2020 census
As of the 2020 census, the county had a population of 11,446. Of the residents, 20.7% were under the age of 18 and 26.3% were 65 years of age or older; the median age was 47.5 years. For every 100 females there were 102.4 males, and for every 100 females age 18 and over there were 99.6 males. 52.6% of residents lived in urban areas and 47.4% lived in rural areas. [11] [12]
The racial makeup of the county was 93.2% White, 0.2% Black or African American, 1.2% American Indian and Alaska Native, 0.3% Asian, 0.5% from some other race, and 4.6% from two or more races. Hispanic or Latino residents of any race comprised 2.0% of the population. [13]
There were 5,032 households in the county, of which 23.8% had children under the age of 18 living with them and 23.9% had a female householder with no spouse or partner present. About 34.8% of all households were made up of individuals and 17.9% had someone living alone who was 65 years of age or older. [11]
There were 6,013 housing units, of which 16.3% were vacant. Among occupied housing units, 72.2% were owner-occupied and 27.8% were renter-occupied. The homeowner vacancy rate was 2.7% and the rental vacancy rate was 10.2%. [11]
2010 census
As of the 2010 census, there were 11,586 people, 5,099 households, and 3,202 families living in the county. The population density was 2.7 inhabitants per square mile (1.0/km2). There were 5,836 housing units at an average density of 1.3 per square mile (0.50/km2). The racial makeup of the county was 96.6% white, 1.2% American Indian, 0.2% black or African American, 0.2% Asian, 0.2% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 1.5% of the population. In terms of ancestry, 30.8% were German, 15.9% were English, 14.7% were Norwegian, 12.8% were Irish, and 4.2% were American.
Of the 5,099 households, 23.8% had children under the age of 18 living with them, 52.9% were married couples living together, 6.5% had a female householder with no husband present, 37.2% were non-families, and 32.6% of all households were made up of individuals. The average household size was 2.18 and the average family size was 2.75. The median age was 47.8 years.
The median income for a household in the county was $37,607 and the median income for a family was $48,623. Males had a median income of $35,110 versus $21,225 for females. The per capita income for the county was $22,295. About 12.5% of families and 14.7% of the population were below the poverty line, including 24.2% of those under age 18 and 9.3% of those age 65 or over.
United States
Montana 
