Rapid City Medical Federal Credit Union Address: 625 Flormann St, Rapid City, SD 57701 Phone: (605) 342-7776 Banks, Credit Unions Other Businesses: The City of Presidents Walking Tour & Information Center at 632 Main St, Rapid City, SD 57701 Black Hills Federal Credit Union at 2700 N Plaza Dr, Rapid City, SD 57702 Security First Bank at 1540 Samco Rd, Rapid City, SD 57702 Great Western Bank at 3510 Sturgis Rd, Rapid City, SD 57702