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The four extra numbers are added after a hyphen to complete the ZIP+4. 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 will still be delivered as long ass the rest of the address is correct. The USPS system corrects bad Zip Codes automatically by looking up the address in the database of all good addresses. We live in the 21st century and this is so easy for the computers to do now.

Looking up a ZIP+4 with the USPS ZIP Code™ Lookup Tool Enter the address you want to look up in the “Street Address” field. You can also enter a city and state or a ZIP code to narrow down your search. Click the “Find” button to search for the ZIP+4 code associated with the address.

What is the four-digit extension? It represents a specific delivery route within that overall delivery area. For PO boxes, the four-digit extension usually includes the PO box number. Including the last four digits means mailings will arrive to their intended destination faster, as well as discounts on bulk mailings.

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.

No! Just use the first five digits. USPS computers will read the address then look it up and supply all eleven numbers needed for delivery and print a barcode containing all those numbers. Writing any more than the first five digits will not speed up delivery at all.

The five-digit code which initially specified an area or a part of a town was no longer accurate or efficient enough. So, USPS created 9-digit ZIP Codes to ensure fast and accurate mailings.