why do some zip codes have 9 digits

why do some zip codes have 9 digits

why do some zip codes have 9 digits. There are some references to why do some zip codes have 9 digits in this article. If you are looking for why do some zip codes have 9 digits you've came to the right place. We have posts about why do some zip codes have 9 digits. You can check it out below.

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