As of the 2010 United States Census, there were 161,419 people, 62,222 households, and 40,757 families living in the county. The population density was . There were 67,472 housing units at an average density of . The racial makeup of the county was 92.3% white, 4.1% black or African American, 1.4% Asian, 0.2% American Indian, 0.3% from other races, and 1.7% from two or more races. Those of Hispanic or Latino origin made up 1.3% of the population. In terms of ancestry, 30.7% were German, 17.1% were Irish, 11.5% were English, 11.0% were Italian, 6.6% were Polish, and 5.7% were American.