Essex County | |
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![]() Former Essex County Courthouse in Salem | |
![]() Location within the U.S. state of Massachusetts | |
![]() Massachusetts's location within the U.S. | |
Coordinates: 42°38′08″N 70°58′15″W / 42.635475°N 70.970825°W | |
Country | ![]() |
State | ![]() |
Founded | 1643 |
Named for | Essex |
Seat | Salem and Lawrence |
Largest city | Lynn |
Area | |
• Total | 828 sq mi (2,140 km2) |
• Land | 493 sq mi (1,280 km2) |
• Water | 336 sq mi (870 km2) 41% |
Population (2020) | |
• Total | 809,829 |
• Density | 1,643/sq mi (634/km2) |
Time zone | UTC−5 (Eastern) |
• Summer (DST) | UTC−4 (EDT) |
Congressional districts | 3rd, 6th |
Essex County is a county in the northeastern part of the state of Massachusetts. As of the 2020 census, the total population was 809,829.[1] It is the third-most populous county in the state. It is part of the Greater Boston area (the Boston–Cambridge–Newton, MA–NH Metropolitan Statistical Area).
The largest city in Essex County is Lynn. The county was named after the English county of Essex. It has two traditional county seats: Salem and Lawrence.