| Rank | Average Family Size ▼ | School District / Population |
| 1. | 3.07 | Jefferson County School District / 53,498 |
| 2. | 3.04 | Berkeley County School District / 104,169 |
| 3. | 3.00 | Clay County School District / 9,386 |
| 4. | 2.94 | Boone County School District / 24,629 |
| 5. | 2.93 | Putnam County School District / 55,486 |
| 6. | 2.92 | Wayne County School District / 42,481 |
| 6. | 2.92 | Lincoln County School District / 21,720 |
| 6. | 2.92 | Harrison County School District / 69,099 |
| 9. | 2.91 | Mingo County School District / 26,839 |
| 9. | 2.91 | Hampshire County School District / 23,964 |
| 11. | 2.90 | Pleasants County School District / 7,605 |
| 11. | 2.90 | Wyoming County School District / 23,796 |
| 11. | 2.90 | Logan County School District / 36,743 |
| 14. | 2.89 | Roane County School District / 14,926 |
| 14. | 2.89 | Taylor County School District / 16,895 |
| 14. | 2.89 | Barbour County School District / 16,589 |
| 14. | 2.89 | Mason County School District / 27,324 |
| 18. | 2.88 | Upshur County School District / 24,254 |
| 18. | 2.88 | Jackson County School District / 29,211 |
| 18. | 2.88 | Webster County School District / 9,154 |
| 21. | 2.87 | Mineral County School District / 28,212 |
| 21. | 2.87 | Raleigh County School District / 78,859 |
| 21. | 2.87 | Monongalia School District / 96,189 |
| 21. | 2.87 | Fayette County School District / 46,039 |
| 21. | 2.87 | Doddridge County School District / 8,202 |
| 26. | 2.86 | Braxton County School District / 14,523 |
| 26. | 2.86 | Ohio County School District / 44,443 |
| 26. | 2.86 | McDowell County School District / 22,113 |
| 26. | 2.86 | Hardy County School District / 14,025 |
| 30. | 2.85 | Ritchie County School District / 10,449 |
| 30. | 2.85 | Wood County School District / 86,956 |
| 30. | 2.85 | Monroe County School District / 13,502 |
| 30. | 2.85 | Cabell County School District / 96,319 |
| 30. | 2.85 | Nicholas County School District / 26,233 |
| 30. | 2.85 | Marshall County School District / 33,107 |
| 30. | 2.85 | Marion County School District / 56,418 |
| 37. | 2.84 | Morgan County School District / 17,541 |
| 37. | 2.84 | Kanawha County School District / 193,063 |
| 37. | 2.84 | Grant County School District / 11,937 |
| 37. | 2.84 | Lewis County School District / 16,372 |
| 37. | 2.84 | Preston County School District / 33,520 |
| 37. | 2.84 | Tyler County School District / 9,208 |
| 43. | 2.83 | Gilmer County School District / 8,693 |
| 43. | 2.83 | Wetzel County School District / 16,583 |
| 43. | 2.83 | Mercer County School District / 62,264 |
| 43. | 2.83 | Brooke County School District / 24,069 |
| 47. | 2.82 | Wirt County School District / 5,717 |
| 48. | 2.81 | Randolph County School District / 29,405 |
| 49. | 2.80 | Pendleton County School District / 7,695 |
| 49. | 2.80 | Hancock County School District / 30,676 |
| 49. | 2.80 | Calhoun County School District / 7,627 |
| 52. | 2.79 | Greenbrier County School District / 35,480 |
| 52. | 2.79 | Summers County School District / 13,927 |
| 54. | 2.77 | Tucker County School District / 7,141 |
| 55. | 2.75 | Pocahontas County School District / 8,719 |
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.
