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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.

Standard US ZIP codes The standard ZIP code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US ZIP code is 90210.

The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

Leave one space between the city and state and two spaces between the state and ZIP Code?. Use black ink on white or light-colored paper. Use a PO Box? address or street address?but not both. If the address includes a directional?for instance, ?NW? for northwest?be sure to use it.

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.

Due to an increase in population or to the improve postal operations, the US Postal Service® will occasionally add a new ZIP Code or change ZIP Code boundaries.

How to Change Your Address With the Postal Service Go to USPS.com/move to change your address online. This is the fastest and easiest way, and you immediately get an email confirming the change.Go to your local post office and request the Mover's Guide packet. Inside the packet is PS Form 3575.