Dukes County, Massachusetts

Dukes County is a county in the U.S. state of Massachusetts. As of the 2020 census, the population was 20,600.^[1] The county seat is Edgartown.^[2]

Dukes County
County
Town Hall, Edgartown
Seal
Location within the U.S. state of Massachusetts
Massachusetts's location within the U.S.
Coordinates: 41°24′53″N 70°36′46″W
Country	United States
State	Massachusetts
Founded	1695
Named for	James, Duke of York
Seat	Edgartown
Largest town	Oak Bluffs
Area
• Total	491 sq mi (1,270 km2)
• Land	103 sq mi (270 km2)
• Water	388 sq mi (1,000 km2)  79%
Population  (2020)
• Total	20,600
• Density	199.6/sq mi (77.1/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	9th
Website	www.dukescounty.org