Essex County
County
Former Essex County Courthouse in Salem
Seal
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 / 42.635475; -70.970825
Country	United States
State	Massachusetts
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.

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