Zip Code reverse lookup

[Guest]

I have created a feedback form for visitors to an airshow and the results are shown here http://hollisterairshow.com/feedback-results.php. I would like to add a column beside the zip code showing the city. On looking around I have found several free zip code lookup sites and temporarily added a link to one of these on the feedback results page,  but I think my users would find it more useful if I just show the city alongside the zip code. I'd really appreciate suggestions on how to do this.

Thanks.

Tony

[Guest]

Never mind. I found a downloadable list of 5 digit zip codes with city/ state so imported it (all 42,000+ entries) into a table on an existing db.