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Hartford, Connecticut Hartford, Iowa Hartford (định hướng) Hartford, Alabama Hartford, Wisconsin Hartford, Kansas Hartford, Arkansas Hartford, Ohio Hartford, Illinois Hartford, Quận Trumbull, OhioTài liệu tham khảo
WikiPedia: Hartford,_Iowa http://factfinder2.census.gov/faces/tableservices/... http://www.census.gov/geo/www/gazetteer/gazetteer2... http://data.iowadatacenter.org/datatables/PlacesAl...