| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Tooele County | 1 | 18.39% | 86,839 | 73,351 |
| Washington County | 2 | 17.1% | 213,151 | 182,029 |
| Iron County | 3 | 16.77% | 67,387 | 57,711 |
| Utah County | 4 | 15.9% | 769,109 | 663,606 |
| Juab County | 5 | 14.81% | 13,578 | 11,826 |
| Rich County | 6 | 13.38% | 2,839 | 2,504 |
| Box Elder County | 7 | 12.79% | 65,362 | 57,948 |
| Kane County | 8 | 11.91% | 8,604 | 7,688 |
| Cache County | 9 | 10.59% | 147,781 | 133,629 |
| Wasatch County | 10 | 9.55% | 38,413 | 35,063 |
| Sanpete County | 11 | 8.73% | 31,014 | 28,524 |
| Uintah County | 12 | 8.51% | 38,711 | 35,675 |
| Duchesne County | 13 | 7.34% | 21,065 | 19,625 |
| Beaver County | 14 | 6.62% | 7,557 | 7,088 |
| Morgan County | 15 | 6.43% | 13,182 | 12,386 |
| Weber County | 16 | 6.29% | 279,550 | 263,001 |
| Piute County | 17 | 5.84% | 1,522 | 1,438 |
| Davis County | 18 | 5.15% | 382,510 | 363,768 |
| Sevier County | 19 | 5.14% | 22,673 | 21,564 |
| Millard County | 20 | 5.03% | 13,712 | 13,055 |
| Wayne County | 21 | 3.87% | 2,603 | 2,506 |
| Salt Lake County | 22 | 3.79% | 1,232,004 | 1,187,028 |
| Emery County | 23 | 3.3% | 10,173 | 9,848 |
| Garfield County | 24 | 3.18% | 5,260 | 5,098 |
| San Juan County | 25 | 2.03% | 14,812 | 14,518 |
| Summit County | 26 | 1.87% | 43,279 | 42,485 |
| Grand County | 27 | 0.86% | 9,766 | 9,683 |
| Carbon County | 28 | 0.68% | 20,619 | 20,480 |
| Daggett County | 29 | -2.42% | 929 | 952 |
Utah's counties show varied growth patterns from 2020 to 2025. Tooele County leads with 18.39% annualized growth, followed by Washington County (17.1%) and Iron County (16.77%). The largest counties are Salt Lake County (1,232,004), Utah County (769,109), and Davis County (382,510). Of the 29 counties in Utah, 28 are growing while just 1 has experienced population decline. Overall, counties averaged 7.7% annualized growth, with total population growing by 8.52% annually.
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