Newcastle (also New Castle) is a census-designated place in southwestern Iron County, Utah, United States. It lies along State Route 56 southwest of the city of Parowan, the county seat of Iron County. Its elevation is 5,312 feet (1,619 m). Although Newcastle is unincorporated, it has a post office, with the ZIP code of 84756. The population was 247 at the 2010 census.
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