Keystone, SD

ZIP code 57751 belongs to the town of Lead, South Dakota. Located in the Black Hills, this area is known for its historic Homestake Mine, which once held the title of the largest and deepest gold mine in North America. The famous Sanford Lab Homestake Visitor Center offers insight into the mining history of the region, while the scenic Mickelson Trail provides opportunities for outdoor recreation such as hiking and biking.