As of the 2010 census, there were 230,041 people, 94,156 households, and 62,384 families residing in the county. The population density was . There were 101,202 housing units at an average density of . The racial makeup of the county was 92.5% white, 3.2% black or African American, 1.1% Asian, 0.1% American Indian, 1.6% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 3.4% of the population. In terms of ancestry, 26.4% were German, 18.9% were Irish, 16.4% were Italian, 11.5% were English, 7.6% were Polish, 5.4% were Hungarian, and 3.9% were American.