As of the 2010 United States Census, there were 21,679 people, 8,214 households, and 6,032 families living in the county. The population density was . There were 9,251 housing units at an average density of . The racial makeup of the county was 70.3% white, 27.6% black or African American, 0.3% Asian, 0.3% American Indian, 0.5% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 1.5% of the population. In terms of ancestry, 16.3% were American, 11.5% were Irish, 7.3% were German, and 6.9% were English.