Sulphur Well is an unincorporated community located in Metcalfe County, Kentucky, United States. History Sulphur Well is named for a vein of mineral water a local landowner discovered while drilling for salt before the American Civil War. The landowner then began operating a hotel near the mineral well, and a village grew up in the area. By 1878, the community had a school, and a post office was established on July 30, 1879. In 1883, the community was reported to have a population of 100, with several stores, a hotel, and a flour mill. Geography The community is located in northern Metcalfe County along Kentucky Route 70. It is about west of KY 70's junction with U.S. Route 68. References Unincorporated communities in Metcalfe County, Kentucky