Carbon Hill is an unincorporated community and census-designated place in central Ward Township, Hocking County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 43111. As of the 2010 census the population of the CDP was 233.State Route 278, located on the western edge of Carbon Hill, is its main north-south street. It is 3 miles north of Nelsonville.Carbon Hill was laid out in 1873. Coal was extensively mined there. This industry accounts for the community's name. A post office called Carbon Hill has been in operation since 1879.The residents of Carbon Hill are served by the Nelsonville-York City School District and Nelsonville-York High School.