Zip Codes/Postal Codes & Rates
Canadian Postal Codes
http://www.canadapost.ca/splash.asp
U. S. Postal Rate Calculator
http://postcalc.usps.gov/
World Postal Codes
http://www.execulink.com/~louisew/postal-links.htm
Zip Code Lookup and Address Information
http://www.usps.com/ncsc/lookups/lookup_zip%2b4.html