Dungannon, Columbiana County, Ohio
Dungannon is an unincorporated community in Columbiana County, Ohio, in the United States. History. Dungannon was laid out in 1835 by George Sloan when the Sandy and Beaver Canal was extended to that point. He named the community after Dungannon, Northern Ireland, his native home. A post office was established at Dungannon in 1840, and remained in operation until it was discontinued in 1903. The post office was originally spelt "Dunganon" before being changed to the current spelling of "Dungannon" in 1871.