>Does anyone know of a program that authenticates addresses and zip codes?
>
>I'm looking to integrate into a VFP app some sort of methodology to validate zip codes entered by the user. The third-party app could charge you for this or not... doesn't matter. The most important part would be that it was available through the net or a .dll that would allow me to programmatically manipulate it. Furthermore, it would need to be a system that was dynamic and changed whenever the US Post Office changed or updated zip codes etc, to insure its current and accurate.
>
>Thanks for the help.
>Shawn Burke
>DRI Management Systems

The Post Office has this page:
http://www.usps.com/ncsc/lookups/lookup_zip+4.html
One of my clients wrote an OCX control that automates the lookup of the zip + 4 by passing the address entered by the user. The control parses the response for the zip+4 code. The post office could change the functionality at any time, or change the returned HTML that would make this control useless.
I use this control in some of my other apps and it works like a charm. If you would like to try it I'll post it.