Adjacent counties

Major highways

• Interstate 94
• U.S. Highway 10 (Former)
• Montana Highway 7
• S-261

National protected area

• Lamesteer National Wildlife Refuge

2020 census

As of the 2020 census, there were 937 people living in the county.^{[citation needed]}

2010 census

As of the 2010 census, there were 1,017 people, 457 households, and 281 families in the county. The population density was 1.1 inhabitants per square mile (0.42/km²). There were 538 housing units at an average density of 0.6 units per square mile (0.23/km²). The racial makeup of the county was 97.6% white, 0.5% Asian, 0.4% American Indian, 0.3% from other races, and 1.2% from two or more races. Those of Hispanic or Latino origin made up 1.3% of the population. In terms of ancestry, 46.3% were German, 13.7% were Polish, 13.4% were Irish, 12.1% were American, 9.5% were English, 8.0% were Norwegian, and 5.3% were Dutch.

Of the 457 households, 24.1% had children under the age of 18 living with them, 50.1% were married couples living together, 6.1% had a female householder with no husband present, 38.5% were non-families, and 35.4% of all households were made up of individuals. The average household size was 2.17 and the average family size was 2.80. The median age was 49.0 years.

The median income for a household in the county was $40,417 and the median income for a family was $51,354. Males had a median income of $43,438 versus $24,821 for females. The per capita income for the county was $22,579. About 7.2% of families and 11.8% of the population were below the poverty line, including 22.7% of those under age 18 and 12.8% of those age 65 or over.

Town

• Wibaux (county seat)

Unincorporated communities

• Carlyle
• St. Phillip^[12]
• Yates