Keystone, South Dakota
Town
Business district in Keystone
Motto:  "Home of Mount Rushmore"
Location in Pennington County and the state of South Dakota
Coordinates: 43°53′42″N 103°25′36″W / 43.89500°N 103.42667°W / 43.89500; -103.42667
Country	United States
State	South Dakota
County	Pennington
Area [1]
• Total	3.00 sq mi (7.77 km2)
• Land	3.00 sq mi (7.77 km2)
• Water	0.00 sq mi (0.00 km2)
Elevation [2]	4,554 ft (1,388 m)
Population  (2020)[3]
• Total	240
• Density	80.00/sq mi (30.89/km2)
Time zone	UTC-7 (Mountain (MST))
• Summer (DST)	UTC-6 (MDT)
ZIP code	57751
Area code	605
FIPS code	46-33820[4]
GNIS feature ID	1267444[2]

Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 240 at the 2020 census.^[3] It is known for being the location of Mount Rushmore National Memorial, which is located just beyond city limits.

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