Marathon is an unincorporated community and Census-designated place in northeastern Jackson Township, Clermont County, Ohio, United States. [1] Although it is unincorporated, it had a post office, with the ZIP code 45145. [2] The current ZIP code is 45118. [3] It lies along U.S. Route 50.
Marathon was originally called Cynthiana; the town was laid out in 1838 under the latter name. [4] A post office called Marathon was established in 1845, [5] and remained in operation until its discontinuation in 2011. [6]
39°08′43″N84°00′23″W / 39.14528°N 84.00639°W