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Depends on how ?wrong? it is. The mail will go to the correct office (it's sorted by zip code). Once there, if it is something that can be figured out, they may be able to get it to the correct destination. If it's COMPLETELY wrong, it will be considered undeliverable and will be returned to sender.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

A United States postal code, for example, might be either five digits or five digits followed a hyphen (dash) and another four digits (12345-1234). If you are validating US postal codes, allow for both conditions. The following rule validates a field that can be five digits, five digits + dash + 4 digits, or blank.

The ZIP Code Boundary Review Process requires any municipality or community group seeking a ZIP code change to submit the request in writing to the USPS district manager who is responsible for the area along with any rationale and justification.

First digits The first digit of the ZIP code is used as follows: 0 = Alaska (AK), Connecticut (CT), Massachusetts (MA), Maine (ME), New Hampshire (NH), New Jersey (NJ), Puerto Rico (PR), Rhode Island (RI), Vermont (VT), Virgin Islands (VI), APO Europe (AE), FPO Europe (AE)

You can contact the IRS and request that they change the zip code via an IRS Form 8822. However, the USPS mail sorting should be able to figure out the discrepancy so long as the address you provided is valid within the City/State provided. You can also go to your local post office and fill out an Mail Recovery form.