| Rank | Median Age ▲ | School District / Population |
| 1. | 22.90 | Madison School District 321 / 34,270 |
| 2. | 24.90 | Sugar-Salem Joint School District 322 / 5,157 |
| 3. | 25.30 | Moscow School District 281 / 27,847 |
| 4. | 26.90 | West Side Joint School District 202 / 2,521 |
| 5. | 29.50 | Snake River School District 52 / 8,013 |
| 5. | 29.50 | Bonneville Joint School District 93 / 48,297 |
| 7. | 29.90 | Mountain Home School District 193 / 23,778 |
| 8. | 30.50 | Murtaugh Joint School District 418 / 1,006 |
| 9. | 30.60 | West Jefferson School District 253 / 2,288 |
| 9. | 30.60 | Wendell School District 232 / 4,731 |
| 11. | 30.70 | Caldwell School District 132 / 33,356 |
| 12. | 30.90 | Vallivue School District 139 / 41,596 |
| 13. | 31.00 | Dietrich School District 314 / 750 |
| 13. | 31.00 | Jefferson County Joint School District 251 / 22,305 |
| 15. | 31.20 | Jerome Joint School District 261 / 19,462 |
| 16. | 31.70 | Cassia County Joint School District 151 / 23,023 |
| 17. | 31.80 | Pocatello School District 25 / 77,277 |
| 18. | 32.10 | Kuna Joint School District 3 / 27,555 |
| 19. | 32.20 | Nampa School District 131 / 86,317 |
| 20. | 32.40 | Wilder School District 133 / 2,911 |
| 20. | 32.40 | Clark County School District 161 / 823 |
| 22. | 32.60 | Shelley Joint School District 60 / 9,350 |
| 23. | 33.00 | Firth School District 59 / 4,016 |
| 24. | 33.40 | Preston Joint School District 201 / 10,114 |
| 24. | 33.40 | Kimberly School District 414 / 6,710 |
| 24. | 33.40 | Twin Falls School District 411 / 52,427 |
| 27. | 33.50 | Blackfoot School District 55 / 21,546 |
| 27. | 33.50 | Aberdeen School District 58 / 3,630 |
| 29. | 33.90 | Idaho Falls School District 91 / 56,089 |
| 30. | 34.00 | Castleford School District 417 / 1,458 |
| 31. | 34.20 | American Falls Joint School District 381 / 7,076 |
| 32. | 34.30 | Richfield School District 316 / 1,162 |
| 32. | 34.30 | Ririe Joint School District 252 / 2,693 |
| 34. | 34.50 | Melba Joint School District 136 / 3,414 |
| 34. | 34.50 | Grace Joint School District 148 / 2,271 |
| 34. | 34.50 | Shoshone Joint School District 312 / 2,953 |
| 37. | 34.70 | Teton County School District 401 / 10,212 |
| 38. | 34.90 | North Gem School District 149 / 778 |
| 38. | 34.90 | Bruneau-Grand View Joint School District 365 / 2,380 |
| 40. | 35.00 | Hansen School District 415 / 2,013 |
| 41. | 35.20 | Minidoka County Joint School District 331 / 20,681 |
| 42. | 35.50 | Meridian Joint School District 2 / 194,641 |
| 42. | 35.50 | New Plymouth School District 372 / 5,072 |
| 44. | 35.70 | Post Falls School District 273 / 37,025 |
| 45. | 36.20 | Middleton School District 134 / 16,127 |
| 45. | 36.20 | Boise City Independent School District 1 / 190,168 |
| 47. | 36.90 | Homedale Joint School District 370 / 5,839 |
| 48. | 37.10 | Fremont County Joint School District 215 / 11,351 |
| 48. | 37.10 | Gooding Joint School District 231 / 6,910 |
| 50. | 37.20 | Valley School District 262 / 3,038 |
| 50. | 37.20 | Parma School District 137 / 5,468 |
| 52. | 37.50 | Cottonwood Joint School District 242 / 2,743 |
| 53. | 37.80 | Genesee Joint School District 282 / 1,685 |
| 54. | 37.90 | Filer School District 413 / 6,747 |
| 54. | 37.90 | Rockland School District 382 / 557 |
| 56. | 38.30 | Marsing Joint School District 363 / 4,421 |
| 57. | 38.40 | Fruitland School District 373 / 8,244 |
| 58. | 38.80 | Bear Lake County School District 33 / 5,816 |
| 59. | 39.20 | Payette Joint School District 371 / 9,408 |
| 60. | 39.50 | Lapwai School District 341 / 3,327 |
| 61. | 39.70 | Oneida County School District 351 / 4,241 |
| 61. | 39.70 | Notus School District 135 / 1,804 |
| 63. | 40.00 | Coeur d'Alene School District 271 / 74,669 |
| 64. | 40.20 | Soda Springs Joint School District 150 / 4,193 |
| 64. | 40.20 | Camas County School District 121 / 1,156 |
| 66. | 40.30 | Troy School District 287 / 2,130 |
| 66. | 40.30 | South Lemhi School District 292 / 690 |
| 68. | 40.80 | Weiser School District 431 / 8,591 |
| 69. | 40.90 | Lewiston Independent School District 340 / 34,319 |
| 70. | 41.00 | Bliss Joint School District 234 / 924 |
| 71. | 41.20 | Buhl Joint School District 412 / 8,559 |
| 71. | 41.20 | Lakeland Joint School District 272 / 26,689 |
| 73. | 41.30 | Three Creek Joint Elementary School District 416 / 72 |
| 74. | 41.40 | Avery School District 394 / 537 |
| 75. | 42.40 | Blaine County School District 61 / 21,269 |
| 76. | 42.60 | Potlatch School District 285 / 3,477 |
| 77. | 43.30 | Plummer-Worley Joint School District 44 / 3,905 |
| 78. | 43.50 | Horseshoe Bend School District 73 / 1,585 |
| 78. | 43.50 | Boundary County School District 101 / 10,903 |
| 80. | 43.80 | Emmett Independent School District 221 / 16,732 |
| 81. | 43.90 | Glenns Ferry Joint School District 192 / 2,368 |
| 82. | 44.40 | Marsh Valley Joint School District 21 / 6,110 |
| 83. | 44.50 | Kellogg Joint School District 391 / 8,222 |
| 84. | 44.70 | Hagerman Joint School District 233 / 2,830 |
| 85. | 45.30 | Nezperce Joint School District 302 / 918 |
| 85. | 45.30 | Butte County Joint School District 111 / 2,630 |
| 87. | 45.80 | McCall-Donnelly Joint School District 421 / 6,772 |
| 87. | 45.80 | Lake Pend Oreille School District 84 / 29,227 |
| 89. | 46.10 | Mullan School District 392 / 668 |
| 90. | 46.50 | St. Maries Joint School District 41 / 6,744 |
| 91. | 46.90 | Culdesac Joint School District 342 / 922 |
| 92. | 47.30 | Kendrick Joint School District 283 / 1,872 |
| 93. | 47.50 | Prairie Elementary School District 191 / 73 |
| 94. | 47.90 | Whitepine Joint School District 288 / 1,670 |
| 95. | 48.00 | West Bonner County School District 83 / 11,658 |
| 96. | 48.20 | Kamiah Joint School District 304 / 3,858 |
| 97. | 48.60 | Challis Joint School District 181 / 2,854 |
| 98. | 49.20 | Meadows Valley School District 11 / 1,221 |
| 99. | 49.80 | Mackay Joint School District 182 / 1,604 |
| 100. | 50.00 | Mountain View School District 244 / 10,197 |
| 101. | 50.40 | Orofino Joint School District 171 / 8,859 |
| 102. | 50.70 | Basin School District 72 / 3,500 |
| 103. | 50.90 | Cascade School District 422 / 2,923 |
| 104. | 51.10 | Wallace School District 393 / 4,302 |
| 105. | 51.20 | Salmon School District 291 / 7,068 |
| 106. | 51.40 | Cambridge Joint School District 432 / 1,173 |
| 107. | 52.20 | Highland Joint School District 305 / 1,334 |
| 108. | 53.00 | Council School District 13 / 2,195 |
| 109. | 53.60 | Kootenai Joint School District 274 / 1,814 |
| 110. | 54.20 | Swan Valley Elementary School District 92 / 619 |
| 111. | 55.30 | Garden Valley School District 71 / 1,795 |
| 112. | 55.80 | Salmon River School District 243 / 1,390 |
| 113. | 56.70 | Arbon Elementary School District 383 / 180 |
| 114. | 62.00 | Midvale School District 433 / 530 |
| 115. | 64.20 | Pleasant Valley Elementary School District 364 / 76 |
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.
