Founded on 1861-11-01, Summit County is one of 64 counties in the state of Colorado. The city of Breckenridge is the county seat. With FIPS code of 117, Summit County has a population of 30,941 and area of 618.92 square miles (1,603 km2).
List of all cities in Summit County, CO alphabetically
| City/Town | Postal Code | Area Code |
| Breckenridge, CO | 80424 | 970 |
| Copper Mountain, CO | 80443 | 970 |
| Dillon, CO | 80435 | 970 |
| Frisco, CO | 80443 | 970 |
| Heeney, CO | 80498 | 970 |
| Keystone, CO | 80435 | 970 |
| Montezuma, CO | 80435 | 970 |
| Silverthorne, CO | 80497 | 970 |
| 80498 | 970 |
Map of Cities in Summit County, CO
