As of the 2010 United States Census, there were 81,162 people, 29,860 households, and 20,788 families residing in the county. The population density was . There were 33,098 housing units at an average density of . The racial makeup of the county was 89.6% white, 3.4% Asian, 1.8% black or African American, 0.3% American Indian, 0.1% Pacific islander, 3.2% from other races, and 1.6% from two or more races. Those of Hispanic or Latino origin made up 6.2% of the population. In terms of ancestry, 28.5% were German, 12.4% were English, 12.2% were Irish, and 10.7% were American.