| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| St. George | 1 | 111,344 | 96,032 | 2.42% | 1,438 | 77 | City |
| Washington | 2 | 38,841 | 28,639 | 4.67% | 1,075 | 36 | City |
| Hurricane | 3 | 26,891 | 20,216 | 4.45% | 510 | 53 | City |
| Ivins | 4 | 12,056 | 9,079 | 4.42% | 1,276 | 9 | City |
| Santa Clara | 5 | 8,986 | 7,606 | 3.03% | 1,482 | 6 | City |
| La Verkin | 6 | 4,563 | 4,347 | 1.06% | 334 | 14 | City |
| Enterprise | 7 | 2,533 | 2,051 | 3.6% | 289 | 9 | City |
| Toquerville | 8 | 2,028 | 1,882 | 1.45% | 91 | 22 | City |
| Hildale | 9 | 1,347 | 1,151 | 2.12% | 149 | 9 | City |
| Apple Valley | 10 | 969 | 864 | 1.89% | 24 | 40 | Town |
| Leeds | 11 | 856 | 864 | -0.12% | 136 | 6 | Town |
| Virgin | 12 | 724 | 668 | 1.4% | 61 | 12 | Town |
| Springdale | 13 | 621 | 521 | 3.16% | 135 | 5 | Town |
| New Harmony | 14 | 252 | 238 | 0.8% | 396 | 1 | Town |
| Rockville | 15 | 224 | 227 | -0.44% | 26 | 8 | Town |
St. George is the largest city in Washington County, with a population of 111,344.
Rockville is the smallest city in Washington County, with a population of 224.
There are 15 cities in Washington County, Utah.