St. Martin is an unincorporated community and former village in Brown County, Ohio, United States. The community is served by the Fayetteville post office. The population was 129 at the 2010 census. In November 2011, voters chose to unincorporate St. Martin, and it now falls solely under the jurisdiction of Perry Township.
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Coordinates 39°12'52.226" N -83°53'35.744" E
