Zip Code Lookup via AJAX

zip code:
city:
state:
county:

Acknowledgments

• gdbm
  For many applications a full featured RDBMS is overkill and a plain text file is not fast enough. Solution? Use a constant database. (cdb, though less popular, works as well.)
• Google Maps
  This application catapulted AJAX into the forefront of developers' collective consciousness.
• G. Gold
  For creating this application.