| Rank | Average Family Size ▼ | School District / Population |
| 1. | 8.00 | Three Creek Joint Elementary School District 416 / 44 |
| 2. | 4.14 | Murtaugh Joint School District 418 / 978 |
| 3. | 3.96 | Snake River School District 52 / 8,486 |
| 4. | 3.89 | West Side Joint School District 202 / 2,485 |
| 5. | 3.87 | Sugar-Salem Joint School District 322 / 5,184 |
| 6. | 3.83 | Dietrich School District 314 / 794 |
| 7. | 3.70 | Aberdeen School District 58 / 3,786 |
| 8. | 3.64 | Jerome Joint School District 261 / 18,905 |
| 9. | 3.60 | Shelley Joint School District 60 / 9,079 |
| 10. | 3.56 | Firth School District 59 / 4,232 |
| 11. | 3.56 | Wendell School District 232 / 4,959 |
| 12. | 3.54 | West Jefferson School District 253 / 2,466 |
| 13. | 3.53 | Madison School District 321 / 32,389 |
| 14. | 3.51 | Hansen School District 415 / 1,642 |
| 15. | 3.51 | Jefferson County Joint School District 251 / 20,613 |
| 16. | 3.50 | Bonneville Joint School District 93 / 42,567 |
| 17. | 3.49 | Vallivue School District 139 / 36,768 |
| 18. | 3.49 | New Plymouth School District 372 / 4,620 |
| 19. | 3.48 | Blackfoot School District 55 / 19,702 |
| 20. | 3.47 | Kuna Joint School District 3 / 21,752 |
| 21. | 3.46 | Kimberly School District 414 / 5,828 |
| 22. | 3.46 | Bruneau-Grand View Joint School District 365 / 2,960 |
| 23. | 3.46 | Nampa School District 131 / 80,521 |
| 24. | 3.45 | Minidoka County Joint School District 331 / 20,216 |
| 25. | 3.45 | Notus School District 135 / 1,574 |
| 26. | 3.45 | Preston Joint School District 201 / 9,758 |
| 27. | 3.44 | Wilder School District 133 / 2,667 |
| 28. | 3.44 | Cassia County Joint School District 151 / 21,673 |
| 29. | 3.41 | Middleton School District 134 / 14,472 |
| 30. | 3.41 | Gooding Joint School District 231 / 6,772 |
| 31. | 3.40 | Fremont County Joint School District 215 / 11,663 |
| 32. | 3.39 | Rockland School District 382 / 566 |
| 33. | 3.38 | Castleford School District 417 / 1,458 |
| 34. | 3.38 | Homedale Joint School District 370 / 5,256 |
| 35. | 3.36 | Ririe Joint School District 252 / 2,317 |
| 36. | 3.35 | Lapwai School District 341 / 2,993 |
| 37. | 3.35 | American Falls Joint School District 381 / 6,911 |
| 38. | 3.35 | Melba Joint School District 136 / 3,059 |
| 39. | 3.34 | Shoshone Joint School District 312 / 3,190 |
| 40. | 3.33 | Caldwell School District 132 / 35,458 |
| 41. | 3.30 | Bliss Joint School District 234 / 856 |
| 42. | 3.30 | Meridian Joint School District 2 / 176,892 |
| 43. | 3.29 | Filer School District 413 / 6,446 |
| 44. | 3.28 | Pocatello School District 25 / 74,353 |
| 45. | 3.28 | Oneida County School District 351 / 4,075 |
| 46. | 3.26 | Idaho Falls School District 91 / 55,676 |
| 47. | 3.25 | Twin Falls School District 411 / 49,765 |
| 48. | 3.25 | Marsh Valley Joint School District 21 / 6,348 |
| 49. | 3.24 | Valley School District 262 / 2,477 |
| 50. | 3.24 | Mountain Home School District 193 / 22,995 |
| 51. | 3.23 | Marsing Joint School District 363 / 3,719 |
| 52. | 3.23 | Fruitland School District 373 / 7,945 |
| 53. | 3.19 | Parma School District 137 / 4,953 |
| 54. | 3.18 | Boundary County School District 101 / 10,792 |
| 55. | 3.17 | Camas County School District 121 / 1,216 |
| 56. | 3.15 | North Gem School District 149 / 847 |
| 57. | 3.14 | Buhl Joint School District 412 / 8,916 |
| 58. | 3.13 | Payette Joint School District 371 / 10,053 |
| 59. | 3.12 | Challis Joint School District 181 / 3,162 |
| 60. | 3.09 | Emmett Independent School District 221 / 16,778 |
| 61. | 3.08 | Weiser School District 431 / 8,456 |
| 62. | 3.08 | Swan Valley Elementary School District 92 / 536 |
| 63. | 3.07 | Kamiah Joint School District 304 / 3,668 |
| 64. | 3.07 | Post Falls School District 273 / 34,675 |
| 65. | 3.06 | Genesee Joint School District 282 / 1,617 |
| 66. | 3.05 | Richfield School District 316 / 860 |
| 67. | 3.05 | Plummer-Worley Joint School District 44 / 3,592 |
| 68. | 3.04 | Nezperce Joint School District 302 / 791 |
| 69. | 3.04 | Lakeland Joint School District 272 / 25,782 |
| 70. | 3.02 | Teton County School District 401 / 9,413 |
| 71. | 2.98 | Culdesac Joint School District 342 / 795 |
| 72. | 2.98 | Hagerman Joint School District 233 / 2,401 |
| 73. | 2.98 | Cottonwood Joint School District 242 / 3,170 |
| 74. | 2.97 | Soda Springs Joint School District 150 / 4,360 |
| 75. | 2.97 | Potlatch School District 285 / 3,244 |
| 76. | 2.97 | Clark County School District 161 / 857 |
| 77. | 2.97 | Lewiston Independent School District 340 / 33,848 |
| 78. | 2.97 | Boise City Independent School District 1 / 184,852 |
| 79. | 2.96 | Glenns Ferry Joint School District 192 / 3,326 |
| 80. | 2.96 | Butte County Joint School District 111 / 2,757 |
| 81. | 2.95 | Horseshoe Bend School District 73 / 1,874 |
| 82. | 2.93 | Troy School District 287 / 1,980 |
| 83. | 2.92 | Pleasant Valley Elementary School District 364 / 176 |
| 84. | 2.91 | Wallace School District 393 / 4,581 |
| 85. | 2.91 | Coeur d'Alene School District 271 / 69,940 |
| 86. | 2.90 | Blaine County School District 61 / 21,329 |
| 87. | 2.87 | Moscow School District 281 / 26,864 |
| 88. | 2.86 | Highland Joint School District 305 / 1,686 |
| 89. | 2.86 | Kendrick Joint School District 283 / 1,942 |
| 90. | 2.85 | Mountain View School District 244 / 9,540 |
| 91. | 2.83 | Meadows Valley School District 11 / 1,318 |
| 92. | 2.81 | Mackay Joint School District 182 / 1,382 |
| 93. | 2.81 | Salmon School District 291 / 7,167 |
| 94. | 2.80 | Kellogg Joint School District 391 / 8,371 |
| 95. | 2.80 | Grace Joint School District 148 / 2,023 |
| 96. | 2.79 | Avery School District 394 / 428 |
| 97. | 2.79 | Basin School District 72 / 3,336 |
| 98. | 2.78 | Council School District 13 / 2,204 |
| 99. | 2.76 | Bear Lake County School District 33 / 5,961 |
| 100. | 2.75 | Cascade School District 422 / 2,695 |
| 101. | 2.75 | Whitepine Joint School District 288 / 1,763 |
| 102. | 2.74 | Mullan School District 392 / 829 |
| 103. | 2.73 | Garden Valley School District 71 / 1,912 |
| 104. | 2.72 | Midvale School District 433 / 590 |
| 105. | 2.72 | West Bonner County School District 83 / 11,920 |
| 106. | 2.72 | McCall-Donnelly Joint School District 421 / 7,178 |
| 107. | 2.70 | St. Maries Joint School District 41 / 6,920 |
| 108. | 2.69 | Orofino Joint School District 171 / 8,981 |
| 109. | 2.68 | Lake Pend Oreille School District 84 / 28,712 |
| 110. | 2.67 | Prairie Elementary School District 191 / 61 |
| 111. | 2.64 | Cambridge Joint School District 432 / 1,189 |
| 112. | 2.62 | Kootenai Joint School District 274 / 2,031 |
| 113. | 2.46 | South Lemhi School District 292 / 512 |
| 114. | 2.39 | Salmon River School District 243 / 1,219 |
| 115. | 2.21 | Arbon Elementary School District 383 / 156 |
Please note that we only rank locations with 'Average Family Size' data. The rank above might not be a complete list. Locations without 'Average Family Size' 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.
