- http://www.usps.gov/ - The United States Postal Service has an official website that brings you postal information from around the country. Zip codes, addresses, and tips on packages are just a few of the features at this site.
- http://postinfo.net/links/ - PostInfo brings you postal information from around the world. This is a great postal resource wherever you live.
- http://www.zipmath.com/ - At ZipMath.com you can find in a database the nearest address to a given zip code, the distance between two zip codes, all zip codes located within a radius, the zip code of a city, and geographical information about any zip code.
- http://link-usa.com/zipcode/ - ZipFinder lets you find any zip codes within a specified radius, the distance between two zip codes and it helps you find zip codes for any city or town in the United States.
- http://www.refdesk.com/factpost.html - The RefDesk brings you the most comprehensive list of postal resources on the internet. Their links are in alphabetical order, or you can run a search if you think you can find a specific topic.
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