| Rank | Average Family Size ▼ | School District / Population |
| 1. | 4.52 | San Juan School District / 14,636 |
| 2. | 4.22 | Rich School District / 2,285 |
| 3. | 4.17 | Piute School District / 1,921 |
| 4. | 4.14 | Alpine School District / 301,887 |
| 5. | 4.06 | Nebo School District / 124,097 |
| 6. | 4.00 | Jordan School District / 237,214 |
| 7. | 3.87 | Juab School District / 9,572 |
| 8. | 3.80 | Cache School District / 67,021 |
| 9. | 3.79 | Wasatch School District / 25,550 |
| 10. | 3.78 | Granite School District / 391,562 |
| 11. | 3.73 | Morgan School District / 9,955 |
| 12. | 3.73 | Davis School District / 317,646 |
| 13. | 3.71 | Tooele School District / 59,973 |
| 14. | 3.69 | Uintah School District / 34,576 |
| 15. | 3.62 | Iron School District / 46,725 |
| 16. | 3.60 | Provo School District / 114,441 |
| 17. | 3.60 | South Sanpete School District / 16,036 |
| 18. | 3.57 | North Sanpete School District / 12,093 |
| 19. | 3.56 | South Summit School District / 7,462 |
| 20. | 3.56 | Beaver School District / 6,514 |
| 21. | 3.54 | Canyons School District / 209,984 |
| 22. | 3.54 | Box Elder School District / 50,613 |
| 23. | 3.51 | Weber School District / 152,540 |
| 24. | 3.50 | Ogden School District / 83,767 |
| 25. | 3.49 | Washington School District / 144,844 |
| 26. | 3.48 | Millard School District / 12,582 |
| 27. | 3.45 | North Summit School District / 5,519 |
| 28. | 3.43 | Salt Lake City School District / 189,267 |
| 29. | 3.43 | Sevier School District / 20,812 |
| 30. | 3.41 | Emery School District / 10,834 |
| 31. | 3.38 | Garfield School District / 5,105 |
| 32. | 3.36 | Logan School District / 48,933 |
| 33. | 3.34 | Grand School District / 9,656 |
| 34. | 3.29 | Wayne School District / 2,742 |
| 35. | 3.28 | Carbon School District / 21,118 |
| 36. | 3.26 | Park City School District / 24,896 |
| 37. | 3.25 | Duchesne School District / 19,378 |
| 38. | 3.25 | Murray School District / 35,643 |
| 39. | 3.16 | Kane School District / 7,221 |
| 40. | 2.90 | Tintic School District / 777 |
| 41. | 2.69 | Daggett School District / 714 |
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.
