I am just wondering, I see a lot of sites these days, that have it where you can give a form your zip code and it will lookup the city that corresponds to that zip code, and if a few choices it will ask them, which city it is.

Is there a module that can do this, or where can I find information on a way to do this?

I searched Cpan for zipcode and state but could not find anything useful.

Any tips you have would be very much appreciated!