Somerset is an unincorporated community, coal mining town and a U.S. Post Office located in Gunnison County, Colorado, United States. The Somerset Post Office has the ZIP Code 81434.The community was named after Somerset, Pennsylvania.Somerset is located at 38°55′35″N 107°28′11″W / 38.92639°N 107.46972°W / 38.92639; -107.46972.