Geographic Distance Queries?

[eluser]zimco[/eluser]
You might try looking at the file http://www.sanisoft.com/phpziplocator, it is a php class you might be able to drop right-in your CI applications/libraries folder and use.

Description: A simple class for finding distances between two zip codes, The distance calculation is based on Zipdy package found at http://www.cryptnet.net/fsp/zipdy/ written by V. Alex Brennen. You can also do radius calculations to find all the zipcodes within the radius of x miles.