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.
- Zip Code Lookup
- Baughman, Abraham J. (1909). History of Ashland County, Ohio. S. J. Clarke Publishing Company. p. 175.
- "Ashland County". Jim Forte Postal History. Retrieved 27 December 2015.
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