Barnwell is a city in Barnwell County, South Carolina, United States, located along U.S. Route 278. The population was 4,750 at the 2010 census. It is the county seat of Barnwell County.
Barnwell is located east of the center of Barnwell County at 33°14′40″N 81°21′48″W (33.244534, -81.363214). Turkey Creek, a tributary of the Salkehatchie River, runs through the city just west of the downtown, and includes a small impoundment known as Lake Brown in the north part of the city.
As of the census of 2000, there were 5,035 people, 2,035 households, and 1,353 families residing in the city. The population density was 659.5 people per square mile (254.8/km²). There were 2,304 housing units at an average density of 301.8 per square mile (116.6/km²). The racial makeup of the city was 49.81% White, 47.37% Black, 1.05% Asian, 0.40% Native American, 0.04% Pacific Islander, 0.34% from other races, and 0.99% from two or more races. Hispanic or Latino of any race were 0.62% of the population.
There were 2,035 households out of which 34.3% had children under the age of 18 living with them, 40.2% were married couples living together, 22.1% had a female householder with no husband present, and 33.5% were non-families. 30.2% of all households were made up of individuals and 12.5% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 3.01.
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