Keystone, South Dakota
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Keystone, SD
Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 337 at the 2010 census. Wikipedia
County: Pennington County
Population: 342 (2012)
Area: 2.861 sq miles (7.41 km²)
Elevation: 4,331 ft (1,320 m)
Time Zone: Mountain Standard Time
Zip Codes: 57751
Area Codes: 605
