Newcastle, UT

Newcastle is an Iron County census-designated place with a 2020 population of 330 residents, a farming community in southwestern Utah along State Route 56. The highway runs 30 miles east to Cedar City and across the open country toward Nevada, giving Newcastle a long-distance role despite its small size. The post office uses ZIP 84756, and the community was founded in 1910 by residents of the more isolated settlement of Pinto. That move brought homes and fields to a route with better access in this part of the county.

Farming still defines Newcastle's working map. A dairy, orchards, greenhouses growing houseplants and tomatoes, and fields sit around the settlement, with the red-rock and high-desert country of Iron County beyond them. The place is unincorporated and county-governed, so the post office, highway, farm lanes, and local businesses carry the town's daily structure. Newcastle is a small southwestern Utah community where a 1910 relocation story meets present-day agriculture along one long state road.