Barnwell is a city in and the county seat of Barnwell County, South Carolina. It has a total area of 7.8 square miles. 0.1 square miles of the area is water, and the rest is land. The city was established in the eighteenth century.
Structures listed on the National Register of Historic Places include the Episcopal Church of the Holy Apostles and its rectory, as well as the Bethlehem Baptist Church and the Old Presbyterian Church. Manufacturing and educational services are the major commercial activities here. Public schooling comprises one elementary, one primary, one middle and one high school. Barnwell Regional Airport is the local airport. Barnwell County Hospital on Reynolds Road is the local hospital. The cost of living here is 12.70% lower than the country average.
This place gets about 46 inches of rain annually. The number of days with measurable precipitation is 108. Snowfall is about an inch annually.