18 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Summit Park | 1 | 8,941 | 8,177 | 0.87% | 662 | 14 | CDP |
| Park City | 2 | 8,146 | 8,416 | -0.66% | 366 | 22 | City |
| Snyderville | 3 | 5,759 | 5,995 | 0.16% | 530 | 11 | CDP |
| East Basin | 4 | 4,558 | 3,486 | 7.15% | 507 | 9 | CDP |
| Kamas | 5 | 2,167 | 2,112 | 0.51% | 555 | 4 | City |
| Francis | 6 | 1,947 | 1,601 | 3.67% | 505 | 4 | Town |
| Coalville | 7 | 1,561 | 1,490 | 0.9% | 253 | 6 | City |
| Oakley | 8 | 1,546 | 1,595 | -0.64% | 219 | 7 | City |
| Silver Summit | 9 | 1,221 | 1,256 | -11.65% | 109 | 11 | CDP |
| Hoytsville | 10 | 810 | 524 | 1.76% | 180 | 5 | CDP |
| Henefer | 11 | 799 | 838 | -0.99% | 324 | 2 | Town |
| Marion | 12 | 600 | 721 | -0.99% | 125 | 5 | CDP |
| Bear River | 13 | 534 | 519 | 0.56% | 276 | 2 | Town |
| Woodland | 14 | 503 | 199 | 2.24% | 243 | 2 | CDP |
| Wanship | 15 | 300 | 481 | -2.28% | 59 | 5 | CDP |
| Echo | 16 | 99 | 44 | 7.61% | 121 | 1 | CDP |
| Samak | 17 | 81 | 98 | -13.83% | 33 | 2 | CDP |
| Peoa | 18 | 46 | 183 | -22.03% | 13 | 3 | CDP |
Summit Park is the largest city in Summit County, with a population of 8,941.
Peoa is the smallest city in Summit County, with a population of 46.
There are 18 cities in Summit County, Utah.