| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Tooele County | 1 | 22.83% | 90,094 | 73,349 |
| Washington County | 2 | 20.28% | 218,909 | 182,002 |
| Iron County | 3 | 19.1% | 68,723 | 57,703 |
| Juab County | 4 | 16.83% | 13,810 | 11,821 |
| Utah County | 5 | 16.65% | 774,050 | 663,576 |
| Box Elder County | 6 | 15.03% | 66,655 | 57,944 |
| Kane County | 7 | 13.07% | 8,703 | 7,697 |
| Sanpete County | 8 | 12.26% | 32,025 | 28,528 |
| Wasatch County | 9 | 11.75% | 39,179 | 35,061 |
| Morgan County | 10 | 10.26% | 13,656 | 12,385 |
| Millard County | 11 | 8.79% | 14,201 | 13,053 |
| Cache County | 12 | 8.75% | 145,333 | 133,636 |
| Uintah County | 13 | 7.64% | 38,402 | 35,676 |
| Duchesne County | 14 | 7.23% | 21,036 | 19,617 |
| Sevier County | 15 | 7% | 23,062 | 21,554 |
| Weber County | 16 | 6.52% | 280,131 | 262,989 |
| Davis County | 17 | 5.56% | 383,992 | 363,766 |
| Rich County | 18 | 5.23% | 2,634 | 2,503 |
| Emery County | 19 | 3.74% | 10,212 | 9,844 |
| Salt Lake County | 20 | 3.15% | 1,224,378 | 1,187,009 |
| Wayne County | 21 | 2.4% | 2,565 | 2,505 |
| Piute County | 22 | 2.15% | 1,471 | 1,440 |
| Beaver County | 23 | 2.13% | 7,240 | 7,089 |
| Grand County | 24 | 2.03% | 9,880 | 9,683 |
| Garfield County | 25 | 1.68% | 5,191 | 5,105 |
| Carbon County | 26 | 1.34% | 20,760 | 20,485 |
| Summit County | 27 | 1.3% | 43,032 | 42,478 |
| San Juan County | 28 | 0.44% | 14,585 | 14,521 |
| Daggett County | 29 | -3.68% | 916 | 951 |
Utah's counties show varied growth patterns from 2020 to 2026. Tooele County leads with 3.49% annualized growth, followed by Washington County (3.13%) and Iron County (2.96%). The largest counties are Salt Lake County (1,224,378), Utah County (774,050), and Davis County (383,992). Of the 29 counties in Utah, 28 are growing while just 1 has experienced population decline. Overall, counties averaged 1.26% annualized growth, with total population growing by 1.42% annually.
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