As of the 2000 United States Census, there were 18,991 people, 7,780 households, and 4,839 families in the county. The population density was 7 people per square mile (3/km2). There were 12,186 housing units at an average density of 5 per square mile (2/km2). The racial makeup of the county was 90.73% White, 0.13% Black or African American, 0.33% Native American, 0.73% Asian, 0.07% Pacific Islander, 6.43% from other races, and 1.57% from two or more races. 10.69% of the population were Hispanic or Latino of any race. 17.0% were of English, 14.6% German, 10.8% Irish and 6.2% American ancestry.