Major highways

Adjacent counties

Protected areas

• Mazeppa State Public Shooting Area^[8]
• Mud Lake State Public Shooting Area^[9]

Lakes

Source:^[5]

2020 census

As of the 2020 census, there were 7,556 people, 3,103 households, and 2,014 families residing in the county.^[15] The population density was 11.1 inhabitants per square mile (4.3/km²). There were 3,426 housing units.

2010 census

As of the 2010 census, there were 7,356 people, 3,089 households, and 2,076 families in the county. The population density was 10.8 inhabitants per square mile (4.2/km²). There were 3,526 housing units at an average density of 5.2 units per square mile (2.0 units/km²). The racial makeup of the county was 97.1% white, 0.5% American Indian, 0.3% Asian, 0.1% black or African American, 1.1% from other races, and 0.8% from two or more races. Those of Hispanic or Latino origin made up 2.3% of the population. In terms of ancestry, 49.9% were German, 16.8% were Norwegian, 8.9% were Irish, 6.7% were Swedish, 5.6% were English, and 5.2% were American.

Of the 3,089 households, 28.1% had children under the age of 18 living with them, 57.2% were married couples living together, 6.1% had a female householder with no husband present, 32.8% were non-families, and 29.6% of all households were made up of individuals. The average household size was 2.35 and the average family size was 2.89. The median age was 45.1 years.

The median income for a household in the county was $42,625 and the median income for a family was $56,250. Males had a median income of $36,204 versus $25,567 for females. The per capita income for the county was $22,887. About 7.0% of families and 11.6% of the population were below the poverty line, including 13.8% of those under age 18 and 17.8% of those age 65 or over.

Cities

• Big Stone City
• Milbank (county seat)

Towns

Unincorporated communities

• Troy

Townships