As of the 2010 United States Census, there were 41,889 people, 16,133 households, and 11,459 families residing in the county. The population density was . There were 17,384 housing units at an average density of . The racial makeup of the county was 95.1% white, 0.5% Asian, 0.3% black or African American, 0.2% American Indian, 3.1% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 6.0% of the population. In terms of ancestry, 58.0% were German, 9.0% were American, 8.1% were Irish, and 6.7% were English.