Ralph, SD

ZIP code 57650 covers the small town of Mobridge, South Dakota. This area is best known for its proximity to Lake Oahe, a massive reservoir on the Missouri River that offers excellent fishing and water recreation opportunities. Other landmarks in the area include the Sitting Bull Monument, which honors the legendary Hunkpapa Lakota leader, and the 4-mile-long American Creek Campground, popular for outdoor enthusiasts.