sentences:  There were 18,016 housing units at an average density of 3 per square mile (1/km²).The racial makeup of the county was 56.62% White, 0.35% Black or African American, 13.88% Native American, 0.14% Asian, 0.11% Pacific Islander, 25.62% from other races, and 3.28% from two or more races.72.89% of the population were Hispanic or Latino of any race.