Major highways

Adjacent counties

National protected area

• Helena National Forest (part)

2020 census

As of the 2020 census, there were 6,774 people living in the county.^{[citation needed]}

2010 census

As of the 2010 census, there were 5,612 people, 2,347 households, and 1,614 families living in the county. The population density was 4.7 inhabitants per square mile (1.8/km²). There were 2,695 housing units at an average density of 2.3 units per square mile (0.89 units/km²). The racial makeup of the county was 96.2% white, 1.3% American Indian, 0.3% black or African American, 0.2% Pacific islander, 0.2% Asian, 0.3% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 2.2% of the population. In terms of ancestry, 38.7% were German, 16.2% were English, 15.5% were Irish, 7.9% were Norwegian, 6.4% were Scottish, and 2.3% were American.

Of the 2,347 households, 27.5% had children under the age of 18 living with them, 58.7% were married couples living together, 6.2% had a female householder with no husband present, 31.2% were non-families, and 26.6% of all households were made up of individuals. The average household size was 2.37 and the average family size was 2.85. The median age was 45.4 years.

The median income for a household in the county was $44,667 and the median income for a family was $46,949. Males had a median income of $34,500 versus $32,014 for females. The per capita income for the county was $19,606. About 5.8% of families and 10.1% of the population were below the poverty line, including 10.0% of those under age 18 and 7.1% of those age 65 or over.

City

• Townsend (county seat)

Census-designated places

Unincorporated communities

Former communities

• Lombard