| Rank | Median Age ▲ | School District / Population |
| 1. | 13.80 | Ross Elementary School District / 40 |
| 2. | 15.20 | Yellowstone Academy Elementary School District / 67 |
| 3. | 18.50 | North Harlem Colony Elementary School District / 34 |
| 4. | 19.00 | Lustre Elementary School District / 251 |
| 5. | 20.50 | Auchard Creek Elementary School District / 95 |
| 6. | 21.50 | Plenty Coups High School District / 1,019 |
| 6. | 21.50 | Pryor Elementary School District / 1,019 |
| 8. | 21.80 | Lame Deer Elementary School District / 2,928 |
| 9. | 22.80 | Brockton Elementary School District / 996 |
| 9. | 22.80 | Brockton High School District / 996 |
| 11. | 24.20 | Rocky Boy Elementary School District / 2,801 |
| 12. | 24.50 | Liberty Elementary School District / 114 |
| 13. | 25.50 | Harlem Elementary School District / 2,608 |
| 14. | 25.80 | Heart Butte K-12 Schools / 772 |
| 14. | 25.80 | Pendroy Elementary School District / 323 |
| 16. | 25.90 | Lame Deer High School District / 5,207 |
| 16. | 25.90 | Harlem High School District / 2,696 |
| 18. | 26.10 | Lodge Grass Elementary School District / 1,654 |
| 19. | 27.90 | Rocky Boy High School District / 1,613 |
| 19. | 27.90 | Lennep Elementary School District / 61 |
| 21. | 28.50 | Frazer High School District / 668 |
| 21. | 28.50 | Whitewater K-12 Schools / 125 |
| 23. | 28.60 | Browning Elementary School District / 8,273 |
| 24. | 28.80 | Lodge Grass High School District / 2,242 |
| 24. | 28.80 | Wolf Point Elementary School District / 3,666 |
| 24. | 28.80 | Browning High School District / 9,084 |
| 27. | 28.90 | Wolf Point High School District / 4,225 |
| 27. | 28.90 | Frazer Elementary School District / 417 |
| 29. | 29.00 | Greycliff Elementary School District / 239 |
| 30. | 29.50 | Bozeman Elementary School District / 51,052 |
| 31. | 29.80 | South Stacey Elementary School District / 126 |
| 32. | 29.90 | Ashland Elementary School District / 1,144 |
| 33. | 30.10 | Big Sandy High School District / 2,556 |
| 34. | 30.50 | Frontier Elementary School District / 559 |
| 35. | 30.70 | Missoula Elementary School District / 68,124 |
| 36. | 30.80 | Hays-Lodge Pole K-12 Schools / 1,083 |
| 36. | 30.80 | Bozeman High School District / 58,415 |
| 38. | 31.00 | Poplar Elementary School District / 3,124 |
| 38. | 31.00 | Poplar High School District / 3,124 |
| 40. | 31.10 | Warrick Elementary School District / 19 |
| 41. | 31.50 | Dixon Elementary School District / 679 |
| 42. | 31.60 | Sand Springs Elementary School District / 130 |
| 43. | 31.70 | Belgrade Elementary School District / 19,900 |
| 44. | 31.90 | Belgrade High School District / 20,130 |
| 45. | 32.00 | Charlo High School District / 2,230 |
| 46. | 32.10 | East Glacier Park Elementary School District / 811 |
| 47. | 32.80 | Missoula High School District / 98,293 |
| 48. | 33.20 | Ronan Elementary School District / 8,214 |
| 48. | 33.20 | Ronan High School District / 8,214 |
| 48. | 33.20 | Charlo Elementary School District / 1,551 |
| 51. | 34.10 | St. Ignatius K-12 Schools / 3,124 |
| 52. | 34.20 | Morin Elementary School District / 513 |
| 53. | 34.40 | Miami Elementary School District / 135 |
| 54. | 34.70 | Hardin Elementary School District / 8,883 |
| 54. | 34.70 | Hardin High School District / 7,844 |
| 54. | 34.70 | Springdale Elementary School District / 157 |
| 57. | 35.10 | Havre Elementary School District / 12,351 |
| 58. | 35.30 | Havre High School District / 12,707 |
| 59. | 35.40 | Arlee High School District / 2,488 |
| 59. | 35.40 | Bonner Elementary School District / 2,588 |
| 59. | 35.40 | Kalispell Elementary School District / 27,570 |
| 59. | 35.40 | Arlee Elementary School District / 2,488 |
| 59. | 35.40 | Lolo Elementary School District / 4,621 |
| 64. | 35.50 | Lockwood Elementary School District / 7,589 |
| 65. | 35.60 | Malmborg Elementary School District / 227 |
| 65. | 35.60 | Smith Valley Elementary School District / 1,980 |
| 67. | 35.70 | Twin Buttes Elementary School District / 84 |
| 68. | 36.30 | Ophir Elementary School District / 1,478 |
| 69. | 36.60 | Basin Elementary School District / 180 |
| 70. | 37.00 | Denton Elementary School District / 686 |
| 71. | 37.20 | Boulder Elementary School District / 2,429 |
| 72. | 37.40 | Pioneer Elementary School District / 1,126 |
| 72. | 37.40 | Hellgate Elementary School District / 12,009 |
| 74. | 37.70 | Evergreen Elementary School District / 6,321 |
| 74. | 37.70 | Denton High School District / 721 |
| 74. | 37.70 | Billings Elementary School District / 104,812 |
| 74. | 37.70 | Gildford Colony Elementary School District / 132 |
| 78. | 37.80 | Billings High School District / 125,086 |
| 79. | 37.90 | Laurel Elementary School District / 11,231 |
| 80. | 38.00 | Great Falls Elementary School District / 71,164 |
| 80. | 38.00 | Deer Creek Elementary School District / 1,591 |
| 80. | 38.00 | Great Falls High School District / 71,219 |
| 83. | 38.20 | Ulm Elementary School District / 737 |
| 84. | 38.30 | Laurel High School District / 10,728 |
| 85. | 38.40 | Willow Creek Elementary School District / 364 |
| 86. | 38.50 | Columbia Falls High School District / 14,488 |
| 86. | 38.50 | Fairview Elementary School District / 1,430 |
| 86. | 38.50 | Columbia Falls Elementary School District / 14,042 |
| 89. | 38.60 | Avon Elementary School District / 243 |
| 89. | 38.60 | Independent Elementary School District / 2,926 |
| 91. | 38.70 | Willow Creek High School District / 316 |
| 92. | 38.80 | Name N/A / 866,873 |
| 92. | 38.80 | Culbertson Elementary School District / 1,139 |
| 92. | 38.80 | Dillon Elementary School District / 7,639 |
| 95. | 39.00 | Culbertson High School District / 1,027 |
| 95. | 39.00 | Flathead High School District / 55,349 |
| 97. | 39.10 | East Helena Elementary School District / 8,718 |
| 98. | 39.20 | Cut Bank High School District / 4,167 |
| 98. | 39.20 | Cut Bank Elementary School District / 4,167 |
| 100. | 39.40 | Valley View Elementary School District / 361 |
| 100. | 39.40 | Shelby Elementary School District / 3,688 |
| 100. | 39.40 | Blue Creek Elementary School District / 2,472 |
| 103. | 39.50 | Lambert High School District / 440 |
| 104. | 39.60 | Colstrip High School District / 2,520 |
| 104. | 39.60 | Melstone High School District / 307 |
| 104. | 39.60 | Greenfield Elementary School District / 704 |
| 104. | 39.60 | Colstrip Elementary School District / 2,520 |
| 108. | 39.70 | Elder Grove Elementary School District / 2,725 |
| 109. | 40.00 | Amsterdam Elementary School District / 1,708 |
| 110. | 40.10 | Elysian Elementary School District / 713 |
| 110. | 40.10 | Wyola Elementary School District / 588 |
| 112. | 40.20 | Monforton Elementary School District / 1,953 |
| 112. | 40.20 | Fair-Mont-Egan Elementary School District / 1,273 |
| 114. | 40.30 | Garrison Elementary School District / 142 |
| 114. | 40.30 | Miles City Elementary School District / 9,973 |
| 114. | 40.30 | Fairview High School District / 1,439 |
| 117. | 40.40 | Helena High School District / 59,916 |
| 117. | 40.40 | Helena Elementary School District / 49,204 |
| 117. | 40.40 | Bainville K-12 Schools / 412 |
| 117. | 40.40 | Park City Elementary School District / 2,431 |
| 117. | 40.40 | Bloomfield Elementary School District / 115 |
| 122. | 40.70 | Park City High School District / 2,226 |
| 123. | 40.80 | Savage High School District / 520 |
| 123. | 40.80 | Savage Elementary School District / 522 |
| 125. | 41.10 | Shelby High School District / 3,940 |
| 125. | 41.10 | McLeod Elementary School District / 277 |
| 127. | 41.20 | Highwood Elementary School District / 562 |
| 128. | 41.40 | West Yellowstone K-12 School District / 1,770 |
| 128. | 41.40 | Butte Elementary School District / 32,463 |
| 130. | 41.50 | Helena Flats Elementary School District / 1,568 |
| 130. | 41.50 | De Smet Elementary School District / 559 |
| 132. | 41.60 | Clinton Elementary School District / 2,044 |
| 132. | 41.60 | Winnett K-12 Schools / 598 |
| 134. | 41.70 | Lambert Elementary School District / 435 |
| 134. | 41.70 | Gardiner Elementary School District / 1,809 |
| 136. | 41.80 | Spring Creek Elementary School District / 61 |
| 136. | 41.80 | Butte High School District / 33,769 |
| 136. | 41.80 | Custer County High School District / 11,548 |
| 139. | 41.90 | Manhattan High School District / 4,322 |
| 139. | 41.90 | Florence-Carlton K-12 Schools / 5,760 |
| 139. | 41.90 | Victor K-12 Schools / 3,668 |
| 139. | 41.90 | Noxon Elementary School District / 1,534 |
| 143. | 42.10 | Moore High School District / 483 |
| 143. | 42.10 | Moore Elementary School District / 483 |
| 143. | 42.10 | Beaverhead County High School District / 8,678 |
| 143. | 42.10 | Harrison K-12 Schools / 783 |
| 147. | 42.20 | Gardiner High School District / 1,881 |
| 148. | 42.30 | Power Elementary School District / 520 |
| 148. | 42.30 | Molt Elementary School District / 183 |
| 148. | 42.30 | West Valley Elementary School District / 3,567 |
| 148. | 42.30 | Lavina K-12 Schools / 476 |
| 152. | 42.40 | Manhattan Elementary School District / 2,579 |
| 152. | 42.40 | Sidney Elementary School District / 6,474 |
| 154. | 42.50 | Stevensville Elementary School District / 7,061 |
| 154. | 42.50 | Townsend K-12 Schools / 4,841 |
| 154. | 42.50 | Ringling Elementary School District / 82 |
| 154. | 42.50 | Dawson High School District / 8,432 |
| 158. | 42.60 | Creston Elementary School District / 1,205 |
| 158. | 42.60 | Shepherd High School District / 3,261 |
| 158. | 42.60 | Broadview High School District / 952 |
| 158. | 42.60 | Shepherd Elementary School District / 3,261 |
| 158. | 42.60 | Cottonwood Elementary School District / 171 |
| 163. | 42.70 | Sidney High School District / 7,099 |
| 164. | 42.80 | Stevensville High School District / 10,237 |
| 164. | 42.80 | Canyon Creek Elementary School District / 2,143 |
| 166. | 42.90 | Three Forks High School District / 2,930 |
| 166. | 42.90 | Baker K-12 Schools / 2,360 |
| 168. | 43.00 | Power High School District / 526 |
| 168. | 43.00 | Glendive Elementary School District / 6,406 |
| 168. | 43.00 | Shawmut Elementary School District / 108 |
| 168. | 43.00 | Three Forks Elementary School District / 2,958 |
| 172. | 43.10 | Big Sandy Elementary School District / 1,349 |
| 172. | 43.10 | Broadview Elementary School District / 867 |
| 174. | 43.20 | White Sulphur Springs High School District / 2,024 |
| 174. | 43.20 | Belt High School District / 2,003 |
| 174. | 43.20 | Livingston Elementary School District / 10,375 |
| 177. | 43.30 | Belt Elementary School District / 1,997 |
| 177. | 43.30 | Dodson Elementary School District / 286 |
| 179. | 43.40 | White Sulphur Springs Elementary School District / 1,881 |
| 180. | 43.50 | Whitefish Elementary School District / 13,487 |
| 180. | 43.50 | Valier Elementary School District / 1,156 |
| 180. | 43.50 | Deer Lodge Elementary School District / 5,602 |
| 183. | 43.60 | Valier High School District / 1,467 |
| 183. | 43.60 | Whitefish High School District / 14,045 |
| 185. | 43.70 | Lone Rock Elementary School District / 3,176 |
| 185. | 43.70 | Kila Elementary School District / 1,536 |
| 187. | 43.80 | Dupuyer Elementary School District / 311 |
| 187. | 43.80 | Elliston Elementary School District / 281 |
| 187. | 43.80 | Columbus High School District / 3,742 |
| 190. | 43.90 | Gallatin Gateway Elementary School District / 1,579 |
| 190. | 43.90 | Woodman Elementary School District / 557 |
| 190. | 43.90 | Conrad High School District / 3,514 |
| 193. | 44.00 | Columbus Elementary School District / 3,537 |
| 193. | 44.00 | Kinsey Elementary School District / 420 |
| 193. | 44.00 | Somers Elementary School District / 5,135 |
| 193. | 44.00 | Centerville High School District / 1,597 |
| 197. | 44.10 | Centerville Elementary School District / 1,658 |
| 197. | 44.10 | Circle Elementary School District / 1,202 |
| 197. | 44.10 | Conrad Elementary School District / 3,379 |
| 200. | 44.20 | Helmville Elementary School District / 330 |
| 200. | 44.20 | Roy K-12 Schools / 297 |
| 200. | 44.20 | Park High School District / 12,485 |
| 203. | 44.30 | Highwood High School District / 530 |
| 203. | 44.30 | Corvallis K-12 Schools / 7,173 |
| 205. | 44.40 | West Glacier Elementary School District / 446 |
| 205. | 44.40 | Hinsdale Elementary School District / 422 |
| 205. | 44.40 | Powell County High School District / 7,198 |
| 205. | 44.40 | Seeley Lake Elementary School District / 1,746 |
| 209. | 44.50 | S Y Elementary School District / 50 |
| 209. | 44.50 | Reichle Elementary School District / 91 |
| 209. | 44.50 | Choteau High School District / 3,127 |
| 212. | 44.60 | Jefferson High School District / 7,975 |
| 213. | 44.70 | Huntley Project K-12 Schools / 3,646 |
| 214. | 45.00 | Gold Creek Elementary School District / 274 |
| 214. | 45.00 | Sweet Grass County High School District / 3,632 |
| 214. | 45.00 | Hawks Home Elementary School District / 122 |
| 217. | 45.10 | Glasgow K-12 Schools / 4,913 |
| 218. | 45.20 | Montana City Elementary School District / 2,554 |
| 218. | 45.20 | Sunburst K-12 Schools / 1,203 |
| 218. | 45.20 | Target Range Elementary School District / 4,158 |
| 221. | 45.30 | Fortine Elementary School District / 812 |
| 222. | 45.40 | Cottonwood Elementary School District / 319 |
| 222. | 45.40 | Fairfield High School District / 1,832 |
| 222. | 45.40 | Olney-Bissell Elementary School District / 949 |
| 222. | 45.40 | Hysham K-12 Schools / 848 |
| 226. | 45.50 | Dodson High School District / 341 |
| 226. | 45.50 | Swan River Elementary School District / 1,682 |
| 226. | 45.50 | Box Elder High School District / 416 |
| 226. | 45.50 | Box Elder Elementary School District / 416 |
| 226. | 45.50 | Jordan Elementary School District / 702 |
| 226. | 45.50 | Eureka Elementary School District / 4,721 |
| 232. | 45.60 | Geraldine High School District / 635 |
| 232. | 45.60 | Noxon High School District / 2,415 |
| 232. | 45.60 | Red Lodge Elementary School District / 3,324 |
| 235. | 45.70 | Hall Elementary School District / 253 |
| 235. | 45.70 | La Motte Elementary School District / 764 |
| 235. | 45.70 | Frenchtown K-12 Schools / 6,181 |
| 238. | 45.80 | Bridger K-12 Schools / 1,382 |
| 238. | 45.80 | Chinook Elementary School District / 1,947 |
| 238. | 45.80 | Drummond High School District / 1,320 |
| 238. | 45.80 | Lindsay Elementary School District / 407 |
| 242. | 45.90 | Drummond Elementary School District / 1,067 |
| 242. | 45.90 | Ayers Elementary School District / 17 |
| 244. | 46.00 | Cottonwood Elementary School District / 215 |
| 244. | 46.00 | Powder River County High School District / 1,659 |
| 244. | 46.00 | Trail Creek Elementary School District / 48 |
| 244. | 46.00 | Anaconda Elementary School District / 9,079 |
| 248. | 46.10 | Vaughn Elementary School District / 962 |
| 248. | 46.10 | Lincoln County High School District / 6,260 |
| 250. | 46.20 | Red Lodge High School District / 3,838 |
| 250. | 46.20 | Choteau Elementary School District / 2,584 |
| 252. | 46.30 | Anaconda High School District / 9,149 |
| 253. | 46.40 | Fromberg K-12 Schools / 1,262 |
| 253. | 46.40 | Brorson Elementary School District / 227 |
| 253. | 46.40 | Circle High School District / 1,714 |
| 256. | 46.50 | Garfield County High School District / 1,224 |
| 256. | 46.50 | Polson Elementary School District / 9,910 |
| 256. | 46.50 | Cayuse Prairie Elementary School District / 2,698 |
| 259. | 46.60 | Geraldine Elementary School District / 595 |
| 260. | 46.70 | Simms High School District / 3,223 |
| 260. | 46.70 | Trego Elementary School District / 727 |
| 260. | 46.70 | Anderson Elementary School District / 1,147 |
| 260. | 46.70 | Chinook High School District / 2,332 |
| 260. | 46.70 | Alberton K-12 Schools / 1,167 |
| 265. | 46.80 | Zurich Elementary School District / 284 |
| 265. | 46.80 | Pass Creek Elementary School District / 86 |
| 265. | 46.80 | Forsyth Elementary School District / 2,502 |
| 268. | 46.90 | Roberts K-12 Schools / 597 |
| 268. | 46.90 | Hinsdale High School District / 474 |
| 270. | 47.00 | Polson High School District / 10,969 |
| 270. | 47.00 | Augusta High School District / 689 |
| 270. | 47.00 | Sun River Valley Elementary School District / 2,261 |
| 270. | 47.00 | Big Timber Elementary School District / 2,860 |
| 274. | 47.10 | North Star High School District / 1,156 |
| 274. | 47.10 | Superior K-12 Schools / 2,443 |
| 274. | 47.10 | Fergus High School District / 9,230 |
| 274. | 47.10 | Lewistown Elementary School District / 9,022 |
| 274. | 47.10 | King Colony Elementary School District / 199 |
| 279. | 47.20 | Chester-Joplin-Inverness High School District / 2,376 |
| 279. | 47.20 | Sunset Elementary School District / 185 |
| 281. | 47.30 | Malta K-12 Schools / 3,380 |
| 281. | 47.30 | Knees Elementary School District / 107 |
| 281. | 47.30 | Broadus Elementary School District / 1,290 |
| 281. | 47.30 | Forsyth High School District / 2,555 |
| 281. | 47.30 | Melstone Elementary School District / 520 |
| 281. | 47.30 | Plevna K-12 Schools / 453 |
| 281. | 47.30 | Deerfield Elementary School District / 35 |
| 281. | 47.30 | Fairfield Elementary School District / 956 |
| 281. | 47.30 | Trinity Elementary School District / 1,408 |
| 290. | 47.40 | Winifred K-12 Schools / 302 |
| 290. | 47.40 | Ramsay Elementary School District / 1,075 |
| 290. | 47.40 | Cardwell Elementary School District / 421 |
| 293. | 47.60 | North Star Elementary School District / 997 |
| 293. | 47.60 | Scobey K-12 Schools / 1,492 |
| 295. | 47.70 | Fishtail Elementary School District / 363 |
| 296. | 47.90 | Twin Bridges K-12 Schools / 1,501 |
| 296. | 47.90 | Melville Elementary School District / 198 |
| 296. | 47.90 | Whitehall High School District / 3,638 |
| 299. | 48.00 | Whitehall Elementary School District / 3,161 |
| 299. | 48.00 | Chester-Joplin-Inverness Elementary School District / 2,233 |
| 299. | 48.00 | Rau Elementary School District / 294 |
| 299. | 48.00 | Golden Ridge Elementary School District / 178 |
| 303. | 48.10 | Ennis K-12 Schools / 2,975 |
| 303. | 48.10 | Darby K-12 Schools / 3,584 |
| 305. | 48.20 | Rapelje Elementary School District / 289 |
| 305. | 48.20 | Birney Elementary School District / 117 |
| 307. | 48.30 | Divide Elementary School District / 157 |
| 308. | 48.40 | Wibaux K-12 Schools / 1,067 |
| 309. | 48.50 | Spring Creek Elementary School District / 80 |
| 309. | 48.50 | Kester Elementary School District / 26 |
| 311. | 48.60 | Nashua K-12 Schools / 905 |
| 312. | 48.80 | Kircher Elementary School District / 696 |
| 312. | 48.80 | Deep Creek Elementary School District / 133 |
| 314. | 48.90 | Libby K-12 Schools / 9,742 |
| 314. | 48.90 | Richey Elementary School District / 418 |
| 314. | 48.90 | Potomac Elementary School District / 1,164 |
| 314. | 48.90 | Augusta Elementary School District / 594 |
| 314. | 48.90 | Cooke City Elementary School District / 72 |
| 319. | 49.00 | Joliet High School District / 2,347 |
| 319. | 49.00 | Rapelje High School District / 387 |
| 319. | 49.00 | Luther Elementary School District / 444 |
| 322. | 49.10 | Richey High School District / 501 |
| 322. | 49.10 | Medicine Lake K-12 Schools / 761 |
| 322. | 49.10 | Clancy Elementary School District / 2,812 |
| 325. | 49.20 | Bynum Elementary School District / 220 |
| 326. | 49.30 | Biddle Elementary School District / 121 |
| 326. | 49.30 | Cascade High School District / 2,520 |
| 326. | 49.30 | Hamilton K-12 Schools / 10,976 |
| 329. | 49.40 | St. Regis K-12 Schools / 1,256 |
| 329. | 49.40 | McCormick Elementary School District / 395 |
| 329. | 49.40 | Deer Park Elementary School District / 1,018 |
| 329. | 49.40 | Arrowhead Elementary School District / 1,625 |
| 333. | 49.50 | Shields Valley High School District / 1,625 |
| 333. | 49.50 | Shields Valley Elementary School District / 1,625 |
| 335. | 49.60 | Absarokee Elementary School District / 1,599 |
| 336. | 49.70 | Roundup Elementary School District / 3,881 |
| 337. | 49.80 | Wisdom Elementary School District / 325 |
| 337. | 49.80 | Thompson Falls Elementary School District / 3,463 |
| 337. | 49.80 | Roundup High School District / 4,041 |
| 337. | 49.80 | Harlowton High School District / 1,908 |
| 337. | 49.80 | Absarokee High School District / 2,124 |
| 337. | 49.80 | Thompson Falls High School District / 3,463 |
| 343. | 49.90 | Plentywood K-12 Schools / 2,392 |
| 343. | 49.90 | Swan Lake-Salmon Elementary School District / 293 |
| 345. | 50.10 | Reedpoint High School District / 502 |
| 345. | 50.10 | Turner High School District / 361 |
| 345. | 50.10 | Turner Elementary School District / 361 |
| 345. | 50.10 | Harlowton Elementary School District / 1,800 |
| 349. | 50.50 | Plains Elementary School District / 2,934 |
| 349. | 50.50 | Lincoln K-12 Schools / 1,038 |
| 351. | 50.70 | Joliet Elementary School District / 1,844 |
| 352. | 50.90 | Troy Elementary School District / 2,786 |
| 352. | 50.90 | Vida Elementary School District / 512 |
| 354. | 51.00 | Bigfork High School District / 8,219 |
| 354. | 51.00 | Ekalaka Elementary School District / 992 |
| 354. | 51.00 | Carter County High School District / 1,289 |
| 357. | 51.10 | Camas Prairie Elementary School District / 216 |
| 357. | 51.10 | Jackson Elementary School District / 115 |
| 359. | 51.30 | Hobson K-12 Schools / 751 |
| 359. | 51.30 | Benton Lake Elementary School District / 65 |
| 361. | 51.40 | Springhill Elementary School District / 159 |
| 362. | 51.50 | Reedpoint Elementary School District / 555 |
| 362. | 51.50 | Trout Creek Elementary School District / 881 |
| 364. | 51.70 | Belfry K-12 Schools / 568 |
| 364. | 51.70 | Dutton/Brady K-12 Schools / 1,012 |
| 364. | 51.70 | Plains High School District / 3,254 |
| 367. | 51.90 | Landusky Elementary School District / 55 |
| 367. | 51.90 | Custer K-12 Schools / 445 |
| 367. | 51.90 | Bigfork Elementary School District / 6,349 |
| 367. | 51.90 | Grass Range High School District / 422 |
| 371. | 52.00 | Hot Springs High School District / 1,572 |
| 371. | 52.00 | Westby K-12 Schools / 352 |
| 373. | 52.20 | Troy High School District / 3,505 |
| 373. | 52.20 | Alder Elementary School District / 292 |
| 375. | 52.30 | Marion Elementary School District / 994 |
| 375. | 52.30 | Whitlash Elementary School District / 29 |
| 375. | 52.30 | Geyser Elementary School District / 208 |
| 375. | 52.30 | Cascade Elementary School District / 1,650 |
| 379. | 52.40 | Pleasant Valley Elementary School District / 93 |
| 380. | 52.70 | Hot Springs Elementary School District / 1,356 |
| 380. | 52.70 | Fort Benton High School District / 2,044 |
| 382. | 52.80 | Stanford K-12 Schools / 887 |
| 383. | 53.00 | Davey Elementary School District / 64 |
| 384. | 53.20 | Sheridan High School District / 1,910 |
| 385. | 53.30 | Fort Benton Elementary School District / 1,766 |
| 386. | 53.40 | Saco High School District / 360 |
| 386. | 53.40 | Philipsburg K-12 Schools / 1,724 |
| 388. | 53.70 | Saco Elementary School District / 412 |
| 388. | 53.70 | Lima K-12 Schools / 454 |
| 390. | 53.80 | Sheridan Elementary School District / 1,618 |
| 390. | 53.80 | Bear Paw Elementary School District / 101 |
| 392. | 53.90 | Wise River Elementary School District / 357 |
| 393. | 54.20 | Van Norman Elementary School District / 97 |
| 394. | 54.30 | Galata Elementary School District / 252 |
| 395. | 54.50 | Grass Range Elementary School District / 405 |
| 395. | 54.50 | Geyser High School District / 317 |
| 397. | 55.00 | Cleveland Elementary School District / 54 |
| 398. | 55.10 | Carter Elementary School District / 114 |
| 398. | 55.10 | Wolf Creek Elementary School District / 586 |
| 400. | 55.20 | Pine Grove Elementary School District / 79 |
| 401. | 55.50 | Nye Elementary School District / 232 |
| 401. | 55.50 | Terry K-12 Schools / 1,089 |
| 403. | 55.70 | S H Elementary School District / 112 |
| 404. | 55.90 | Alzada Elementary School District / 175 |
| 405. | 56.10 | Ryegate K-12 Schools / 334 |
| 405. | 56.10 | Peerless K-12 Schools / 157 |
| 407. | 56.30 | Froid Elementary School District / 489 |
| 407. | 56.30 | Yaak Elementary School District / 185 |
| 407. | 56.30 | Froid High School District / 489 |
| 410. | 56.40 | Spring Creek Colony Elementary School District / 9 |
| 411. | 56.50 | Pine Creek Elementary School District / 333 |
| 412. | 56.70 | Cohagen Elementary School District / 79 |
| 412. | 56.70 | Grant Elementary School District / 120 |
| 414. | 57.20 | Opheim K-12 Schools / 385 |
| 415. | 57.50 | Rosebud High School District / 371 |
| 416. | 57.80 | Swan Valley Elementary School District / 433 |
| 416. | 57.80 | Big Dry Creek Elementary School District / 41 |
| 418. | 57.90 | Sylvanite Elementary School District / 139 |
| 419. | 58.20 | Melrose Elementary School District / 74 |
| 419. | 58.20 | Rosebud Elementary School District / 355 |
| 421. | 58.50 | Paradise Elementary School District / 320 |
| 422. | 58.70 | Raynesford Elementary School District / 109 |
| 423. | 59.00 | Polaris Elementary School District / 101 |
| 424. | 59.20 | Upper West Shore Elementary School District / 698 |
| 425. | 59.30 | Judith Gap High School District / 280 |
| 425. | 59.30 | Judith Gap Elementary School District / 280 |
| 427. | 63.00 | Ovando Elementary School District / 326 |
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.
