ZIP Code 57751
About Keystone
Keystone is a city 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.
From Wikipedia — text licensed CC BY-SA 4.0.
Area Profile
US Census (ACS 5-year · Gazetteer)
996
population
$100,714
median household income
23
people / sq mi
$388,300
median home value
$660
median gross rent
52.2
median age
450
housing units
366
households
44.2
land area (sq mi)
Key places in 57751
- Mount Rushmore National Memorial attraction
- Rushmore Cave attraction
Points of interest
- coffee