Lochgelly, originally named Stewart, is an unincorporated community in Fayette County, West Virginia, United States. Lochgelly is 2.5 miles north of Oak Hill. Lochgelly has a post office with ZIP code 25…Lochgelly, originally named Stewart, is an unincorporated community in Fayette County, West Virginia, United States. Lochgelly is 2.5 miles north of Oak Hill. Lochgelly has a post office with ZIP code 25866.