As an independent agency of the government, the United States Postal Service homepage offers information on zip codes, address change, stamps, online billing, and variety of other topics.

Even if you aren't a stamp collector, this is a fascinating stop in your search for US postal service history. Be sure to click on their special selections like "Inverted Jenny, A famous stamp error." Excellent exhibits explain the...

Talks about the Church Street Station Post Office in New York City that was very near Ground Zero, and how the postal service continued to work post 9/11 in that area.

Here is a chart compiled by the United States Postal Service that determines how much postage is required for a letter, large envelope, postcard, and etc. Many links. Link to International Rate Calculator.

This search provided by the United States Postal Service will help you determine what zip code is associated with what city and vice versa.

You can use this international rate calculator provided by the US Postal Service to determine shipping cost for various mailings.