Major highways

Adjacent counties

National protected areas

• Gallatin National Forest (part)
• Helena National Forest (part)
• Lewis and Clark National Forest (part)

2020 census

As of the 2020 census, there were 1,927 people living in the county.^{[citation needed]}

2010 census

As of the 2010 census, there were 1,891 people, 806 households, and 509 families in the county. The population density was 0.8 inhabitants per square mile (0.31/km²). There were 1,432 housing units at an average density of 0.6 units per square mile (0.23/km²). The racial makeup of the county was 97.9% white, 0.3% Asian, 0.3% American Indian, 0.1% black or African American, 0.1% from other races, and 1.3% from two or more races. Those of Hispanic or Latino origin made up 1.5% of the population. In terms of ancestry, 38.6% were German, 14.3% were Norwegian, 13.6% were Irish, 11.0% were English, 5.9% were Scotch-Irish, and 3.2% were American.

Of the 806 households, 20.8% had children under the age of 18 living with them, 54.6% were married couples living together, 6.2% had a female householder with no husband present, 36.8% were non-families, and 33.3% of all households were made up of individuals. The average household size was 2.13 and the average family size was 2.67. The median age was 50.1 years.

The median income for a household in the county was $31,577 and the median income for a family was $40,057. Males had a median income of $30,556 versus $16,414 for females. The per capita income for the county was $17,318. About 14.1% of families and 19.0% of the population were below the poverty line, including 21.7% of those under age 18 and 13.0% of those age 65 or over.

City

• White Sulphur Springs (county seat)

Census-designated places

• Martinsdale
• Springdale Colony

Other unincorporated communities

Individual residences (identified on aerial map)

• Ford Place^[19]