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• FirstGov.gov - Your First Click to the US Government
• GovSpot.com - US government, state government, Congress, government jobs & more!

• The White House Home Page
• Centers for Disease Control and Prevention
• Central Intelligence Agency
• CIA World Factbook
• Federal Bureau of Investigation
• FedWorld Information Network
• The Department of the Treasury
• IRS.gov - Digital Daily Welcome (sounds kinda scary, no?)
• Library of Congress
• NASA
• NARA | US National Archives & Records Administration
• NIST - National Institute of Standards and Technology
• PARKNET - The National Park Service
• POPClock Projection - Current estimated USA population
• Seismicity
• Thomas - Legislative Information
• Tiger Mapping Service
• USPS: The United States Postal Service
  USPS: The United States Postal Service
  Domestic Postage Calculator
  ZIP + 4 Lookup
  zipdecode (nongovernmental. way cool!)
  Change of Address - MoversGuide Landing Page
  
• US State Department - Bureau of Consular Affairs