This is a utility that lets you lookup where a United States zip code is located in the nation. It was created by an MIT student while pursuing his Ph.D. It can show you what city a specific zip code is related to as well as give you an idea of how the postal code system is designed.

As far as I could tell it is pretty accurate and I couldn’t come up with a zip code that I knew that wasn’t listed. It is an interesting utility that is neat to look at, but not necessarily all that practical. I don’t think there are too many people out there constantly checking zip codes on it (unless maybe you work in package delivery).

http://acg.media.mit.edu/people/fry/zipdecode (requires Java)

Thanks to Tom Phillips from John Carroll University for sending this one in.