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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.

To create a personal Zip, a postal customer would go to a postal web site, authenticate who they are, much as they do today to sign up for Informed Delivery, and provide their current address and, optionally, email address. The system would provide them their own 11 (or 12) digit Personal Zip Code.

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.

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.

Unknown, empty, or otherwise invalid integers are represented by 0. Zip codes will require leading zeros to correctly format 5-digit and zip-plus-4 codes. Zip-plus-4 notation using a plus-4 of all zeros (-0000) is not valid - use the 5-digit instead.

A 5-Digit ZIP code represents a USPS delivery area. A 9-Digit ZIP code, also known as a ZIP+4 code or an extended ZIP code, includes the same information as the 5-Digit ZIP code, plus additional information about a specific delivery route within the delivery area.

ZIP & ZIP+4 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.

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.

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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).