15 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| St. George | 1 | 111,407 | 96,050 | 2.35% | 1,439 | 77 | City |
| Washington | 2 | 38,932 | 28,638 | 4.61% | 1,078 | 36 | City |
| Hurricane | 3 | 27,023 | 20,212 | 4.38% | 512 | 53 | City |
| Ivins | 4 | 12,122 | 9,079 | 4.37% | 1,283 | 9 | City |
| Santa Clara | 5 | 9,148 | 7,596 | 2.91% | 1,509 | 6 | City |
| La Verkin | 6 | 4,620 | 4,347 | 1.01% | 339 | 14 | City |
| Enterprise | 7 | 2,572 | 2,056 | 3.46% | 294 | 9 | City |
| Toquerville | 8 | 2,050 | 1,885 | 1.38% | 92 | 22 | City |
| Hildale | 9 | 1,316 | 1,151 | 2.17% | 145 | 9 | City |
| Apple Valley | 10 | 965 | 862 | 1.79% | 24 | 40 | Town |
| Leeds | 11 | 858 | 864 | -0.12% | 136 | 6 | Town |
| Virgin | 12 | 728 | 667 | 1.39% | 62 | 12 | Town |
| Springdale | 13 | 632 | 521 | 3.1% | 138 | 5 | Town |
| New Harmony | 14 | 253 | 238 | 1.2% | 398 | 1 | Town |
| Rockville | 15 | 221 | 226 | -0.45% | 26 | 8 | Town |
St. George is the largest city in Washington County, with a population of 111,407.
Rockville is the smallest city in Washington County, with a population of 221.
There are 15 cities in Washington County, Utah.