As of the 2010 United States Census, there were 69,367 people, 23,971 households, and 18,214 families living in the county. The population density was . There were 26,400 housing units at an average density of . The racial makeup of the county was 78.8% white, 11.4% black or African American, 3.4% Asian, 0.3% American Indian, 0.1% Pacific islander, 3.7% from other races, and 2.3% from two or more races. Those of Hispanic or Latino origin made up 8.7% of the population. In terms of ancestry, 20.6% were American, 10.7% were Irish, 9.1% were German, and 8.5% were English.