As of the 2010 United States Census, there were 18,607 people, 6,003 households, and 4,703 families in the county. The population density was 5.74/sqmi (2.22/km2). There were 6,988 housing units at an average density of 2.16/sqmi (0.83/km2). The racial makeup of the county was 89.15% White, 0.24% Black or African American, 4.53% Native American, 0.28% Asian, 0.27% Pacific Islander, 2.64% from other races, and 2.89% from two or more races. 6.00% of the population were Hispanic or Latino of any race.