As of the 2010 United States Census, there were 270,056 people, 105,045 households, and 70,689 families residing in the county. The population density was . There were 116,249 housing units at an average density of . The racial makeup of the county was 64.6% white, 30.5% black or African American, 1.2% Asian, 0.2% American Indian, 0.1% Pacific islander, 1.2% from other races, and 2.2% from two or more races. Those of Hispanic or Latino origin made up 3.3% of the population. In terms of ancestry, 27.5% were German, 11.1% were Irish, 7.4% were English, and 4.6% were American.