At the 2010 census, 4,010 people, 1,742 households, and 1,141 families were living in the county. The population density was . The 1,990 housing units averaged . The racial makeup of the county was 92.1% White, 1.6% Asian, 1.6% American Indian, 1.0% Black or African American, 0.4% Pacific Islander, 1.1% from other races, and 2.2% from two or more races. Those of Hispanic or Latino origin made up 5.7% of the population. In terms of ancestry, 20.9% were German, 20.1% were Irish, 11.5% were English, 7.2% were Italian, and 2.6% were American.