Coalburg, Ohio, rarely Coalburgh, is an unincorporated tract in northwestern Hubbard Township, Trumbull County, at approximately 41 degrees and 11 minutes North, 80 degrees and 35 minutes West. It was never a city, a town or a village. Its only official station, a post office, was closed in 1913, when the dwindling population could no longer support it. Although listed in the 1940 census enumeration district descriptions as a separate entity to the Hubbard township, no population figures were recorded.