As of the 2010 United States Census, there were 451,225 people, 176,531 households, and 119,362 families residing in the county. The population density was . There were 195,462 housing units at an average density of . The racial makeup of the county was 73.8% white, 18.1% black or African American, 2.0% Asian, 0.3% American Indian, 0.1% Pacific islander, 3.9% from other races, and 1.9% from two or more races. Those of Hispanic or Latino origin made up 8.1% of the population. In terms of ancestry, 13.0% were American, 11.6% were German, 10.9% were English, and 10.7% were Irish.