| Rank | Median Age ▲ | School District / Population |
| 1. | 21.70 | Madison School District 321 / 33,962 |
| 2. | 23.70 | Moscow School District 281 / 27,674 |
| 3. | 27.30 | Mountain Home School District 193 / 24,083 |
| 4. | 27.80 | West Jefferson School District 253 / 2,470 |
| 5. | 28.30 | Vallivue School District 139 / 32,010 |
| 6. | 28.80 | Sugar-Salem Joint School District 322 / 4,208 |
| 7. | 29.00 | Bonneville Joint School District 93 / 40,252 |
| 8. | 29.10 | Pocatello School District 25 / 73,921 |
| 9. | 29.70 | Shelley Joint School District 60 / 8,875 |
| 10. | 29.90 | Jefferson County Joint School District 251 / 18,839 |
| 11. | 30.20 | Nampa School District 131 / 79,480 |
| 11. | 30.20 | Aberdeen School District 58 / 4,107 |
| 11. | 30.20 | Wendell School District 232 / 4,959 |
| 11. | 30.20 | Murtaugh Joint School District 418 / 986 |
| 15. | 30.40 | Snake River School District 52 / 8,116 |
| 16. | 30.70 | Caldwell School District 132 / 35,670 |
| 17. | 30.80 | West Side Joint School District 202 / 2,535 |
| 17. | 30.80 | Jerome Joint School District 261 / 17,576 |
| 19. | 31.70 | Preston Joint School District 201 / 9,466 |
| 20. | 31.90 | Kuna Joint School District 3 / 20,922 |
| 21. | 32.10 | Fremont County Joint School District 215 / 11,387 |
| 22. | 32.40 | Blackfoot School District 55 / 19,457 |
| 23. | 32.50 | Idaho Falls School District 91 / 53,769 |
| 24. | 32.70 | Three Creek Joint Elementary School District 416 / 31 |
| 25. | 32.80 | Castleford School District 417 / 1,539 |
| 26. | 32.90 | Twin Falls School District 411 / 47,581 |
| 26. | 32.90 | Shoshone Joint School District 312 / 2,810 |
| 28. | 33.10 | Post Falls School District 273 / 34,426 |
| 29. | 33.60 | Teton County School District 401 / 8,422 |
| 30. | 33.70 | Meridian Joint School District 2 / 167,895 |
| 30. | 33.70 | New Plymouth School District 372 / 4,817 |
| 30. | 33.70 | American Falls Joint School District 381 / 7,161 |
| 33. | 33.90 | Hansen School District 415 / 1,715 |
| 33. | 33.90 | Cassia County Joint School District 151 / 20,487 |
| 35. | 34.00 | Avery School District 394 / 369 |
| 36. | 34.30 | Marsing Joint School District 363 / 3,432 |
| 37. | 34.40 | Boise City Independent School District 1 / 182,560 |
| 38. | 34.60 | Dietrich School District 314 / 697 |
| 39. | 34.80 | Middleton School District 134 / 14,292 |
| 40. | 35.20 | Richfield School District 316 / 925 |
| 40. | 35.20 | Bruneau-Grand View Joint School District 365 / 2,901 |
| 42. | 35.30 | Payette Joint School District 371 / 10,015 |
| 43. | 35.70 | Notus School District 135 / 1,634 |
| 44. | 35.90 | Minidoka County Joint School District 331 / 19,602 |
| 45. | 36.50 | North Gem School District 149 / 837 |
| 46. | 36.80 | Rockland School District 382 / 527 |
| 47. | 36.90 | Filer School District 413 / 6,551 |
| 47. | 36.90 | Parma School District 137 / 4,894 |
| 49. | 37.40 | Ririe Joint School District 252 / 2,455 |
| 50. | 37.60 | Lapwai School District 341 / 2,812 |
| 51. | 37.80 | Marsh Valley Joint School District 21 / 6,507 |
| 52. | 38.10 | Clark County School District 161 / 984 |
| 53. | 38.20 | Homedale Joint School District 370 / 5,315 |
| 53. | 38.20 | Oneida County School District 351 / 4,024 |
| 55. | 38.60 | Wilder School District 133 / 2,578 |
| 56. | 38.80 | Blaine County School District 61 / 21,775 |
| 57. | 38.90 | Coeur d'Alene School District 271 / 69,030 |
| 57. | 38.90 | Soda Springs Joint School District 150 / 4,462 |
| 59. | 39.30 | Fruitland School District 373 / 7,802 |
| 60. | 39.40 | Valley School District 262 / 2,756 |
| 61. | 39.90 | Kimberly School District 414 / 5,563 |
| 61. | 39.90 | Glenns Ferry Joint School District 192 / 4,206 |
| 63. | 40.00 | Firth School District 59 / 3,885 |
| 63. | 40.00 | Bear Lake County School District 33 / 5,771 |
| 65. | 40.20 | Lewiston Independent School District 340 / 33,761 |
| 66. | 40.40 | Buhl Joint School District 412 / 8,637 |
| 67. | 40.60 | Lakeland Joint School District 272 / 25,538 |
| 68. | 40.70 | Kamiah Joint School District 304 / 3,839 |
| 69. | 41.00 | Grace Joint School District 148 / 1,982 |
| 69. | 41.00 | Camas County School District 121 / 1,040 |
| 71. | 41.10 | Weiser School District 431 / 8,353 |
| 72. | 41.20 | Emmett Independent School District 221 / 16,355 |
| 73. | 41.30 | Melba Joint School District 136 / 3,192 |
| 74. | 41.40 | Gooding Joint School District 231 / 6,079 |
| 74. | 41.40 | Potlatch School District 285 / 3,145 |
| 76. | 41.70 | Horseshoe Bend School District 73 / 1,853 |
| 77. | 41.90 | Mullan School District 392 / 936 |
| 77. | 41.90 | McCall-Donnelly Joint School District 421 / 6,187 |
| 79. | 42.10 | Boundary County School District 101 / 10,748 |
| 80. | 42.30 | Bliss Joint School District 234 / 642 |
| 81. | 42.50 | Challis Joint School District 181 / 3,197 |
| 82. | 42.80 | Troy School District 287 / 2,069 |
| 83. | 43.00 | Nezperce Joint School District 302 / 833 |
| 83. | 43.00 | Basin School District 72 / 3,638 |
| 85. | 43.40 | Kendrick Joint School District 283 / 2,041 |
| 86. | 43.70 | Lake Pend Oreille School District 84 / 29,554 |
| 87. | 43.80 | Meadows Valley School District 11 / 1,152 |
| 88. | 43.90 | Kellogg Joint School District 391 / 8,688 |
| 89. | 44.00 | St. Maries Joint School District 41 / 6,960 |
| 90. | 44.10 | Plummer-Worley Joint School District 44 / 3,516 |
| 91. | 44.20 | Butte County Joint School District 111 / 2,668 |
| 91. | 44.20 | Prairie Elementary School District 191 / 145 |
| 93. | 44.30 | Cottonwood Joint School District 242 / 2,933 |
| 94. | 44.90 | Genesee Joint School District 282 / 1,543 |
| 95. | 45.50 | West Bonner County School District 83 / 11,224 |
| 96. | 45.60 | Council School District 13 / 2,007 |
| 97. | 46.00 | Whitepine Joint School District 288 / 1,733 |
| 98. | 47.10 | Highland Joint School District 305 / 1,666 |
| 98. | 47.10 | Salmon School District 291 / 7,040 |
| 100. | 47.20 | Orofino Joint School District 171 / 8,550 |
| 101. | 47.80 | Culdesac Joint School District 342 / 734 |
| 102. | 47.90 | Cambridge Joint School District 432 / 1,156 |
| 103. | 48.00 | Mountain View School District 244 / 9,115 |
| 104. | 48.20 | Pleasant Valley Elementary School District 364 / 181 |
| 105. | 48.30 | Mackay Joint School District 182 / 1,280 |
| 106. | 48.50 | Wallace School District 393 / 4,033 |
| 107. | 48.60 | Midvale School District 433 / 648 |
| 107. | 48.60 | Hagerman Joint School District 233 / 2,412 |
| 109. | 49.60 | Kootenai Joint School District 274 / 2,105 |
| 110. | 49.70 | Cascade School District 422 / 2,528 |
| 111. | 49.80 | Arbon Elementary School District 383 / 111 |
| 112. | 50.40 | South Lemhi School District 292 / 531 |
| 113. | 51.30 | Garden Valley School District 71 / 1,976 |
| 114. | 53.70 | Swan Valley Elementary School District 92 / 606 |
| 115. | 59.90 | Salmon River School District 243 / 944 |
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.
