The whole world has postal codes. Some are simpler than others. It would be nice to see an API like this one that supported more than just one country.
"In February 2005, 117 of the 190 member countries of the Universal Postal Union had postal code systems. Countries that do not have national systems include Ireland and Panama."
"In February 2005, 117 of the 190 member countries of the Universal Postal Union had postal code systems. Countries that do not have national systems include Ireland and Panama."
http://en.wikipedia.org/wiki/Postal_code