6 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Silverthorne | 1 | 5,604 | 4,451 | 3.55% | 1,380 | 4 | Town |
| Breckenridge | 2 | 4,810 | 5,056 | -0.85% | 796 | 6 | Town |
| Frisco | 3 | 2,637 | 2,922 | -1.75% | 1,579 | 2 | Town |
| Dillon | 4 | 987 | 1,065 | -1.3% | 665 | 1 | Town |
| Blue River | 5 | 819 | 870 | -0.97% | 336 | 2 | Town |
| Montezuma | 6 | 69 | 75 | -1.43% | 873 | 0 | Town |
Silverthorne is the largest city in Summit County, with a population of 5,604.
Montezuma is the smallest city in Summit County, with a population of 69.
There are 6 cities in Summit County, Colorado.