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Postal CodesRSS

www.westminster.ca/postal-code-lookup.php

Find postal codes in Canada and in the U.S. from this commercial site.

www.cedar.buffalo.edu/adserv.html

Given a valid U.S. postal address, this server attempts to rewrite the address in the proper format along with the ZIP+4 code. Location maps are also available.

www.usps.com/zip4/

Find ZIP codes for addresses, locate the four-digit extension, associate a ZIP Code with city/state names, decipher postal abbreviations, and more.