Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 337 at the 2010 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 Mount Rushmore National Memorial, which is located just beyond city limits.
Discover the best top things to do in The Black Hills, United States including Midckelson Trail Adventures, Black Hills Wilderness Edge, Adventure Rentals, M & L ATV Rentals, EagleRider, South Dakota Outdoor Shop, Rabbit Bike Rentals, Black Hills Off-Road Rentals, Black Hills ATV Adventures, Sheridan Lake Marina.
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