| Rank | Average Family Size ▼ | School District / Population |
| 1. | 4.00 | Alpine School District / 284,505 |
| 2. | 3.97 | Nebo School District / 119,571 |
| 3. | 3.85 | Jordan School District / 218,793 |
| 4. | 3.80 | Juab School District / 9,367 |
| 5. | 3.77 | San Juan School District / 14,746 |
| 6. | 3.75 | Cache School District / 64,634 |
| 7. | 3.67 | Morgan School District / 9,469 |
| 8. | 3.64 | Tooele School District / 58,218 |
| 9. | 3.63 | Davis School District / 306,479 |
| 10. | 3.59 | South Sanpete School District / 16,448 |
| 10. | 3.59 | Wasatch School District / 23,530 |
| 12. | 3.53 | Granite School District / 385,194 |
| 13. | 3.50 | Box Elder School District / 49,975 |
| 13. | 3.50 | North Sanpete School District / 11,374 |
| 13. | 3.50 | Uintah School District / 32,588 |
| 16. | 3.47 | Duchesne School District / 18,607 |
| 17. | 3.44 | Beaver School District / 6,629 |
| 18. | 3.43 | Iron School District / 46,163 |
| 19. | 3.42 | Millard School District / 12,503 |
| 19. | 3.42 | Weber School District / 148,422 |
| 21. | 3.41 | Provo School District / 112,488 |
| 22. | 3.39 | South Summit School District / 7,001 |
| 22. | 3.39 | Canyons School District / 204,224 |
| 24. | 3.37 | North Summit School District / 4,922 |
| 25. | 3.36 | Ogden School District / 82,814 |
| 25. | 3.36 | Washington School District / 138,115 |
| 25. | 3.36 | Emery School District / 10,976 |
| 28. | 3.35 | Sevier School District / 20,802 |
| 29. | 3.25 | Salt Lake City School District / 186,440 |
| 30. | 3.24 | Logan School District / 48,022 |
| 31. | 3.23 | Wayne School District / 2,778 |
| 32. | 3.22 | Rich School District / 2,264 |
| 33. | 3.19 | Garfield School District / 5,172 |
| 34. | 3.18 | Piute School District / 1,556 |
| 35. | 3.16 | Tintic School District / 879 |
| 35. | 3.16 | Murray School District / 35,004 |
| 37. | 3.14 | Park City School District / 24,401 |
| 37. | 3.14 | Carbon School District / 21,403 |
| 39. | 3.04 | Kane School District / 7,125 |
| 40. | 2.92 | Grand School District / 9,225 |
| 41. | 2.91 | Daggett School District / 1,059 |
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.
