Create a Google Maps Overlay from Multiple Zip Codes

I need a script/webpage that: Generates KML files from a list of United States Postal ("Zip") Codes and a list of places, as inputted by a user on a very basic website. The final KML for the zipcodes would have colored overlays for the areas of the zipcodes and the second KML would have placemarks for the individual places. Please see attached file for example of input method and sample data set. **General Problem Statement:** I have eight different people in charge of eight different geographic regions. Each area of responsibility consists of a bunch of different zip codes (which change from year to year) with certain addresses of interest. I'm looking for a way to show each geographic area of responsibility and the particular places in Google Maps.