2010 census As of the 2010 census, there were 17,398 people, 7,276 households, and 4,509 families residing in the county. The population density was . There were 8,304 housing units at an average density of . The racial makeup of the county was 89.7% white, 3.6% Asian, 1.1% American Indian, 0.8% black or African American, 0.1% Pacific islander, 3.0% from other races, and 1.6% from two or more races. Those of Hispanic or Latino origin made up 7.7% of the population. In terms of ancestry, 45.4% were German, 11.7% were Norwegian, 10.3% were Irish, 8.8% were English, and 4.1% were American.
2010 census As of the 2010 census, there were 17,398 people, 7276 households, and 4,509 families residing in the county. The population density was . There were 8,304 housing units at an average density of . The racial makeup of the county was 89.7% white, 3.6% Asian, 1.1% American .Indian, 0.8% black or African American, 0.1% Pacific islander, 3.0% from other races, and 1.6% from two or more races Those of Hispanic or Latino origin made up 7.7% of the population. In terms of ancestry, 45.4% were German, 11.7% were Norwegian, 10.3% were Irish, 8.8% were English, and 4.1% were American.