2020 census
As of the 2020 census, the county had a population of 7,044. Of the residents, 29.5% were under the age of 18 and 15.7% were 65 years of age or older; the median age was 34.5 years. For every 100 females there were 99.5 males, and for every 100 females age 18 and over there were 98.2 males. 0.0% of residents lived in urban areas and 100.0% lived in rural areas. [10] [11] [12]
The racial makeup of the county was 42.0% White, 0.2% Black or African American, 52.8% American Indian and Alaska Native, 0.2% Asian, 0.7% from some other race, and 4.2% from two or more races. Hispanic or Latino residents of any race comprised 2.2% of the population. [12]
There were 2,467 households in the county, of which 38.2% had children under the age of 18 living with them and 29.9% had a female householder with no spouse or partner present. About 27.5% of all households were made up of individuals and 11.6% had someone living alone who was 65 years of age or older. [11]
There were 2,824 housing units, of which 12.6% were vacant. Among occupied housing units, 61.0% were owner-occupied and 39.0% were renter-occupied. The homeowner vacancy rate was 1.5% and the rental vacancy rate was 6.2%. [11]
2010 census
As of the 2010 census, there were 6,491 people, 2,357 households, and 1,604 families living in the county. The population density was 1.5 inhabitants per square mile (0.58 inhabitants/km2). There were 2,843 housing units at an average density of 0.7 units per square mile (0.27 units/km2). The racial makeup of the county was 49.4% American Indian, 48.2% white, 0.1% black or African American, 0.1% Asian, 0.2% from other races, and 2.0% from two or more races. Those of Hispanic or Latino origin made up 1.8% of the population. In terms of ancestry, 23.0% were German, 9.2% were Norwegian, 6.6% were Irish, 5.7% were English, and 2.0% were American.
Of the 2,357 households, 39.2% had children under the age of 18 living with them, 45.6% were married couples living together, 16.0% had a female householder with no husband present, 31.9% were non-families, and 28.7% of all households were made up of individuals. The average household size was 2.66 and the average family size was 3.28. The median age was 35.1 years.
The median income for a household in the county was $37,034 and the median income for a family was $40,890. Males had a median income of $32,320 versus $28,986 for females. The per capita income for the county was $16,813. About 23.6% of families and 29.0% of the population were below the poverty line, including 44.6% of those under age 18 and 10.6% of those age 65 or over.
United States
Montana 
