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Centralia is a borough and ghost town in Columbia County, Pennsylvania, United States.
Its population has dwindled from over 1,000 residents in 1981 to 12 in 2005 and 9 in 2007,
as a result of a mine fire burning beneath the borough since 1962. Centralia is now the
least-populous municipality in Pennsylvania, with four fewer residents than the borough of S.N.P.J.