Sullivan, OH

Sullivan is an Ashland County CDP at the meeting point of U.S. Route 224 and State Route 58, with a post-office story older than the current map label. The community was laid out in 1836, but a Sullivan post office had been operating since 1828 before closing in 2015. That gives the place a useful local timeline: mail service first, town plan later, highway junction still carrying the name. Sullivan is an unincorporated Ohio community in Sullivan Township, with its identity tied to a crossroads and a post office that lasted well into the modern era.