As of the census of 2000, there were 32,603 people, 11,726 households, and 8,876 families living in the county. The population density was 18 people per square mile. There were 12,944 housing units at an average density of 7 per square mile. The racial makeup of the county was 84.65% White, 0.31% Black or African American, 1.09% Native American, 0.55% Asian, 0.10% Pacific Islander, 10.83% from other races, and 2.48% from two or more races. 19.73% of the population were Hispanic or Latino of any race. 18.0% were of German, 10.0% English, 9.3% United States or American and 7.8% Irish ancestry. 81.5% spoke English, and 17.7% Spanish as their first language. There were 11,726 households out of which 38.40% had children under the age of 18 living with them, 61.60% were married couplesliving together, 9.70% had a female householder with no husband present, and 24.30% were non-families. 20.00% of all households were made up of individuals and 7.80% had someone living alone who was 65 years of age or older. The average household size was 2.76 and the average family size was 3.16. In the county, the population was spread out with 29.50% under the age of 18, 8.20% from 18 to 24, 27.30% from 25 to 44, 22.40% from 45 to 64, and 12.70% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 98.20 males. For every 100 females age 18 and over, there were 96.00 males. The median income for a household in the county was $38,464, and the median income for a family was $43,777. Males had a median income of $35,917 versus $24,794 for females. The per capita income for the county was $17,148. About 11.20% of families and 14.40% of the population were below the poverty line, including 21.00% of those under age 18 and 6.90% of those age 65 or over.
2010 census
As of the 2010 United States Census, there were 38,431 people, 13,894 households, and 10,240 families living in the county. The population density was. There were 16,004 housing units at an average density of. The racial makeup of the county was 79.6% white, 1.1% American Indian, 0.7% Asian, 0.3% black or African American, 0.1% Pacific islander, 15.6% from other races, and 2.6% from two or more races. Those of Hispanic or Latino origin made up 28.7% of the population. In terms of ancestry, 20.2% were German, 11.2% were English, 9.4% were Irish, 6.0% were Norwegian, and 5.0% were American. Of the 13,894 households, 37.2% had children under the age of 18 living with them, 57.8% were married couples living together, 10.7% had a female householder with no husband present, 26.3% were non-families, and 20.8% of all households were made up of individuals. The average household size was 2.75 and the average family size was 3.18. The median age was 36.8 years. The median income for a household in the county was $48,708 and the median income for a family was $55,766. Males had a median income of $39,991 versus $31,706 for females. The per capita income for the county was $22,359. About 10.2% of families and 14.3% of the population were below the poverty line, including 22.0% of those under age 18 and 3.7% of those age 65 or over.
