I have to agree with Randy. The ZIP Code is part of the U.S. address, just as much as a postal code is part of a Canadian, UK or other address. I think it's likely to be considered a technical, rather than substantive, violation, but even technical violations can be problematic if there are any other cracks in your BSA/AML compliance program.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8