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I suppose the real question should be, what business case am I trying to solve for? 9 digit zip codes are not free. I don't think that they are static either. As delivery routes are updated with new construction (an example) new codes are created. I'm sure that there is some logic where values like 0000 don't exist and if you see that number then it could be fake.
Generally, firms need the value as part of CASS certification requirements for postal discounts. The value alone might give you an idea of the deliverability of an address if you assume that the presence of a non-empty value means that at some point in time, the address was verified. Alteryx provides CASS as a data service within Alteryx ($ extra). You might look to MellisaData for other lookup needs.
Alteryx ACE & Top Community Contributor
Chaos reigns within. Repent, reflect and reboot. Order shall return.
Thanks Mark. We have CASS but it’s missing around 300 zips for Illinois that we need to map as part of a territory production workflow.
Maybe I can justify the purchase. Had to do due diligence before asking for funds though.
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