20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| St. George | 1 | 110,270 | 96,039 | 2.65% | 1,429 | 77.15 | City |
| Washington | 2 | 37,371 | 28,636 | 4.9% | 1,034 | 36.13 | City |
| Hurricane | 3 | 26,460 | 20,207 | 4.96% | 502 | 52.74 | City |
| Ivins | 4 | 10,886 | 9,081 | 3.43% | 1,152 | 9.45 | City |
| Santa Clara | 5 | 9,090 | 7,594 | 3.4% | 1,499 | 6.06 | City |
| La Verkin | 6 | 4,618 | 4,347 | 1.18% | 338 | 13.64 | City |
| Enterprise | 7 | 2,445 | 2,055 | 3.29% | 279 | 8.75 | City |
| Toquerville | 8 | 2,026 | 1,885 | 1.4% | 91 | 22.19 | City |
| Hildale | 9 | 1,298 | 1,150 | 2.37% | 143 | 9.05 | City |
| Central | 10 | 974 | 940 | 2.53% | 387 | 2.52 | CDP |
| Apple Valley | 11 | 951 | 863 | 1.93% | 24 | 39.72 | Town |
| Leeds | 12 | 863 | 865 | 0% | 137 | 6.29 | Town |
| Dammeron Valley | 13 | 820 | 738 | 0.12% | 168 | 4.89 | CDP |
| Enterprise | 14 | 814 | 844 | 1.75% | 215 | 3.78 | CDP |
| Virgin | 15 | 722 | 669 | 1.55% | 61 | 11.81 | Town |
| Springdale | 16 | 634 | 521 | 3.76% | 138 | 4.60 | Town |
| Veyo | 17 | 356 | 314 | -2.2% | 172 | 2.07 | CDP |
| Pine Valley | 18 | 341 | 122 | 3.02% | 100 | 3.42 | CDP |
| New Harmony | 19 | 252 | 239 | 1.21% | 396 | 0.64 | Town |
| Rockville | 20 | 221 | 225 | -0.45% | 26 | 8.46 | Town |
St. George is the largest city in Washington County, with a population of 110,270.
Rockville is the smallest city in Washington County.
There are 20 cities in Washington County, Utah.