Barnwell County, South Carolina

Barnwell County is a county in the U.S. state of South Carolina. As of the 2020 census, its population was 20,589. It is located in the Central Savannah River Area. Its county seat is Barnwell.

Barnwell County
Barnwell County Courthouse
Location within the U.S. state of South Carolina
South Carolina's location within the U.S.
Coordinates: 33.26°N 81.43°W / 33.26; -81.43
Country United States
State South Carolina
Founded1800
Named forJohn Barnwell
SeatBarnwell
Largest communityBarnwell
Area
  Total557.26 sq mi (1,443.3 km2)
  Land548.38 sq mi (1,420.3 km2)
  Water8.88 sq mi (23.0 km2)  1.59%
Population
 (2020)
  Total20,589
  Estimate 
(2023)
20,447
  Density37.55/sq mi (14.50/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district2nd
Websitewww.barnwellcountysc.us
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