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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.

In the United States, ZIP codes are a type of postal code. Individuals who mail letters or packages via the United States Postal Services (USPS) are required to write the code as part of the address. This five-digit code helps ensure that parcels get to their intended destination faster.

Your ZIP+4 is a basic five-digit code with four digits added as an extra identifier. It helps to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, or a post office box.

An extended ZIP+4 code was introduced in 1983 which includes the five digits of the ZIP code, followed by a hyphen and four additional digits that reference a more specific location. However, initial attempts to promote universal use of the new format met with public resistance, and today the +4 code is not required.

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.

The final 4 digits: ZIP+4 codes include an addition 4 digits that identify and tell the postal carrier the geographical segment present within a zip code delivery area.