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 was originally called St. Clairsville, and under the latter name was laid out around 1802. A post office called Decatur has been in operation since 1817.
Looking west on Ohio Highway 125 in Decatur.
- ^ Zip Code Lookup
- ^ The History of Brown County, Ohio. Higginson Book Company. 1883. p. 702.
- ^ "Brown County". Jim Forte Postal History. Retrieved 17 December 2015.
Coordinates: 38°48′56″N 83°42′14″W / 38.81556°N 83.70389°W