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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.
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Note: Reported in 1880 (as Rusk); included with Cheyenne River and Standing Rock Indian Reservations in 1890- 1900; reported in 1910-90. [edit] Research Tips[edit] External links
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