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Telephone Numbers and Zip Codes

• Area Code Listing by Number (Bennet Yee)
• Area Code Map (North American Numbering Plan Administration)
• Area Decoder (AmeriCom)
• Carnegie Mellon Directory (Carnegie Mellon users only)
• Leadership Directories (Carnegie Mellon users only)
  This source contains directories for non-profits, corporations and financial companies, federal, regional and local government, law offices, courts, news media, and foreign representatitves. LD features up-to-date direct phone numbers and address information, and is searchable by many criteria.
  
• National Address Server
• SuperPages (Verizon)
• Switchboard.com
• Telephone Directories on the Web
• WhoWhere?
• ZIP Code Lookup and Address Information (U.S. Postal Service)