Barnwell County is a county in the U.S. state of South Carolina. As of the 2010 census, its population was 22,621. Its county seat is Barnwell.
According to the U.S. Census Bureau, the county has a total area of 557 square miles (1,440 km²), of which 548 square miles (1,420 km²) is land and 8.9 square miles (23 km²) (1.6%) is water.
As of the 2010 United States Census, there were 22,621 people, 8,937 households, and 6,055 families residing in the county. The population density was 41.2 inhabitants per square mile (15.9/km²). There were 10,484 housing units at an average density of 19.1 per square mile (7.4/km²). The racial makeup of the county was 52.6% white, 44.3% black or African American, 0.6% Asian, 0.4% American Indian, 0.7% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 1.8% of the population. In terms of ancestry, 11.5% were American, 5.7% were German, and 5.4% were English.
Of the 8,937 households, 34.0% had children under the age of 18 living with them, 41.8% were married couples living together, 20.8% had a female householder with no husband present, 32.2% were non-families, and 28.4% of all households were made up of individuals. The average household size was 2.50 and the average family size was 3.05. The median age was 38.8 years.
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