Centralia is a borough and near-ghost town in Columbia County, Pennsylvania, United States. Its population has dwindled from more than 1,000 residents in 1980 to only 7 in 2013—a result of the coal mine fire which has been burning beneath the borough since 1962. Centralia, which is part of the Bloomsburg–Berwick metropolitan area, is the least-populated municipality in Pennsylvania. It is completely surrounded by Conyngham Township.All real estate in the borough was claimed under eminent domain in 1992 and therein condemned by the Commonwealth of Pennsylvania. Centralia's ZIP code was discontinued by the Postal Service in 2002. State and local officials reached an agreement with the seven remaining residents on October 29, 2013, allowing them to live out their lives there, after which the rights to their houses will be taken through eminent domain.HistoryEarly historyMany of the Native American tribes in what is now Columbia County sold the land that makes up Centralia to colonial agents in 1749 for the sum of five hundred pounds. In 1770, during the construction of the Reading Road, which stretched from Reading to Fort Augusta (present-day Sunbury), settlers surveyed and explored the land. A large portion of the Reading Road was developed later as Route 61, the main highway east into and south out of Centralia.