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Dewey County is a county located in the state of South Dakota. Based on the 2010 census, the population was 5,301. 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 is named for William P. Dewey, the surveyor general of Dakota Territory from 1873 until 1877.
County QuickFacts: CensusBureau Quick Facts
Dewey County was created in 1883 and organized in 1910. The county was named for William P. Dewey, Territorial surveyor-general from 1873 to 1877. In September 1910 a petition was presented to Governor Vessey asking for the organization of the county along the lines and boundaries of the then unorganized county. A special election was held in November to organize the county and elect officers. Timber Lake was named the county seat.
As reported by the Census Bureau, the county has a total area of 2,446 square miles (6,334 km2), of which,
2,303 square miles (5,964 km2) of it is land and 143 square miles (370 km2) of it (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.
Bordering counties are as follows: