Zip Codes

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2000 U.S. Gazetteer: The Census 2000 gazetteer of counties, county subdivisions, places and ZIP Code Tabulation Areas for the 50 states, the District of Columbia and Puerto Rico.

Commercial Zip Code Database: The US zip code database.

TIGER/ZIP+4 File (Topological Integrated Geographic Encoding and Referencing): Tool that helps mailers explore new markets by gathering and manipulating data to uncover potential business areas.

ZipInfo.com: Site for ZIP code databases and programs.