2020 census
As of the 2020 census, the county had a population of 762. Of the residents, 23.8% were under the age of 18 and 27.3% were 65 years of age or older; the median age was 45.0 years. For every 100 females there were 106.5 males, and for every 100 females age 18 and over there were 112.0 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 91.6% White, 0.1% Black or African American, 2.6% American Indian and Alaska Native, 0.5% Asian, 0.7% from some other race, and 4.3% from two or more races. Hispanic or Latino residents of any race comprised 4.1% of the population. [12]
There were 349 households in the county, of which 29.5% had children under the age of 18 living with them and 15.5% had a female householder with no spouse or partner present. About 29.5% of all households were made up of individuals and 14.9% had someone living alone who was 65 years of age or older. [11]
There were 448 housing units, of which 22.1% were vacant. Among occupied housing units, 70.5% were owner-occupied and 29.5% were renter-occupied. The homeowner vacancy rate was 1.6% and the rental vacancy rate was 7.0%. [11]
2010 census
As of the 2010 census, there were 718 people, 335 households, and 219 families residing in the county. The population density was 0.7 inhabitants per square mile (0.27/km2). There were 422 housing units at an average density of 0.4 per square mile (0.15/km2). The racial makeup of the county was 93.9% white, 0.8% American Indian, 0.4% Asian, 1.9% from other races, and 2.9% from two or more races. Those of Hispanic or Latino origin made up 3.5% of the population. In terms of ancestry, 40.2% were American, 22.4% were German, 9.9% were English, 9.9% were Irish, and 7.4% were Norwegian.
Of the 335 households, 22.4% had children under the age of 18 living with them, 58.5% were married couples living together, 2.1% had a female householder with no husband present, 34.6% were non-families, and 32.5% of all households were made up of individuals. The average household size was 2.14 and the average family size was 2.67. The median age was 51.5 years.
The median income for a household in the county was $37,969 and the median income for a family was $51,458. Males had a median income of $38,194 versus $26,563 for females. The per capita income for the county was $20,882. About 4.6% of families and 8.2% of the population were below the poverty line, including 15.2% of those under age 18 and 5.6% of those age 65 or over.
United States
Montana 
