Cortsville is an unincorporated community in Clark County, in the U.S. state of Ohio.
The first settlement at Cortsville was made in 1830. A post office called Cortsville was established in 1837, and remained in operation until 1841. In 1881, Cortsville had 57 inhabitants.
Coordinates: 39°47′47″N 83°43′16″W / 39.79639°N 83.72111°W