As of the census of 2010, there were 16,644 people, 6,677 households, and 4,613 families residing in the county. The population density was 12/km2 (30/sq mi). There were 8,480 housing units at an average density of 6/km2 (15/sq mi). The racial makeup of the county was 96.61% White, 1.78% Black or African American, 0.23% Native American, 0.38% Asian, 0.01% Pacific Islander, 0.17% from other races, and 0.68% from two or more races. 0.9% of the population were Hispanic or Latino of any race. 33.6% were of German, 16.0% Norwegian, 11.4% Irish, 7.2% Czech, 7.2% English and 6.4% United States or American ancestry.