Dewey, South Dakota
|Dewey, South Dakota|
|Township||West Custer UT (portion of Custer County west of Custer State Park)|
|Elevation||3,714 ft (1,132 m)|
|Time zone||MST (UTC-7)|
|• Summer (DST)||MDT (UTC-6)|
|GNIS feature ID||1261554|
Dewey is an unincorporated populated place in South Dakota, near the southwest corner of Custer County, less than 1 mile from the Wyoming border, in a prairie region of the Black Hills.  Dewey lies just to the southwest of the Elk Mountains, a small range that is part of the Black Hills.
Dewey was originally called "S and G Ranch" for its owners Sturgis and Goodell. The name was changed in 1890 by either the Burlington Railroad which came through the area that year, or the Post Office Department. The town is a populated place ("a place or area having clustered or scattered buildings and a permanent population") that is not a census designated or incorporated place with an official federally recognized name.
Dewey was a cattle town in the first half of the 20th century. Local ranchers used its rail depot to ship cattle to market.
Two ranches near Dewey are listed on the National Register of Historic Places in Custer County. The Edna and Ernest Young Ranch is approximately three miles south of town, south of Beaver Creek, while the Charles and Ollie Lampert Ranch is north of Dewey.
A desert scene. The mountains in the background are the Elk Mountains and Black Hills National Forest, separated from the Limestone Plateau by highlands and prairie.
A BNSF Railway train near Dewey
- Joann Boggs. Presentation to the Custer County Historical Society around the early 2010s. Recording available from the society for a nominal fee.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- Sneve, Virginia Driving Hawk. South Dakota Geographic Names. Brevet Press, Sioux Falls, SD, 1973. p59
||Newcastle, Wyoming||Black Hills National Forest||Custer, South Dakota|
|Weston County, Wyoming||Black Hills National Forest|
|Niobrara County, Wyoming||Burdock, South Dakota||Edgemont, South Dakota|