Williamstown is a town in Berkshire County, in the northwest corner of Massachusetts, United States. It shares a border with Vermont to the north and New York to the west. It is part of the Pittsfield, Massachusetts Metropolitan Statistical Area. The population was 7,754 at the 2010 census. A college town, it is home to Williams College, the Clark Art Institute and the Tony-awarded Williamstown Theatre Festival, which runs every July and August.