As of the 2010 United States Census, there were 78,506 people, 32,746 households, and 22,156 families living in the county. The population density was . There were 40,234 housing units at an average density of . The racial makeup of the county was 86.1% white, 4.4% Asian, 2.2% black or African American, 0.8% American Indian, 0.5% Pacific islander, 1.5% from other races, and 4.5% from two or more races. Those of Hispanic or Latino origin made up 5.5% of the population. The largest ancestry groups were: