As of the 2010 United States Census, there were 125,488 people, 49,043 households, and 30,923 families living in the county. The population density was . There were 53,376 housing units at an average density of . The racial makeup of the county was 92.8% white, 2.4% black or African American, 1.5% Asian, 0.2% American Indian, 1.3% from other races, and 1.7% from two or more races. Those of Hispanic or Latino origin made up 4.5% of the population. In terms of ancestry, 40.8% were German, 14.4% were Irish, 10.4% were English, 6.7% were Polish, and 5.2% were American.