|POST OFFICE STATION 17||Foreign
There is no one standard way to find foreign zips. (Most countries call them postal codes,
by the way; if you would like to learn why we call them zip codes, click
However, there is a good list of resources for this maintained by Columbia University here.
The International Postal Union coordinates between all the world's national post offices and has an extensive website here. It does tend to be written for mail professionals, though.