Dewey County, South Dakota

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Dewey County is a county located in the U.S. state of South Dakota. As of 2000, the population was 5,972. Its county seat is Timber Lake.[1] It was created in 1883 and was named for William P. Dewey, Territorial surveyor-general from 1873 to 1877.



According to the U.S. Census Bureau, the county has a total area of 2,446 square miles (6,335.1 km2), of which 2,303 square miles (5,964.7 km2) is land and 143 square miles (370.4 km2) (5.85%) is water. 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 lie entirely on Indian reservations.


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

Major highways

Adjacent counties

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