Geography According to the U.S. Census Bureau, the county has a total area of 6,133 km² (2,368 mi²). 6,116 km² (2,362 mi²) of it is land and 17 km² (6 mi²) of it is water. The total area is 0.27% water.
Demographics As of the census of 2000, there are 19,690 people, 7,953 households, and 4,779 families residing in the county. The population density is 3/km² (8/mi²). There are 11,217 housing units at an average density of 2/km² (5/mi²). The racial makeup of the county is 96.90% White, 0.13% African American, 0.49% Native American, 0.39% Asian, 0.09% Pacific Islander, 0.73% from other races, and 1.28% from two or more races. 3.22% of the population are Hispanic or Latino of any race.
There are 7,953 households out of which 31.10% have children under the age of 18 living with them, 50.60% are married couples living together, 5.80% have a female householder with no husband present, and 39.90% are non-families. 24.40% of all households are made up of individuals and 3.70% have someone living alone who is 65 years of age or older. The average household size is 2.44 and the average family size is 2.92.
In the county the population is spread out with 22.60% under the age of 18, 10.10% from 18 to 24, 36.50% from 25 to 44, 25.70% from 45 to 64, and 5.00% who are 65 years of age or older. The median age is 35 years. For every 100 females there are 116.60 males. For every 100 females age 18 and over, there are 119.40 males.
The median income for a household in the county is $53,612, and the median income for a family is $61,927. Males have a median income of $36,997 versus $26,576 for females. The per capita income for the county is $28,792. 6.10% of the population and 2.80% of families are below the poverty line. Out of the total people living in poverty, 5.20% are under the age of 18 and 7.70% are 65 or older.