Geography
According to the U.S. Census Bureau, the county has a total area of 3,374 km² (1,303 mi²). 3,372 km² (1,302 mi²) of it is land and 2 km² (1 mi²) of it is water. The total area is 0.06% water.
Demographics
As of the census2 of 2000, there are 40,523 people, 12,948 households, and 9,749 families residing in the county. The population density is 12/km² (31/mi²). There are 13,763 housing units at an average density of 4/km² (11/mi²). The racial makeup of the county is 69.05% White, 1.25% Black or African American, 0.96% Native American, 2.87% Asian, 0.08% Pacific Islander, 22.99% from other races, and 2.80% from two or more races. 43.30% of the population are Hispanic or Latino of any race.
There are 12,948 households out of which 46.00% have children under the age of 18 living with them, 59.80% are married couples living together, 10.50% have a female householder with no husband present, and 24.70% are non-families. 19.60% of all households are made up of individuals and 6.30% have someone living alone who is 65 years of age or older. The average household size is 3.09 and the average family size is 3.55.
In the county the population is spread out with 34.30% under the age of 18, 11.00% from 18 to 24, 31.10% from 25 to 44, 16.60% from 45 to 64, and 7.00% who are 65 years of age or older. The median age is 28 years. For every 100 females there are 104.20 males. For every 100 females age 18 and over, there are 103.30 males.
The median income for a household in the county is $38,474, and the median income for a family is $42,839. Males have a median income of $29,948 versus $21,510 for females. The per capita income for the county is $15,377. 14.20% of the population and 10.00% of families are below the poverty line. Out of the total people living in poverty, 18.60% are under the age of 18 and 10.70% are 65 or older.