Dewey County, South Dakota

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.

Dewey County
Forest City Bridge
Location within the U.S. state of South Dakota
South Dakota's location within the U.S.
Coordinates: 45°10′N 100°53′W
Country United States
State South Dakota
Founded1883 (created)
1910 (organized)
Named forWilliam P. Dewey
SeatTimber Lake
Largest communityNorth Eagle Butte
Area
  Total2,445 sq mi (6,330 km2)
  Land2,302 sq mi (5,960 km2)
  Water143 sq mi (370 km2)  5.8%
Population
 (2020)
  Total5,239
  Estimate 
(2023)
5,208
  Density2.1/sq mi (0.83/km2)
Time zoneUTC−7 (Mountain)
  Summer (DST)UTC−6 (MDT)
Congressional districtAt-large

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.

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