|Barnwell County South Carolina Cities/Towns - Barnwell (County Seat), Blackville, Elko, Hilda, Kline, Snelling, Williston
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Barnwell County is a county located in the U.S. state of South Carolina. In 2016 the U.S. Census Bureau estimated that its population was 21,483. Its county seat is Barnwell.
History The Barnwell District was created in 1798 (effective in 1800) from the southwestern portion of the Orangeburg District, along the Savannah River. It was named after John Barnwell, a local figure in the Revolutionary War.