Transportation

Adjacent counties and rural municipalities

National protected area

• Charles M. Russell National Wildlife Refuge (part)

2020 census

As of the 2020 census, there were 7,578 people living in the county.^{[citation needed]}

2010 census

As of the 2010 census, there were 7,369 people, 3,198 households, and 1,997 families living in the county. The population density was 1.5 inhabitants per square mile (0.58/km²). There were 4,879 housing units at an average density of 1.0 units per square mile (0.39/km²). The racial makeup of the county was 87.0% white, 9.8% American Indian, 0.5% Asian, 0.2% black or African American, 0.3% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 1.2% of the population. In terms of ancestry, 33.4% were German, 27.9% were Norwegian, 12.4% were Irish, 10.3% were English, and 6.8% were American.

Of the 3,198 households, 26.9% had children under the age of 18 living with them, 50.3% were married couples living together, 8.0% had a female householder with no husband present, 37.6% were non-families, and 33.4% of all households were made up of individuals. The average household size was 2.26 and the average family size was 2.88. The median age was 46.4 years.

The median income for a household in the county was $42,050 and the median income for a family was $54,096. Males had a median income of $40,802 versus $30,272 for females. The per capita income for the county was $24,305. About 5.7% of families and 10.1% of the population were below the poverty line, including 17.0% of those under age 18 and 11.8% of those age 65 or over.

City

• Glasgow (county seat)

Towns

• Fort Peck
• Nashua
• Opheim

Census-designated places

• Frazer
• Hinsdale
• St. Marie

Unincorporated communities

Ghost towns

• Beaverton^[20]
• Genevieve
• Thoeny^[21]

Census Maps