Marathon is an unincorporated community in eastern Jackson Township, Clermont County, Ohio, United States. Although it is unincorporated, it had a post office, with the ZIP code of 45145. It lies along U.S. Route 50.
Marathon was originally called Cynthiana, and under the latter name was laid out in 1838. A post office called Marathon was established in 1845, and remained in operation until it was discontinued in 2011.
- Zip Code Lookup
- Everts, Louis H. (1880). History of Clermont County, Ohio, with Illustrations and Biographical Sketches of Its Prominent Men and Pioneers. Philadelphia: J.B. Lippincott & Co. p. 551.
- "Clermont County". Jim Forte Postal History. Retrieved 16 January 2016.
- "Postmaster Finder". United States Postal Service. Retrieved 16 January 2016.
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