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 is a county in the US state of South Carolina As of the 2020 census its population was 20589 It is located in the Central Savannah River Area Its county seat is Barnwell