Routt County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 23,509. The county seat is Steamboat Springs.
According to the U.S. Census Bureau, the county has a total area of 2,368 square miles (6,130 km), of which 2,362 square miles (6,120 km) is land and 6.1 square miles (16 km) (0.3%) is water.
As of the census of 2000, there were 19,690 people, 7,953 households, and 4,779 families residing in the county. The population density was 8 people per square mile (3/km²). There were 11,217 housing units at an average density of 5 per square mile (2/km²). The racial makeup of the county was 96.90% White, 0.13% Black or 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 were Hispanic Latino of any race.
There were 7,953 households out of which 31.10% had children under the age of 18 living with them, 50.60% were married couples living together, 5.80% had a female householder with no husband present, and 39.90% were non-families. 24.40% of all households were made up of individuals and 3.70% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.92.
In the county, the population was 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 were 65 years of age or older. The median age was 35 years. For every 100 females there were 116.60 males. For every 100 females age 18 and over, there were 119.40 males.
The median income for a household in the county was $53,612, and the median income for a family was $61,927. Males had a median income of $36,997 versus $26,576 for females. The per capita income for the county was $28,792. About 2.80% of families and 6.10% of the population were below the poverty line, including 5.20% of those under age 18 and 7.70% of those age 65 or over.
Routt County Colorado neighborhoods include: Elk River Estate, Elk River Mountain Ranch, Fairview, Steamboat, Heritage Pk, SSII & Spur, Lower elk river, Marabou Ranch, Riverside, Sleepy Bear/West Acres, Steamboat Springs, Timbers Village, Whitewood