Keystone, SD is a city located in Pennington County, South Dakota and has a land area of 44.22 square miles (114.53 km2). The water area for the city is 0.01 square miles or 0.03 km2. There is one unique zip code in Keystone, South Dakota and it is 57751. The area code(s) for Keystone is 605.
|
|