As of the 2010 United States Census, there were 894,014 people, 350,854 households, and 227,831 families living in the county. The population density was . There were 374,249 housing units at an average density of . The racial makeup of the county was 72.4% white, 13.3% black, 4.2% Asian, 0.3% American Indian, 7.1% from other races, and 2.7% from two or more races. Those of Hispanic origin made up 15.3% of the population. In terms of ancestry, 15.9% were Italian, 15.6% were Irish, 10.7% were Polish, 9.4% were English, 8.8% were German, and 2.5% were American.