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United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area. The first digit in a ZIP code represents a defined group of U.S. states.

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 ZIP code is the term used to describe the postal code system in the United States. It is a series of numbers that communicates information about people within different geographic groupings. There are two ZIP code systems within the United States, ZIP and ZIP+4.

ZIP Code? validation is the process of checking a postal address to make sure the ZIP is valid and matches the location in the address.

Yes, when using a ZIP+4 ZIP Code, the number must consist of five digits, a hyphen (or dash), and four digits. Improperly labeled mailpieces may progress slower through the mail system and may be returned to sender if the United States Postal Service® is unable to deliver the item.

The first number, between 0-9, denotes a geographic area of the U.S. The second two numbers of a zip code specify a specific region within that geographic area and the last two are meant to indicate a specific Post Office.

Stores want your ZIP code because, combined with your name from your credit card, they can use it to find out other information about you from commercial databases, like your full mailing address. They may even sell the information to data brokers, who sell it to other marketers.