http://www.infobel.com/teldir/
Use this page to find the zip code (+4) for a street address.
http://www.usps.com/zip4/citytown_zip.htm
This page will tell you all the cities that fall into a zip code, or all the zip codes that fall into a city.
http://www.canadapost.ca/tools/pcl/bin/default-e.asp
http://www.unc.edu/~rowlett/units/codes/country.htm
Includes the individual country codes set by the ISO for mail and e-mail.
http://www.uga.edu/inside/contact.html
http://search.bigfoot.com/index.jsp
http://www.infospace.com/info/
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