Check Zip Code Plugin

Hello, I am in need of a Wordpress plugin to do the following: Overview: I need a plugin that will allow my site visitor to enter a zip code (Five digit code like 61018) and when they press "Enter" or "Check" the plugin will check their Zip code against a list of Zip codes in a data base. If it is in the database they will be direct to a certain page and if it is not in the data base they will be taken to a different page. Details: I need too be able to add many different data bases, for different products. I am imagining that it would function something like this. I could upload a .TXT file to my hosting with a list of Zip codes, one .TXT file for each product. In the plugin admin, I could build a different "Check Button" for each product and choose which .TXT file that button will check. Each "Check Button" Will have a short code that I can enter in my sidebar to show that button and carry out the function. There may be an easy or better way to do this, but this was my idea on how it could work. Thanks D