Glenham, SD

ZIP code 57631 encompasses the small town of Dupree, South Dakota. This rural community is home to important landmarks such as the Cheyenne River Indian Reservation and the Standing Rock Indian Reservation. The area is rich in Native American history and culture, with the residents predominantly belonging to the Cheyenne River Sioux Tribe. The zip code's landscape features vast prairies and the meandering Cheyenne River, adding to its scenic beauty.