GPS, Zip Code DB

Hello, I am searching for a database that I can write a PHP
application against. I am not looking for bulky packages, or anything
fancy or maps, ... just some raw SQL data I can mix & match from
tables, ... stuff like Zip codes, Latitude and Longitude, and any
other basic address & coordinate info. I can cross reference and tie
into..... anything that can help me. Any ideas?

Thank you in advance for help. Best wishes, Sara