Geographic features

Adjacent counties

Major highways

• Interstate 25
• I-25 BL
• U.S. Highway 20
• U.S. Highway 26
• U.S. Highway 87
• U.S. Highway 287
• Wyoming Highway 220
• Wyoming Highway 251
• Wyoming Highway 252
• Wyoming Highway 253
• Wyoming Highway 256
• Wyoming Highway 257
• Wyoming Highway 258
• Wyoming Highway 259
• Wyoming Highway 387
• Wyoming Highway 487

Transit

• Casper Area Transit
• Express Arrow

National protected areas

• Medicine Bow National Forest (part)
• Pathfinder National Wildlife Refuge (part)

2000 census

As of the 2000 United States Census,^[15] of 2000, there were 66,533 persons, 26,819 households, and 17,754 families in the county. The population density was 12 people per square mile (4.6 people/km²). There were 29,882 housing units at an average density of 6 units per square mile (2.3 units/km²). The racial makeup of the county was 94.15% White, 0.76% Black or African American, 1.03% Native American, 0.42% Asian, 0.04% Pacific Islander, 1.92% from other races, and 1.68% from two or more races. 4.90% of the population were Hispanic or Latino of any race. 24.6% were of German, 11.6% English, 11.3% American and 11.2% Irish ancestry.

There were 26,819 households, out of which 32.20% had children under the age of 18 living with them, 51.40% were married couples living together, 10.60% had a female householder with no husband present, and 33.80% were non-families. 27.50% of all households were made up of individuals, and 9.40% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.95.

The county population contained 26.00% under the age of 18, 10.10% from 18 to 24, 27.90% from 25 to 44, 23.30% 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 97.70 males. For every 100 females age 18 and over, there were 95.00 males.

The median income for a household in the county was $36,619, and the median income for a family was $45,575. Males had a median income of $33,524 versus $21,374 for females. The per capita income for the county was $18,913. About 8.70% of families and 11.80% of the population were below the poverty line, including 16.20% of those under age 18 and 7.20% of those age 65 or over.

2010 census

As of the 2010 United States Census, there were 75,450 people, 30,616 households, and 19,714 families in the county.^[16] The population density was 14.1 people per square mile (5.4 people/km²). There were 33,807 housing units at an average density of 6.3 units per square mile (2.4 units/km²).^[17] The racial makeup of the county was 92.8% white, 1.0% American Indian, 0.9% black or African American, 0.7% Asian, 0.1% Pacific islander, 2.2% from other races, and 2.4% from two or more races. Those of Hispanic or Latino origin made up 6.9% of the population.^[16] In terms of ancestry, 27.2% were German, 15.2% were Irish, 13.2% were English, and 10.7% were American.^[18]

Of the 30,616 households, 31.9% had children under the age of 18 living with them, 48.1% were married couples living together, 10.9% had a female householder with no husband present, 35.6% were non-families, and 28.5% of all households were made up of individuals. The average household size was 2.41 and the average family size was 2.94. The median age was 36.8 years.^[16]

The median income for a household in the county was $50,936 and the median income for a family was $62,859. Males had a median income of $47,610 versus $30,664 for females. The per capita income for the county was $28,235. About 5.4% of families and 8.4% of the population were below the poverty line, including 9.9% of those under age 18 and 8.8% of those age 65 or over.^[19]

Cities

• Casper (county seat)

Towns

Census-designated places

Unincorporated communities