Adjacent counties

Major highways

• U.S. Highway 20
• U.S. Highway 26
• U.S. Highway 287
• Wyoming Highway 28
• Wyoming Highway 131
• Wyoming Highway 132
• Wyoming Highway 133
• Wyoming Highway 134
• Wyoming Highway 135
• Wyoming Highway 136
• Wyoming Highway 138
• Wyoming Highway 789

Transit

• Express Arrow
• Wind River Transportation Authority

National protected areas

• Bridger National Forest (part)
• Shoshone National Forest (part)
• Teton National Forest (part)

The Bridger National Forest and the Teton National Forest have been administratively combined into the Bridger–Teton National Forest. Fremont County contains portions of both originally-designated forests.

2000 census

As of the 2000 United States census,^[10] there were 35,804 people, 13,545 households, and 9,481 families in Fremont County. The population density was 4 people per square mile (1.5 people/km²). There were 15,541 housing units at an average density of 2 units per square mile (0.77 units/km²). The racial makeup was 76.49% White, 0.12% Black or African American, 19.68% Native American, 0.30% Asian, 0.03% Pacific Islander, 1.16% from other races, and 2.21% from two or more races. 4.37% of the population were Hispanic or Latino of any race. 22.1% were of German, 9.9% English, 8.2% Irish and 6.3% American ancestry.

There were 13,545 households, out of which 32.20% had children under the age of 18 living with them, 54.30% were married couples living together, 10.90% had a female householder with no husband present, and 30.00% were non-families. 25.50% of all households were made up of individuals, and 10.00% had someone living alone who was 65 years of age or older. The average household size was 2.58 and the average family size was 3.10.

The county population contained 27.40% under the age of 18, 8.30% from 18 to 24, 25.90% from 25 to 44, 25.00% from 45 to 64, and 13.30% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 98.20 males. For every 100 females age 18 and over, there were 95.40 males.

The median income for a household in the county was $32,503, and the median income for a family was $37,983. Males had a median income of $30,620 versus $19,802 for females. The per capita income for the county was $16,519. About 13.30% of families and 17.60% of the population were below the poverty line, including 23.70% of those under age 18 and 12.50% of those age 65 or over.

2010 census

As of the 2010 United States census, there were 40,123 people, 15,455 households, and 10,360 families residing in the county.^[11] The population density was 4.4 people per square mile (1.7 people/km²). There were 17,796 housing units at an average density of 1.9 units per square mile (0.73 units/km²).^[12] The racial makeup of the county was 74.3% white, 21.2% American Indian, 0.4% Asian, 0.3% black or African American, 1.0% from other races, and 2.8% from two or more races. Those of Hispanic or Latino origin made up 5.6% of the population.^[11] In terms of ancestry, 21.7% were German, 13.5% were English, 12.2% were Irish, and 7.7% were American.^[13]

Of the 15,455 households, 32.3% had children under the age of 18 living with them, 49.3% were married couples living together, 12.2% had a female householder with no husband present, 33.0% were non-families, and 27.0% of all households were made up of individuals. The average household size was 2.54 and the average family size was 3.07. The median age was 38.5 years.^[11]

The median income for a household in the county was $46,397 and the median income for a family was $55,531. Males had a median income of $44,087 versus $27,751 for females. The per capita income for the county was $24,173. About 10.3% of families and 14.0% of the population were below the poverty line, including 20.7% of those under age 18 and 6.4% of those age 65 or over.^[14]

Cities

• Lander (county seat)
• Riverton

Towns

Census-designated places

Unincorporated communities

Former communities

• Miner's Delight (Hamilton City)