Sullivan is an unincorporated community in central Sullivan Township, Ashland County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 44880. It lies at the intersection of U.S. Route 224 with State Route 58.
Sullivan was laid out in 1836. A post office called Sullivan has been in operation since 1828, which was closed in the summer of 2015.
Coordinates: 41°01′41″N 82°13′20″W / 41.02806°N 82.22222°W