Find area codes, city codes and country codes
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Search multiple resources at once.
Yellow pages and search directory for major cities.
"This website's mission is to provide our visitors with comprehensive and up to date information on how to dial internationally from the USA, Canada or from any other country. Telephone country codes and international area codes are displayed by country, with additional info featured such as city and cellular codes, telephone books. In addition we provide a comprehensive list of country and exit codes."
You can't use this to get an exact zip code by street address, but you can view zip codes by city, or find the longitude/latitude of a zip code (or city) here.