Belchertown (previously known as Cold Spring and Belcher's Town) is a town in Hampshire County, Massachusetts, United States. It is part of the Springfield, Massachusetts Metropolitan Statistical Area. The population was 12,968 at the 2000 census. It is the home of Belchertown High School, the infamous Belchertown State School mental institution (closed in 1992), and Boivin Racing. Part of the town is part of the census-designated place of Belchertown.