Sullivan is an unincorporated community and census designated place in central Sullivan Township, Ashland County, Ohio, United States. It has a post office with the ZIP code 44880.[1] It lies at the intersection of U.S. Route 224 with State Route 58.
left|thumb|Old Sullivan High SchoolSullivan was laid out in 1836.[2] A post office called Sullivan has been in operation since 1828, which was closed in the summer of 2015.[3]