Dennis, Massachusetts

Dennis, Massachusetts
Location in Barnstable County and the state of Massachusetts.
Coordinates: 41°44′07″N 70°11′40″W / 41.73528°N 70.19444°W / 41.73528; -70.19444
CountryUnited States
StateMassachusetts
CountyBarnstable
Settled1639
Incorporated1793
Communities
Government
 • TypeOpen town meeting
 • Town
   Administrator
Elizabeth Sullivan
Area
 • Total
22.3 sq mi (57.7 km2)
 • Land20.5 sq mi (53.1 km2)
 • Water1.7 sq mi (4.5 km2)
Elevation
23 ft (7 m)
Population
 (2020)
 • Total
14,674
 • Density716/sq mi (276.3/km2)
Time zoneUTC-5 (Eastern)
 • Summer (DST)UTC-4 (Eastern)
ZIP Codes
02638 (Dennis)
02639 (Dennis Port)
02641 (East Dennis)
02660 (South Dennis)
02670 (West Dennis)
Area code508 / 774
FIPS code25-16775
GNIS feature ID0618252
Websitetown.dennis.ma.us

Dennis is a town on Cape Cod in Massachusetts. It is a seaside resort town with colonial mansions along the northern Cape Cod Bay coastline and beaches along the southern Nantucket Sound. As of the 2020 census, its population was 14,674.

The town encompasses five villages, each with its own post office: Dennis (including North Dennis), Dennis Port, East Dennis, South Dennis, and West Dennis.