Poston, AZ

ZIP code 85371 is located in Supai, Arizona, within the Havasupai Indian Reservation. This remote area is home to the picturesque Havasu Falls, Mooney Falls, and Navajo Falls, attracting hikers and outdoor enthusiasts seeking to explore the stunning Grand Canyon landscapes. Accessible only by foot, horseback, or helicopter, Supai village is the only place in the United States where mail is still delivered by pack mules.