2020 census
As of the 2020 census, the county had a population of 4,535. [10] Of the residents, 18.0% were under the age of 18 and 28.6% were 65 years of age or older; the median age was 52.8 years. For every 100 females there were 105.6 males, and for every 100 females age 18 and over there were 106.0 males. [11] 0.0% of residents lived in urban areas and 100.0% lived in rural areas. [12]
The racial makeup of the county was 90.3% White, 0.2% Black or African American, 1.5% American Indian and Alaska Native, 0.5% Asian, 0.9% from some other race, and 6.4% from two or more races. Hispanic or Latino residents of any race comprised 3.2% of the population. [10]
There were 2,040 households in the county, of which 20.1% had children under the age of 18 living with them and 20.7% had a female householder with no spouse or partner present. About 31.3% of all households were made up of individuals and 15.9% had someone living alone who was 65 years of age or older. [11]
There were 2,563 housing units, of which 20.4% were vacant. Among occupied housing units, 75.5% were owner-occupied and 24.5% were renter-occupied. The homeowner vacancy rate was 1.6% and the rental vacancy rate was 7.1%. [11]
2010 census
As of the 2010 census, there were 4,223 people, 1,911 households, and 1,229 families in the county. The population density was 3.5 inhabitants per square mile (1.4 inhabitants/km2). There were 2,446 housing units at an average density of 2.0 units per square mile (0.77 units/km2). The racial makeup of the county was 94.9% white, 1.5% American Indian, 0.7% Asian, 0.3% black or African American, 0.2% from other races, and 2.4% from two or more races. Those of Hispanic or Latino origin made up 1.9% of the population. In terms of ancestry, 30.9% were German, 16.9% were Irish, 15.4% were English, and 3.0% were American.
Of the 1,911 households, 21.9% had children under the age of 18 living with them, 52.4% were married couples living together, 7.3% had a female householder with no husband present, 35.7% were non-families, and 29.7% of all households were made up of individuals. The average household size was 2.20 and the average family size was 2.69. The median age was 49.8 years.
The median income for a household in the county was $37,256 and the median income for a family was $44,271. Males had a median income of $35,536 versus $20,370 for females. The per capita income for the county was $19,209. About 12.7% of families and 19.0% of the population were below the poverty line, including 36.0% of those under age 18 and 4.3% of those age 65 or over.
United States
Montana 
