West Jefferson (established 1833 ) is a village in Madison County, Ohio, United States. The population was 4,137 at the 2020 census. Located along U.S. Route 40, the village has a fairly close relationship with the surrounding township, which include various out-of-corporation-limit neighborhoods (including Haymarket Road, Olmstead Road, Forrest Lake Estates, Goodson Road/Enchanted Valley, West Point/Lake Darby, Gillivan, and North and South Road).