Middlesex County: 017: Lowell, Cambridge: 1643: One of four original counties created in the Massachusetts Bay Colony. Government abolished in 1997. For the English county of Middlesex: 1,614,742: 824 sq mi (2,134 km 2) Nantucket County: 019: Nantucket: 1695: From Nantucket Island which had been part of Dukes County, New York until ...

Berkshire County (pronounced / ˈ b ɜːr k ʃ ər /) is a county on the western edge of the U.S. state of Massachusetts.As of the 2020 census, the population was 129,026. Its largest city and traditional county seat is Pittsfield. The county was founded in 1761. The Berkshire Hills are centered on Berkshire County. Residents are known as Berkshirites. It exists today only as a historical ...