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Free Postal & Zip Code Lookups
Provides ZIP codes by city and county, within a specified radius, distance between ZIP codes, and other information.
Postal Addressing Systems in Member Countries
From the Universal Postal Union, the site provides PDF documents on formatting standards for international addresses.
A virtual library of postal information from the U.S. Postal Service, including publications such as the Domestic Mail Manual and the International Mail Manual.
United States Postal Service
The official USPS web site, including stamp information; mail tracking and delivery confirmation; ZIP code lookup
and address information; rate calculators; and change of address information.