Cannonsburg is an unincorporated community in Hancock County, in the U.S. state of Ohio.
History Cannonsburg was laid out in 1839. A post office called Cannonsburgh was established in 1840, the name was changed to Cannonsburg in 1894, and the post office closed in 1902.
References
See also Dellroy, Ohio, a village once known as Cannonsburg.