Keystone is a quaint town in the Black Hills of South Dakota with a population of 240 year-round residents. The elevation is 4,331 ft (1320 M). Our town has a …
Keystone is a city in the Black Hills region of Pennington County, South Dakota, United States. The population was 240 at the 2020 census.
Keystone is now known as the “Playground of the Black Hills,” featuring over 20 attractions, from thrilling zip lines to adventure parks.