Altonah is an unincorporated community in central Duchesne County, Utah, United States. The community is located on the Uintah and Ouray Indian Reservation along local roads north of State Route 87, north of the city of Duchesne, the county seat of Duchesne County. It is situated at the southern base of the Uinta Mountains and has an elevation of 6,673 f…Altonah is an unincorporated community in central Duchesne County, Utah, United States. The community is located on the Uintah and Ouray Indian Reservation along local roads north of State Route 87, north of the city of Duchesne, the county seat of Duchesne County. It is situated at the southern base of the Uinta Mountains and has an elevation of 6,673 feet. Although Altonah is unincorporated, it has a post office, with the ZIP code of 84002.
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