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Dewey County

South Dakota

History and Genealogy

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Online Data


* County Seat

Unorganized Territory:

North Dewey

South Dewey

Dewey County Map
County Seat: Timber Lake
Year Organized: 1873
Square Miles: 2,303

A Little About Dewey County
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.

Courthouse info:
PO Box 277
County Courthouse
Timber Lake, SD 57656-0277
Phone: (605) 865-3672


Corson County * Potter County * Stanley County * Sully County * Walworth County * Ziebach County

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