Casstown is a village in Miami County, Ohio, United States. The population was 270 at the 2020 census. It is part of the Dayton Metropolitan Statistical Area. Casstown was originally called Trimmensburgh, and under the latter name was laid out in 1832 by one Mr. Trimmens, and named for him. The present name honors Lewis Cas…Casstown is a village in Miami County, Ohio, United States. The population was 270 at the 2020 census. It is part of the Dayton Metropolitan Statistical Area. Casstown was originally called Trimmensburgh, and under the latter name was laid out in 1832 by one Mr. Trimmens, and named for him. The present name honors Lewis Cass, an American military officer, politician, and statesman. A post office called Casstown has been in operation since 1846.
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