Adjacent counties

National protected areas

• Medicine Bow National Forest (part)
• Thunder Basin National Grassland (part)

Major highways

Transit

• Express Arrow

2000 census

As of the 2000 United States Census,^[9] there were 12,052 people, 4,694 households, and 3,407 families in the county. The population density was 3 people per square mile (1.2 people/km²). There were 5,669 housing units at an average density of 1 units per square mile (0.39 units/km²). The racial makeup of the county was 94.72% White, 0.15% Black or African American, 0.91% Native American, 0.27% Asian, 0.02% Pacific Islander, 2.46% from other races, and 1.47% from two or more races. 5.48% of the population were Hispanic or Latino of any race. 26.6% were of German, 13.5% American, 12.2% English and 11.1% Irish ancestry.

There were 4,694 households, out of which 36.50% had children under the age of 18 living with them, 60.60% were married couples living together, 8.40% had a female householder with no husband present, and 27.40% were non-families. Of 4,694 households, 253 were unmarried partner households: 228 heterosexual, 12 same-sex male, and 13 same-sex female.

23.40% of all households were made up of individuals, and 9.00% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.01.

The county population contained 28.50% under the age of 18, 7.00% from 18 to 24, 28.10% from 25 to 44, 25.40% from 45 to 64, and 11.00% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 99.40 males. For every 100 females age 18 and over, there were 96.40 males.

The median income for a household in the county was $39,603, and the median income for a family was $45,905. Males had a median income of $36,443 versus $19,032 for females. The per capita income for the county was $18,744. About 9.20% of families and 11.60% of the population were below the poverty line, including 15.70% of those under age 18 and 9.70% of those age 65 or over.

2010 census

As of the 2010 United States Census, there were 13,833 people, 5,673 households, and 3,860 families in the county.^[10] The population density was 3.3 people per square mile (1.3 people/km²). There were 6,403 housing units at an average density of 1.5 units per square mile (0.58 units/km²).^[11] The racial makeup of the county was 95.1% white, 0.8% American Indian, 0.3% black or African American, 0.3% Asian, 0.1% Pacific islander, 1.7% from other races, and 1.7% from two or more races. Those of Hispanic or Latino origin made up 6.3% of the population.^[10] In terms of ancestry, 36.8% were German, 19.8% were Irish, 18.0% were English, and 6.2% were American.^[12]

Of the 5,673 households, 32.3% had children under the age of 18 living with them, 55.3% were married couples living together, 8.2% had a female householder with no husband present, 32.0% were non-families, and 26.5% of all households were made up of individuals. The average household size was 2.42 and the average family size was 2.93. The median age was 39.0 years.^[10]

The median income for a household in the county was $54,599 and the median income for a family was $69,057. Males had a median income of $54,863 versus $32,025 for females. The per capita income for the county was $27,656. About 4.5% of families and 7.7% of the population were below the poverty line, including 7.8% of those under age 18 and 7.4% of those age 65 or over.^[13]

City

• Douglas (county seat)

Towns

• Glenrock
• Rolling Hills
• Lost Springs

Census-designated places

• Esterbrook
• Orin

Other unincorporated communities