Somerset is a census-designated place (CDP) and post office located in and governed by Gunnison County, Colorado, United States. The population was 55 at the 2020 census. The Somerset post office has the ZIP Code 81434.

Gunnison County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 16,918. The county seat is Gunnison. The county was named for John W. Gunnison, a United States Army officer and captain in the Army Topographical Engineers, who surveyed for the transcontinental railroad in 1853.