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• Codes
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  • National Address and Zip+4 Browser
  • National Address Server
  • Switchboard
  • Telephone Directories on the Web
  • U.S. Zipcodes 4-Digit Suffix
  • Who Where?
  • Zip+4 Codes Queries (U.S. Post Office)
• Gazetteer of the U.S. (Census Bureau)
• Maps for Medieval Studies
• MapQuest
• METRO Subway Map (Washington, DC)
• Perry-Castañeda Map Library
• Rapid Transit System Maps
• Washington DC Map
• Travelocity (American Airlines' SABR System)