Keystone, SD

ZIP code 57751 serves Keystone, South Dakota, a small community in the Black Hills near Rapid City. Its best-known landmark is Mount Rushmore National Memorial, just outside the town center. Local attractions include Big Thunder Gold Mine, the National Presidential Wax Museum, Keystone Historical Museum, and Rushmore Tramway Adventures. The town also provides visitor services and access to nearby Black Hills recreation and historic sites.