Suffolk County | |
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![]() Suffolk County Courthouse | |
![]() Location within the U.S. state of Massachusetts | |
![]() Massachusetts's location within the U.S. | |
Coordinates: 42°20′06″N 71°04′25″W / 42.334949°N 71.073494°W | |
Country | ![]() |
State | ![]() |
Founded | May 10, 1643 |
Named for | Suffolk |
Seat | Boston |
Largest city | Boston |
Area | |
• Total | 120 sq mi (300 km2) |
• Land | 58.15 sq mi (150.6 km2) |
• Water | 62 sq mi (160 km2) 52% |
Population (2020) | |
• Total | 797,936 ![]() |
• Density | 13,698/sq mi (5,289/km2) |
Time zone | UTC−5 (Eastern) |
• Summer (DST) | UTC−4 (EDT) |
Congressional districts | 5th, 7th, 8th |
Suffolk County (/ˈsʌfək/, SUF-ək) is located in the Commonwealth of Massachusetts, in the United States. As of the 2020 census, the population was 797,936,[1] making it the fourth-most populous county in Massachusetts.[2] The county comprises the cities of Boston, Chelsea, and Revere, and the town of Winthrop.[3] The traditional county seat is Boston, the state capital and the largest city in Massachusetts.[4] The county government was abolished in 1999, resulting in Suffolk County now functioning only as an administrative subdivision of state government and a set of communities grouped together for some statistical purposes. Suffolk County is located at the core of the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area as well as the greater Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area.