Rossburg, Warren County, OhioRossburg is an unincorporated community in Warren County, in the U.S. state of Ohio.HistoryRossburg was not officially platted. The community was named after Enoch A. Ross, the proprietor of a local tannery. A post office was established in the early 1830s as "Rossburg", and the name of the post office was changed in 1838 to "Butlerville".