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 or's location search, or something similar.



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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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