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Suffolk County, Massachusetts

county in Massachusetts, United States

Suffolk County is a county in the U.S. state of Massachusetts. 767,254 people lived there in 2014. Its county seat is Boston, the state capital and largest city.

Suffolk County
County of Suffolk
Suffolk County Courthouse
Suffolk County Courthouse
Official seal of Suffolk County
Seal
Map of Massachusetts highlighting Suffolk County
Location within the U.S. state of Massachusetts
Map of the United States highlighting Massachusetts
Massachusetts's location within the U.S.
Coordinates: 42°20′06″N 71°04′25″W / 42.334949°N 71.073494°W / 42.334949; -71.073494
Country United States
State Massachusetts
FoundedMay 10th, 1643
Named forSuffolk
SeatBoston
Largest cityBoston
Area
 • Total120 sq mi (300 km2)
 • Land58 sq mi (150 km2)
 • Water62 sq mi (160 km2)  52%%
Population
 • Estimate 
(2017)
797,939
 • Density13,758/sq mi (5,312/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional districts5th, 7th, 8th