Barnwell County
County
Barnwell County Courthouse
Logo
Location within the U.S. state of South Carolina
South Carolina's location within the U.S.
Coordinates: 33°15′38″N 81°26′03″W / 33.260552°N 81.434228°W / 33.260552; -81.434228
Country	United States
State	South Carolina
Founded	1800
Named for	John Barnwell
Seat	Barnwell
Largest community	Barnwell
Area
• Total	557.26 sq mi (1,443.3 km2)
• Land	548.38 sq mi (1,420.3 km2)
• Water	8.88 sq mi (23.0 km2)  1.59%
Population  (2020)
• Total	20,589
• Density	37.55/sq mi (14.50/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	2nd
Website	sc-barnwell.civicplus.com

Barnwell County is a county in the U.S. state of South Carolina. As of the 2020 census, the population was 20,589.^[1] Its county seat is Barnwell.^[2] Barnwell County is part of the Augusta Metropolitan Area.

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