Decatur is an unincorporated community in eastern Byrd Township, Brown County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 45115. It is located along State Route 125, an east-west highway.
Decatur has been known as both St. Clairsville and Hard Scrabble. It was laid out circa 1802.
Decatur was described in 1833 as having two stores and one tavern.
- Zip Code Lookup
- The History of Brown County, Ohio. Higginson Book Company. 1883. p. 702.
- Kilbourn, John (1833). "The Ohio Gazetteer, or, a Topographical Dictionary". Scott and Wright. p. 176. Retrieved 12 December 2013.
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