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Dewey County, South Dakota facts for kids

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Dewey County
Forest City Bridge
Map of South Dakota highlighting Dewey County
Location within the U.S. state of South Dakota
Map of the United States highlighting South Dakota
South Dakota's location within the U.S.
Country  United States
State  South Dakota
Founded 1883 (created)
1910 (organized)
Named for William P. Dewey
Seat Timber Lake
Largest community North Eagle Butte
 • Total 2,445 sq mi (6,330 km2)
 • Land 2,302 sq mi (5,960 km2)
 • Water 143 sq mi (370 km2)  5.8%
 • Total 5,239
 • Estimate 
5,246 Increase
 • Density 2.1427/sq mi (0.82732/km2)
Time zone UTC−7 (Mountain)
 • Summer (DST) UTC−6 (MDT)
Congressional district At-large

Dewey County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 5,239. Its county seat is Timber Lake. The county was created in 1883 and organized in 1910. It was named for William P. Dewey, Territorial surveyor-general from 1873 to 1877.

Almost the entire county lies in the Cheyenne River Indian Reservation. The balance of the county, along its extreme northern county line, lies in the Standing Rock Indian Reservation. It is one of five South Dakota counties that are contained within Indian reservations.


According to the U.S. Census Bureau, the county has a total area of 2,445 square miles (6,330 km2), of which 2,302 square miles (5,960 km2) is land and 143 square miles (370 km2) (5.8%) is water.

Major highways

  • US 212.svg U.S. Highway 212
  • SD 20.svg South Dakota Highway 20
  • SD 63.svg South Dakota Highway 63
  • SD 65.svg South Dakota Highway 65

Adjacent counties


Historical population
Census Pop.
1910 1,145
1920 4,802 319.4%
1930 6,476 34.9%
1940 5,709 −11.8%
1950 4,916 −13.9%
1960 5,257 6.9%
1970 5,170 −1.7%
1980 5,366 3.8%
1990 5,523 2.9%
2000 5,972 8.1%
2010 5,301 −11.2%
2020 5,239 −1.2%
2021 (est.) 5,246 −1.0%
US Decennial Census
1790-1960 1900-1990
1990-2000 2010-2020

2010 census

As of the 2010 United States Census, there were 5,301 people, 1,730 households, and 1,239 families in the county. The population density was 2.3 inhabitants per square mile (0.89/km2). There were 2,002 housing units at an average density of 0.9 per square mile (0.35/km2). The racial makeup of the county was 74.9% American Indian, 21.0% white, 0.2% Asian, 0.1% black or African American, 0.2% from other races, and 3.6% from two or more races. Those of Hispanic or Latino origin made up 1.8% of the population. In terms of ancestry, 13.2% were German, 6.5% were Irish, and 0.6% were American.

Of the 1,730 households, 45.9% had children under the age of 18 living with them, 37.6% were married couples living together, 24.2% had a female householder with no husband present, 28.4% were non-families, and 24.6% of all households were made up of individuals. The average household size was 3.05 and the average family size was 3.60. The median age was 30.0 years.

The median income for a household in the county was $33,255 and the median income for a family was $40,500. Males had a median income of $33,942 versus $28,594 for females. The per capita income for the county was $15,632. About 20.5% of families and 30.5% of the population were below the poverty line, including 39.5% of those under age 18 and 13.5% of those age 65 or over.




Census-designated places

Unincorporated communities

Unorganized territories

The county is divided into two areas of unorganized territory: North Dewey and South Dewey.

See also

Kids robot.svg In Spanish: Condado de Dewey (Dakota del Sur) para niños

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