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A 5-digit number that identifies a particular postal delivery area in the United 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.

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.

ZIP Codes for PO Boxes within the same city usually do not change. Please note that the ZIP+4 Code will likely include the actual PO Box number in the +4 part of the ZIP Code. For further information on how ZIP Codes are assigned to PO Boxes, please contact your local Post Office?.

In the United States, the basic ZIP Code is composed of five numbers. The first three numbers identify a specific sectional center facility?or central sorting facility?that serves a geographic region (typically a large part of a state).

If you only need to use an address checker to verify USPS addresses occasionally, the USPS Zip Code Lookup tool works to validate US postal addresses one at a time. It's easy enough to use, free, and requires no setup. The tool also returns addresses in USPS standardized format.

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.