Chelsea, Massachusetts

City in Massachusetts, United StatesChelsea, MassachusettsCityThe Tobin Bridge, linking Chelsea and Boston FlagSealLocation in Suffolk County and the state of MassachusettsChelseaLocation within Greater Boston areaShow map of Greater Boston areaChelseaLocation within MassachusettsShow map of MassachusettsChelseaLocation within the United StatesShow map of the United StatesCoordinates: 42°23′30″N 71°02′00″W / 42.39167°N 71.03333°W / 42.39167; -71.03333CountryUnited StatesStateMassachusettsCountySuffolkSettled1624Incorporated (town)1739Incorporated (city)1857Government • TypeCouncil–manager • City managerFidel MaltezArea • Total2.47 sq mi (6.39 km2) • Land2.22 sq mi (5.75 km2) • Water0.25 sq mi (0.64 km2)Elevation9.8 ft (3 m)Population (2020) • Total40,787 • Density18,383.4/sq mi (7,097.87/km2)Time zoneUTC−5 (Eastern) • Summer (DST)UTC−4 (Eastern)ZIP Code02150Area code617/857FIPS code25-13205GNIS feature ID0612723Websitewww.chelseama.gov Chelsea is a city in Suffolk County, Massachusetts, United States. It is located along the Mystic River and connected to Boston by the Tobin Bridge. As of 2026, Chelsea has a population of 40,245 and a total