Madison Mills, OhioMadison Mills is an unincorporated community in Madison Township, Fayette County, Ohio, United States. It is located along Harrison Road, between Bloomingburg and Mount Sterling.HistoryA large gristmill called Madison Mills was built at the site in 1859. The Madison Mills Post Office was established on December 12, 1866, but was discontinued on May 31, 1942. The mail service is now sent through the Mount Sterling branch.