Are there any open source/free to use, commonly updated... either dumps or APIs that will let someone have zip codes and addresses validated?

Think monster.com or careerbuilder.com's location search, or something similar.

Thanks

Ryan

I've never come across a reliable (regularly updated) free address validation API.

I did find smartystreets... I have not used it, but I did sign up. Under 250 queries/mo. free. Seems like a good deal for a start-up, and the API looks simple using REST or JSON

You have any experience with them, or anything similar?

For work I had to implement one, can't remember which. But they had a decent WCF service.

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