Use Google Geolocation to complete addresses and find zip codes
Finding zip codes or completing partial addresses can be extremely valuable to a business but there is not a great way to accomplish it. If you have development experience, you could use one of Google's API's to parse your address data, but that is not a great use of time.
Using the Geolocation Object, you can access the power of Google Maps to complete addresses and find zipcodes. Just connect your address data to the Geolocation Object and indicate which result you would like, full addresses or just zip codes.