| Rank | Average Family Size ▼ | School District / Population |
| 1. | 3.63 | Hampshire County School District / 23,674 |
| 2. | 3.55 | Doddridge County School District / 8,282 |
| 3. | 3.53 | Hardy County School District / 13,955 |
| 4. | 3.50 | Mineral County School District / 27,912 |
| 5. | 3.47 | Morgan County School District / 17,450 |
| 6. | 3.42 | Grant County School District / 11,829 |
| 7. | 3.33 | Monongalia School District / 100,332 |
| 8. | 3.32 | Lincoln County School District / 21,599 |
| 9. | 3.27 | Barbour County School District / 16,723 |
| 10. | 3.26 | Ritchie County School District / 10,221 |
| 11. | 3.20 | Upshur County School District / 24,487 |
| 12. | 3.19 | Jackson County School District / 29,229 |
| 13. | 3.18 | Jefferson County School District / 54,650 |
| 14. | 3.18 | Wayne County School District / 41,735 |
| 15. | 3.18 | Roane County School District / 14,749 |
| 16. | 3.17 | Berkeley County School District / 107,324 |
| 17. | 3.17 | Gilmer County School District / 8,706 |
| 18. | 3.15 | Harrison County School District / 69,069 |
| 19. | 3.13 | Clay County School District / 9,226 |
| 20. | 3.13 | Braxton County School District / 14,492 |
| 21. | 3.11 | Marion County School District / 56,698 |
| 22. | 3.10 | Putnam County School District / 56,356 |
| 23. | 3.09 | Fayette County School District / 45,709 |
| 24. | 3.09 | Wyoming County School District / 23,203 |
| 25. | 3.08 | McDowell County School District / 21,281 |
| 26. | 3.07 | Lewis County School District / 16,412 |
| 27. | 3.06 | Wood County School District / 86,595 |
| 28. | 3.05 | Wetzel County School District / 16,314 |
| 29. | 3.03 | Randolph County School District / 29,446 |
| 30. | 3.03 | Cabell County School District / 96,826 |
| 31. | 3.03 | Preston County School District / 33,720 |
| 32. | 3.03 | Mercer County School District / 62,161 |
| 33. | 3.02 | Mason County School District / 27,207 |
| 34. | 3.02 | Boone County School District / 24,257 |
| 35. | 3.02 | Pleasants County School District / 7,600 |
| 36. | 3.01 | Tyler County School District / 9,084 |
| 37. | 3.00 | Ohio County School District / 43,956 |
| 38. | 2.99 | Raleigh County School District / 78,827 |
| 39. | 2.99 | Logan County School District / 36,169 |
| 40. | 2.98 | Calhoun County School District / 7,583 |
| 41. | 2.98 | Kanawha County School District / 191,765 |
| 42. | 2.97 | Taylor County School District / 16,969 |
| 43. | 2.95 | Pendleton County School District / 7,525 |
| 44. | 2.94 | Tucker County School District / 6,996 |
| 45. | 2.94 | Hancock County School District / 30,369 |
| 46. | 2.93 | Nicholas County School District / 26,090 |
| 47. | 2.93 | Mingo County School District / 26,229 |
| 48. | 2.93 | Greenbrier County School District / 35,639 |
| 49. | 2.87 | Brooke County School District / 23,787 |
| 50. | 2.85 | Marshall County School District / 32,716 |
| 51. | 2.84 | Summers County School District / 13,699 |
| 52. | 2.84 | Wirt County School District / 5,810 |
| 53. | 2.82 | Monroe County School District / 13,524 |
| 54. | 2.82 | Pocahontas County School District / 8,710 |
| 55. | 2.81 | Webster County School District / 9,005 |
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.
