Centralia is a borough and near-ghost town in Columbia County, Pennsylvania, United States. It is part of Northeastern Pennsylvania. Its population declined from 1,000 in 1980 to five residents in 2020[8] because a coal mine fire has been burning beneath the borough since 1962. Centralia, part of the Bloomsburg–Berwick metropolitan area, is the least-populated municipality in Pennsylvania.[9] It is completely surrounded by Conyngham Township.