 |
| 149. | 42.30 | Denton Elementary School District / 581 |
| 151. | 42.40 | Valier High School District / 1,473 |
| 151. | 42.40 | Shepherd High School District / 3,927 |
| 151. | 42.40 | Shepherd Elementary School District / 3,927 |
| 154. | 42.50 | Choteau High School District / 3,203 |
| 154. | 42.50 | Noxon Elementary School District / 1,791 |
| 156. | 42.60 | Glendive Elementary School District / 6,490 |
| 157. | 42.70 | Manhattan Elementary School District / 2,624 |
| 157. | 42.70 | Huntley Project K-12 Schools / 3,701 |
| 157. | 42.70 | Victor K-12 Schools / 3,338 |
| 160. | 42.80 | Richey Elementary School District / 389 |
| 161. | 42.90 | Broadview High School District / 978 |
| 162. | 43.00 | Arlee High School District / 2,290 |
| 162. | 43.00 | Arlee Elementary School District / 2,290 |
| 162. | 43.00 | Blue Creek Elementary School District / 2,204 |
| 162. | 43.00 | De Smet Elementary School District / 694 |
| 162. | 43.00 | Independent Elementary School District / 2,739 |
| 167. | 43.10 | Big Timber Elementary School District / 2,719 |
| 167. | 43.10 | Sweet Grass County High School District / 3,533 |
| 167. | 43.10 | Ulm Elementary School District / 714 |
| 170. | 43.20 | Box Elder Elementary School District / 338 |
| 170. | 43.20 | Box Elder High School District / 338 |
| 170. | 43.20 | Deer Lodge Elementary School District / 5,626 |
| 173. | 43.40 | Willow Creek High School District / 375 |
| 173. | 43.40 | Cottonwood Elementary School District / 205 |
| 175. | 43.50 | Reedpoint High School District / 641 |
| 175. | 43.50 | Broadview Elementary School District / 920 |
| 175. | 43.50 | Beaverhead County High School District / 8,712 |
| 178. | 43.60 | Lone Rock Elementary School District / 3,401 |
| 179. | 43.70 | Livingston Elementary School District / 9,903 |
| 179. | 43.70 | Canyon Creek Elementary School District / 2,211 |
| 181. | 43.90 | Willow Creek Elementary School District / 418 |
| 181. | 43.90 | Anderson Elementary School District / 1,311 |
| 183. | 44.00 | Centerville High School District / 1,683 |
| 184. | 44.10 | Centerville Elementary School District / 1,753 |
| 185. | 44.20 | Circle Elementary School District / 1,362 |
| 185. | 44.20 | Lustre Elementary School District / 209 |
| 185. | 44.20 | Florence-Carlton K-12 Schools / 5,443 |
| 185. | 44.20 | Glasgow K-12 Schools / 5,157 |
| 189. | 44.30 | Gallatin Gateway Elementary School District / 1,559 |
| 190. | 44.50 | Birney Elementary School District / 134 |
| 190. | 44.50 | Hawks Home Elementary School District / 134 |
| 190. | 44.50 | Harrison K-12 Schools / 824 |
| 190. | 44.50 | Bridger K-12 Schools / 1,528 |
| 190. | 44.50 | Melville Elementary School District / 216 |
| 195. | 44.60 | Stevensville High School District / 10,559 |
| 196. | 44.70 | Highwood High School District / 466 |
| 196. | 44.70 | Molt Elementary School District / 149 |
| 198. | 44.80 | Jefferson High School District / 8,101 |
| 199. | 44.90 | Kester Elementary School District / 47 |
| 199. | 44.90 | Polson Elementary School District / 9,980 |
| 199. | 44.90 | Cayuse Prairie Elementary School District / 2,703 |
| 199. | 44.90 | Elliston Elementary School District / 398 |
| 199. | 44.90 | Park High School District / 12,435 |
| 204. | 45.00 | Three Forks Elementary School District / 3,148 |
| 204. | 45.00 | Stevensville Elementary School District / 7,158 |
| 206. | 45.10 | Whitefish Elementary School District / 13,286 |
| 206. | 45.10 | Powell County High School District / 7,234 |
| 208. | 45.20 | Columbus Elementary School District / 3,669 |
| 209. | 45.30 | Whitefish High School District / 13,999 |
| 209. | 45.30 | Geraldine High School District / 664 |
| 209. | 45.30 | Choteau Elementary School District / 2,616 |
| 212. | 45.40 | Fromberg K-12 Schools / 1,317 |
| 213. | 45.50 | Cottonwood Elementary School District / 121 |
| 214. | 45.60 | Columbus High School District / 3,820 |
| 214. | 45.60 | Reedpoint Elementary School District / 682 |
| 216. | 45.70 | Forsyth Elementary School District / 2,524 |
| 216. | 45.70 | Townsend K-12 Schools / 5,148 |
| 216. | 45.70 | Conrad High School District / 3,568 |
| 219. | 45.80 | Kinsey Elementary School District / 569 |
| 220. | 45.90 | Three Forks High School District / 3,076 |
| 220. | 45.90 | Sunset Elementary School District / 235 |
| 220. | 45.90 | Boulder Elementary School District / 2,155 |
| 223. | 46.00 | Corvallis K-12 Schools / 7,547 |
| 224. | 46.20 | Conrad Elementary School District / 3,357 |
| 224. | 46.20 | Swan River Elementary School District / 1,611 |
| 226. | 46.30 | Geraldine Elementary School District / 610 |
| 226. | 46.30 | Chinook Elementary School District / 1,889 |
| 226. | 46.30 | Anaconda Elementary School District / 9,029 |
| 229. | 46.40 | Polson High School District / 11,057 |
| 229. | 46.40 | Cardwell Elementary School District / 397 |
| 231. | 46.50 | Anaconda High School District / 9,110 |
| 231. | 46.50 | Hall Elementary School District / 302 |
| 231. | 46.50 | Chinook High School District / 2,267 |
| 234. | 46.70 | Brorson Elementary School District / 176 |
| 234. | 46.70 | Malta K-12 Schools / 3,272 |
| 234. | 46.70 | Jordan Elementary School District / 624 |
| 234. | 46.70 | White Sulphur Springs Elementary School District / 1,853 |
| 234. | 46.70 | Wisdom Elementary School District / 333 |
| 239. | 46.80 | Somers Elementary School District / 5,769 |
| 239. | 46.80 | Shields Valley Elementary School District / 1,893 |
| 239. | 46.80 | Shields Valley High School District / 1,893 |
| 242. | 46.90 | Sunburst K-12 Schools / 1,162 |
| 242. | 46.90 | Red Lodge Elementary School District / 3,120 |
| 242. | 46.90 | Forsyth High School District / 2,588 |
| 242. | 46.90 | White Sulphur Springs High School District / 1,900 |
| 242. | 46.90 | Alberton K-12 Schools / 1,198 |
| 247. | 47.00 | Libby K-12 Schools / 10,030 |
| 247. | 47.00 | Simms High School District / 3,312 |
| 247. | 47.00 | Vaughn Elementary School District / 1,054 |
| 250. | 47.10 | Circle High School District / 1,808 |
| 250. | 47.10 | Sun River Valley Elementary School District / 2,258 |
| 252. | 47.20 | Twin Bridges K-12 Schools / 1,419 |
| 252. | 47.20 | Noxon High School District / 2,618 |
| 254. | 47.50 | Springdale Elementary School District / 160 |
| 254. | 47.50 | Broadus Elementary School District / 1,296 |
| 254. | 47.50 | Creston Elementary School District / 1,202 |
| 257. | 47.60 | Winnett K-12 Schools / 566 |
| 257. | 47.60 | Olney-Bissell Elementary School District / 1,074 |
| 257. | 47.60 | Powder River County High School District / 1,654 |
| 260. | 47.70 | Red Lodge High School District / 3,565 |
| 260. | 47.70 | Richey High School District / 455 |
| 262. | 47.80 | Harlowton High School District / 1,852 |
| 262. | 47.80 | Greenfield Elementary School District / 506 |
| 264. | 47.90 | Harlowton Elementary School District / 1,779 |
| 264. | 47.90 | Fairfield High School District / 1,690 |
| 264. | 47.90 | Drummond High School District / 1,526 |
| 267. | 48.00 | Ramsay Elementary School District / 1,257 |
| 267. | 48.00 | Roundup Elementary School District / 4,152 |
| 267. | 48.00 | Garfield County High School District / 1,100 |
| 267. | 48.00 | Fishtail Elementary School District / 298 |
| 271. | 48.10 | Fergus High School District / 9,218 |
| 271. | 48.10 | Golden Ridge Elementary School District / 171 |
| 271. | 48.10 | Fairfield Elementary School District / 1,020 |
| 274. | 48.20 | Roundup High School District / 4,330 |
| 274. | 48.20 | Lewistown Elementary School District / 8,923 |
| 276. | 48.30 | Helmville Elementary School District / 344 |
| 276. | 48.30 | Drummond Elementary School District / 1,224 |
| 276. | 48.30 | Auchard Creek Elementary School District / 7 |
| 279. | 48.50 | Chester-Joplin-Inverness High School District / 2,451 |
| 279. | 48.50 | Darby K-12 Schools / 3,631 |
| 279. | 48.50 | Trego Elementary School District / 721 |
| 282. | 48.70 | Deep Creek Elementary School District / 129 |
| 282. | 48.70 | Trinity Elementary School District / 1,420 |
| 284. | 48.80 | North Star High School District / 967 |
| 284. | 48.80 | Rau Elementary School District / 286 |
| 286. | 48.90 | Hamilton K-12 Schools / 11,101 |
| 286. | 48.90 | Seeley Lake Elementary School District / 1,777 |
| 288. | 49.00 | Melstone High School District / 250 |
| 288. | 49.00 | Westby K-12 Schools / 320 |
| 288. | 49.00 | Eureka Elementary School District / 4,688 |
| 288. | 49.00 | Joliet High School District / 2,338 |
| 292. | 49.10 | Lincoln County High School District / 6,225 |
| 292. | 49.10 | Galata Elementary School District / 258 |
| 294. | 49.20 | Moore Elementary School District / 460 |
| 294. | 49.20 | Biddle Elementary School District / 109 |
| 294. | 49.20 | Superior K-12 Schools / 2,361 |
| 294. | 49.20 | Deer Park Elementary School District / 1,103 |
| 294. | 49.20 | Moore High School District / 460 |
| 294. | 49.20 | Carter Elementary School District / 151 |
| 300. | 49.30 | Lindsay Elementary School District / 339 |
| 300. | 49.30 | North Star Elementary School District / 856 |
| 300. | 49.30 | Chester-Joplin-Inverness Elementary School District / 2,263 |
| 303. | 49.40 | Arrowhead Elementary School District / 1,889 |
| 304. | 49.50 | Clancy Elementary School District / 2,732 |
| 304. | 49.50 | Ennis K-12 Schools / 3,471 |
| 306. | 49.60 | Gardiner Elementary School District / 1,563 |
| 307. | 49.70 | Gardiner High School District / 1,615 |
| 308. | 49.80 | Avon Elementary School District / 214 |
| 309. | 49.90 | Alzada Elementary School District / 183 |
| 310. | 50.00 | Turner High School District / 338 |
| 310. | 50.00 | Woodman Elementary School District / 472 |
| 310. | 50.00 | Turner Elementary School District / 344 |
| 310. | 50.00 | Cascade High School District / 2,570 |
| 314. | 50.10 | Augusta High School District / 770 |
| 315. | 50.20 | Hinsdale Elementary School District / 419 |
| 315. | 50.20 | Stanford K-12 Schools / 924 |
| 315. | 50.20 | Augusta Elementary School District / 763 |
| 315. | 50.20 | Potomac Elementary School District / 895 |
| 315. | 50.20 | Wibaux K-12 Schools / 899 |
| 320. | 50.30 | St. Regis K-12 Schools / 1,258 |
| 320. | 50.30 | Hinsdale High School District / 438 |
| 322. | 50.50 | Pass Creek Elementary School District / 113 |
| 322. | 50.50 | Whitehall High School District / 3,632 |
| 324. | 50.70 | Plevna K-12 Schools / 461 |
| 324. | 50.70 | Roberts K-12 Schools / 697 |
| 326. | 50.80 | Hobson K-12 Schools / 772 |
| 327. | 50.90 | Dutton/Brady K-12 Schools / 1,034 |
| 327. | 50.90 | Fortine Elementary School District / 816 |
| 329. | 51.00 | Dupuyer Elementary School District / 228 |
| 330. | 51.10 | Whitehall Elementary School District / 3,133 |
| 330. | 51.10 | Winifred K-12 Schools / 384 |
| 332. | 51.20 | Marion Elementary School District / 1,354 |
| 333. | 51.30 | Thompson Falls High School District / 3,405 |
| 333. | 51.30 | Carter County High School District / 1,261 |
| 333. | 51.30 | Thompson Falls Elementary School District / 3,405 |
| 333. | 51.30 | Nye Elementary School District / 283 |
| 337. | 51.40 | Plentywood K-12 Schools / 2,259 |
| 337. | 51.40 | La Motte Elementary School District / 792 |
| 339. | 51.50 | Joliet Elementary School District / 1,896 |
| 339. | 51.50 | Hot Springs Elementary School District / 1,565 |
| 339. | 51.50 | Hot Springs High School District / 1,565 |
| 342. | 51.60 | Rosebud High School District / 396 |
| 342. | 51.60 | Nashua K-12 Schools / 854 |
| 344. | 51.70 | Scobey K-12 Schools / 1,734 |
| 344. | 51.70 | Lima K-12 Schools / 516 |
| 346. | 51.80 | Plains Elementary School District / 2,861 |
| 346. | 51.80 | Bigfork High School District / 7,617 |
| 346. | 51.80 | Custer K-12 Schools / 474 |
| 349. | 51.90 | Hysham K-12 Schools / 698 |
| 350. | 52.00 | Melrose Elementary School District / 88 |
| 350. | 52.00 | Ekalaka Elementary School District / 944 |
| 350. | 52.00 | Trail Creek Elementary School District / 32 |
| 353. | 52.10 | Plains High School District / 3,250 |
| 354. | 52.20 | Absarokee High School District / 2,105 |
| 355. | 52.30 | Froid High School District / 445 |
| 355. | 52.30 | Kircher Elementary School District / 824 |
| 355. | 52.30 | Cascade Elementary School District / 1,727 |
| 355. | 52.30 | Froid Elementary School District / 445 |
| 355. | 52.30 | Jackson Elementary School District / 140 |
| 355. | 52.30 | Swan Lake-Salmon Elementary School District / 389 |
| 361. | 52.40 | Absarokee Elementary School District / 1,634 |
| 362. | 52.50 | Fort Benton High School District / 2,149 |
| 362. | 52.50 | Geyser Elementary School District / 347 |
| 362. | 52.50 | Geyser High School District / 347 |
| 365. | 52.60 | McCormick Elementary School District / 593 |
| 366. | 52.80 | Whitewater K-12 Schools / 123 |
| 366. | 52.80 | Sheridan Elementary School District / 1,320 |
| 368. | 52.90 | Saco High School District / 488 |
| 368. | 52.90 | Bigfork Elementary School District / 5,807 |
| 370. | 53.00 | Cooke City Elementary School District / 52 |
| 370. | 53.00 | Target Range Elementary School District / 3,331 |
| 370. | 53.00 | Saco Elementary School District / 507 |
| 373. | 53.30 | Reichle Elementary School District / 92 |
| 374. | 53.40 | Sheridan High School District / 1,622 |
| 375. | 53.50 | Divide Elementary School District / 159 |
| 376. | 53.80 | Benton Lake Elementary School District / 68 |
| 376. | 53.80 | Whitlash Elementary School District / 39 |
| 378. | 54.00 | Lincoln K-12 Schools / 975 |
| 378. | 54.00 | Vida Elementary School District / 446 |
| 380. | 54.20 | Fort Benton Elementary School District / 1,790 |
| 380. | 54.20 | Opheim K-12 Schools / 340 |
| 382. | 54.30 | Alder Elementary School District / 302 |
| 382. | 54.30 | Troy High School District / 3,339 |
| 382. | 54.30 | Troy Elementary School District / 2,534 |
| 385. | 54.70 | Wolf Creek Elementary School District / 658 |
| 386. | 54.80 | Pine Creek Elementary School District / 504 |
| 386. | 54.80 | Grant Elementary School District / 103 |
| 388. | 55.10 | Judith Gap Elementary School District / 357 |
| 388. | 55.10 | Judith Gap High School District / 357 |
| 390. | 55.80 | Luther Elementary School District / 335 |
| 390. | 55.80 | Lennep Elementary School District / 47 |
| 390. | 55.80 | Spring Creek Colony Elementary School District / 37 |
| 393. | 55.90 | Bear Paw Elementary School District / 79 |
| 394. | 56.10 | Trout Creek Elementary School District / 827 |
| 395. | 56.20 | Philipsburg K-12 Schools / 1,557 |
| 396. | 56.30 | Terry K-12 Schools / 1,193 |
| 397. | 56.40 | Gold Creek Elementary School District / 187 |
| 398. | 56.50 | Wise River Elementary School District / 371 |
| 398. | 56.50 | Big Dry Creek Elementary School District / 23 |
| 400. | 56.60 | Dodson High School District / 320 |
| 400. | 56.60 | Paradise Elementary School District / 389 |
| 402. | 56.80 | Upper West Shore Elementary School District / 800 |
| 403. | 56.90 | Swan Valley Elementary School District / 495 |
| 403. | 56.90 | S H Elementary School District / 147 |
| 405. | 57.30 | Grass Range Elementary School District / 410 |
| 405. | 57.30 | Cohagen Elementary School District / 165 |
| 407. | 57.40 | Grass Range High School District / 444 |
| 408. | 57.70 | Springhill Elementary School District / 173 |
| 409. | 57.80 | Yaak Elementary School District / 212 |
| 410. | 58.00 | Melstone Elementary School District / 492 |
| 411. | 58.10 | Ryegate K-12 Schools / 328 |
| 412. | 59.50 | Belfry K-12 Schools / 612 |
| 412. | 59.50 | Polaris Elementary School District / 95 |
| 414. | 60.50 | Pine Grove Elementary School District / 71 |
| 415. | 62.80 | Ovando Elementary School District / 311 |
| 416. | 66.10 | North Harlem Colony Elementary School District / 19 |
| 417. | 69.00 | Ayers Elementary School District / 34 |
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.
*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.
