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Depends on what your goal is. The USPS has a number of products that do this kind of thing (See https://ribbs.usps.gov under Address Quality Services).

So if you are looking for something specifically to clean up or test software that cleans up USPS addresses, there you go.

If you want something that takes random address-looking things and tries to find a USPS address that matches it, that's harder :)




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