Major highways

• South Dakota Highway 34
• South Dakota Highway 37
• South Dakota Highway 224

Adjacent counties

Protected areas^[4]

• McCoy Lake State Public Shooting Area

Lakes and reservoirs^[4]

• Long Lake
• Twin Lakes (partial)

2020 census

As of the 2020 census, there were 2,330 people, 936 households, and 630 families residing in the county.^[12] The population density was 4.1 inhabitants per square mile (1.6/km²). There were 1,134 housing units.

2010 census

As of the 2010 census, there were 2,355 people, 975 households, and 630 families in the county. The population density was 4.1 inhabitants per square mile (1.6/km²). There were 1,172 housing units at an average density of 2.1 units per square mile (0.81 units/km²). The racial makeup of the county was 98.0% white, 0.3% American Indian, 0.2% Asian, 0.6% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 1.2% of the population. In terms of ancestry.

Of the 975 households, 24.2% had children under the age of 18 living with them, 55.0% were married couples living together, 6.3% had a female householder with no husband present, 35.4% were non-families, and 31.1% of all households were made up of individuals. The average household size was 2.24 and the average family size was 2.79. The median age was 47.1 years.

The median income for a household in the county was $44,732 and the median income for a family was $56,304. Males had a median income of $32,361 versus $23,724 for females. The per capita income for the county was $21,055. About 7.7% of families and 12.7% of the population were below the poverty line, including 21.4% of those under age 18 and 15.1% of those age 65 or over.

City

• Woonsocket (county seat)

Towns

• Artesian
• Letcher

Census-designated place

• Forestburg
• Upland Colony

Unincorporated community

• Cuthbert

Townships