- United States Postal Service (USPS)
 - Official site of the United States Postal Service (USPS), featuring postage rate calculator, Express Mail tracking, ZIP codes, change of address forms, and online ordering of stamps. - America's 1999 Stamp Program: The Nature of America
- Full-colour images of, and the stories behind, every stamp being issued by the United States Postal Service.
- Citizens' Stamp Advisory Committee
- Evaluates the merits of all stamp proposals.
- Consumer Information
- Domestic Calculator
- Provides assistance on calculating postal rates for domestic U.S. mail by package type, ZIP code, and weight information.
- Fundraising Stamps (Semipostal Research Stamp)
- Special stamps from the U.S. Postal Service whose sales raise money for research and support. Includes the Breast Cancer Research Stamp, the Heroes of 2001 Stamp, and the Stop Family Violence Stamp.
- International Calculator
- Offers United States Postal Service mailing rates and standards for shipping to international locations by package type.
- National Postal Customer Council
- Postal Service division dedicated to fostering working relationships between mailers and the USPS. Site features listings of regional councils.
- Post Office Locator
- Search for a U.S. Post Office by street, address, and city.
- Postal Inspection Service (1)
- PostalNews.com
- Contains an unofficial daily news digest of the U.S. postal world.
- United States Post Office Calendar
- Provides a calendar of important dates for the USPS, including holiday closing schedule.
- USPS City State / ZIP Code Associations
- Find all cities within a given ZIP code. From the U.S. Postal Service.
- USPS Jedi Master
- Star Wars and the United States Post Office team up with Star Wars stamps and R2-D2 mailboxes.
- USPS Prices
- Lists the U.S. postage rates for domestic and international services and offers information on Forever Stamps and an online calculator to determine exactly how much your mailing will cost.
- USPS Priority Mail
- Have mail and packages shipped within 2-3 days.
- USPS State Abbreviations
- List of the official two-letter U.S. state codes.
- USPS Store
- Features products and services from the U.S. Postal Service (USPS). Buy stamps, collectibles, mailing and shipping supplies, and educational products.
- USPS Track and Confirm
- Provides tracking for the delivery of Express Mail and Global Express Guaranteed and confirmation of delivery for domestic Priority Mail and Parcel Post. From the U.S. Postal Service (USPS).
- USPS: ZIP Code Lookup
- Find the ZIP code for a given address, search by city or company, or find all cities in a ZIP code. From the U.S. Postal Service.
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