High Quality Content by WIKIPEDIA articles! As of the census of 2000, there were 18,251 people, 7,688 households, and 4,174 families residing in the county. The population density was 5 people per square mile (2/km²). There were 10,267 housing units at an average density of 3 per square mile (1/km²). The racial makeup of the county was 93.59% White, 0.15% Black or African American, 0.53% Native American, 0.54% Asian, 0.03% Pacific Islander, 3.93% from other races, and 1.22% from two or more races. 6.49% of the population were Hispanic or Latino of any race. 19.2% were of German, 14.2% English, 11.7% Irish and 6.7% American ancestry according to Census 2000. As of the census of 2000, there were 18,251 people, 7,688 households, and 4,174 families residing in the county.