As of the 2010 United States Census, there were 496,005 people, 188,157 households, and 127,647 families residing in the county. The population density was . There were 208,750 housing units at an average density of . The racial makeup of the county was 64.4% white, 25.9% black or African American, 1.2% Asian, 0.3% American Indian, 5.8% from other races, and 2.4% from two or more races. Those of Hispanic or Latino origin made up 16.7% of the population. In terms of ancestry, 16.1% were German, 11.1% were Irish, 9.6% were Polish, 5.4% were English, and 3.7% were American.