Greenville is an unincorporated community in eastern Beaver County, Utah, United States. It lies along State Route 21 west of the city of Beaver, the county seat of Beaver County. Its elevation is 5,666 feet (1,727 m), and it is located at 38°15′16″N 112°42′45″W﻿ / ﻿38.25444°N 112.7125°W﻿ / 38.25444; -112.7125 (38.2544146, -112.7124431). Although Greenville is unincorporated, it has a post office, with the ZIP code of 84731. Greenville was first settled in 1861.