Darlington County is a county in the U.S. state of South Carolina. As of 2016, its estimated population was 67,234. Its county seat is Darlington. Hartsville is the largest city in the county. Darlington County is home to the Darlington Raceway, which hosts the annual NASCAR Southern 500. Darlington County is also home to Coker College in Hartsville. Darlington County was named by an act in March 1785. Darlington County is included in the Florence, SC Metropolitan Statistical Area. The county's population was nearly 60% rural in 2000.
According to the U.S. Census Bureau, the county has a total area of 567 square miles (1,470 km²), of which 561 square miles (1,450 km²) is land and 5.7 square miles (15 km²) (1.0%) is water.
As of the 2010 United States Census, there were 68,681 people, 26,531 households, and 18,552 families residing in the county. The population density was 122.4 inhabitants per square mile (47.3/km²). There were 30,297 housing units at an average density of 54.0 per square mile (20.8/km²). The racial makeup of the county was 55.9% white, 41.6% black or African American, 0.3% Asian, 0.3% American Indian, 0.9% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 1.7% of the population. In terms of ancestry, 9.5% were American, 7.0% were English, and 5.3% were Irish.
Of the 26,531 households, 34.1% had children under the age of 18 living with them, 44.0% were married couples living together, 20.5% had a female householder with no husband present, 30.1% were non-families, and 26.0% of all households were made up of individuals. The average household size was 2.54 and the average family size was 3.04. The median age was 39.6 years.
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