Map of Keystone town, South Dakota

Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 240 at the 2020 census. It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving the needs of the millions of visitors to the Mount Rushmore National Memorial, which is located just beyond the town limits. Keystone was heavily damaged in the 1972 Black Hills flood.

The town took its name from a local mine, which most likely was named after the keystone Masonic symbol.

Keystone town overview:
Name:	Keystone town
LSAD Code:	43
LSAD Description:	town (suffix)
State:	South Dakota
County:	Pennington County
Elevation:	4,331 ft (1,320 m)
Total Area:	3.00 sq mi (7.77 km²)
Land Area:	3.00 sq mi (7.77 km²)
Water Area:	0.00 sq mi (0.00 km²)
Total Population:	240
Population Density:	80.00/sq mi (30.89/km²)
ZIP code:	57751
Area code:	605
FIPS code:	4633820
GNISfeature ID:	1261912

Online Interactive Map

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Keystone online map. Source: Basemap layers from Google Map, Open Street Map (OSM), Arcgisonline, Wmflabs. Boundary Data from Database of Global Administrative Areas.