The Town of Breckenridge is the home rule municipality that is the county seat and the most populous municipality of Summit County, Colorado, United States. The town population was 5,078 at the 2020 United States Census. Breckenridge is the principal town of the Breckenridge, CO Micropolitan Statistical Area. The town also has many part-time residents, as many people have vacation homes in the area. The town is located at the base of the Tenmile Range. Since ski trails were first cut in 1961, Breckenridge Ski Resort has made the town a popular destination for skiers. Summer in Breckenridge attracts outdoor enthusiasts with hiking trails, wildflowers, fly-fishing in the Blue River, mountain biking, nearby Lake Dillon for boating, white water rafting, three alpine slides, a roller coaster, and many shops and restaurants up and down Main Street. The historic buildings along Main Street with their clapboard and log exteriors add to the charm of the town. Since 1981, Breckenridge hosts the Breckenridge Festival of Film in September. In January each year since the 21st century there is a Backcountry Film Festival. That is held at about the same time as the Ullr Fest, a week of celebrating snow and honoring the Norse god Ullr. There are many summer activities, including an annual Fourth of July parade.

For people with the surname, see Silverthorne (surname). Silverthorne is the second most populous town in Summit County, Colorado. According to the 2010 Census, the population of the city is 3,887. It is a home rule municipality.

The Town of Frisco is a home rule municipality located in Summit County, Colorado, United States. Frisco is a part of the Breckenridge, CO Micropolitan Statistical Area. The population was 2,683 at the 2010 census. It is a popular town among skiers from around the world. Four major ski resorts are located in close proximity to Frisco: Copper Mountain, Breckenridge, Keystone, and Arapahoe Basin.

The City of Idaho Springs is the Statutory City that is the most populous municipality in Clear Creek County, Colorado, United States. Idaho Springs is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. As of the 2010 census it had a population of 1,717. Idaho Springs is located in Clear Creek Canyon, in the mountains upstream from Golden, some 30 miles (50 km) west of Denver. Founded 162 years ago in 1859 by prospectors during the early days of the Pike's Peak Gold Rush, the town was at the center of the region's mining district throughout the late nineteenth century. The Argo Tunnel drained and provided access to many lodes of ore between Idaho Springs and Central City. During the late twentieth century, the town evolved into a tourist center along U.S. Highway 6 and U.S. Highway 40, which ascend Clear Creek Canyon through the historic mining district. The town today is squeezed along the north side of Interstate 70, with a historical downtown in the central portion, a strip of tourist-related businesses on its eastern end, and mostly residences on its western end. It also serves as a bedroom community for workers at the Loveland Ski Area farther up the canyon. The town today is the largest community in Clear Creek County, but, for historical reasons, the county seat has remained at Georgetown.