| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Tooele County | 1 | 21.59% | 89,190 | 73,351 |
| Washington County | 2 | 19.96% | 218,359 | 182,029 |
| Iron County | 3 | 19.28% | 68,838 | 57,711 |
| Utah County | 4 | 19.19% | 790,984 | 663,606 |
| Juab County | 5 | 17.19% | 13,859 | 11,826 |
| Rich County | 6 | 16.85% | 2,926 | 2,504 |
| Box Elder County | 7 | 14.94% | 66,604 | 57,948 |
| Kane County | 8 | 12.94% | 8,683 | 7,688 |
| Cache County | 9 | 12.31% | 150,075 | 133,629 |
| Wasatch County | 10 | 11.14% | 38,968 | 35,063 |
| Sanpete County | 11 | 9.72% | 31,296 | 28,524 |
| Uintah County | 12 | 9.64% | 39,115 | 35,675 |
| Duchesne County | 13 | 8.67% | 21,327 | 19,625 |
| Beaver County | 14 | 8.49% | 7,690 | 7,088 |
| Weber County | 15 | 7.6% | 282,982 | 263,001 |
| Morgan County | 16 | 7.15% | 13,271 | 12,386 |
| Davis County | 17 | 6.26% | 386,550 | 363,768 |
| Millard County | 18 | 6.1% | 13,852 | 13,055 |
| Sevier County | 19 | 5.85% | 22,826 | 21,564 |
| Salt Lake County | 20 | 5.11% | 1,247,734 | 1,187,028 |
| Piute County | 21 | 5.01% | 1,510 | 1,438 |
| Wayne County | 22 | 3.67% | 2,598 | 2,506 |
| San Juan County | 23 | 3.48% | 15,023 | 14,518 |
| Emery County | 24 | 3.42% | 10,185 | 9,848 |
| Garfield County | 25 | 2.59% | 5,230 | 5,098 |
| Summit County | 26 | 2.27% | 43,449 | 42,485 |
| Carbon County | 27 | 0.71% | 20,625 | 20,480 |
| Grand County | 28 | 0.63% | 9,744 | 9,683 |
| Daggett County | 29 | -5.25% | 902 | 952 |
Utah's counties show varied growth patterns from 2020 to 2026. Tooele County leads with 3.31% annualized growth, followed by Washington County (3.08%) and Iron County (2.98%). The largest counties are Salt Lake County (1,247,734), Utah County (790,984), and Davis County (386,550). Of the 29 counties in Utah, 28 are growing while just 1 has experienced population decline. Overall, counties averaged 1.4% annualized growth, with total population growing by 1.66% annually.
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