As of the 2010 United States Census, there were 15,464 people, 5,531 households, and 3,927 families living in the county. The population density was . There were 6,093 housing units at an average density of . The racial makeup of the county was 80.7% white, 0.8% American Indian, 0.5% Asian, 0.2% black or African American, 0.1% Pacific islander, 15.3% from other races, and 2.4% from two or more races. Those of Hispanic or Latino origin made up 28.1% of the population. In terms of ancestry, 14.2% were German, 11.3% were Irish, 11.0% were English, and 5.6% were American.