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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.

A ZIP+4 Code uses the basic five-digit code plus four additional digits 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, a post office box, or any other unit that could use an extra identifier to aid in ...

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 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.

The debit card zip code refers to a user's billing address postal code. You can not change your zip code, but you can change your password at any time. The password combination may vary depending on the banking guidelines. But the zip code will always be the same: a combination of a five-digit letter.

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 segment can be a city block, a group of apartments or other mail receiving units that could benefit from the use of an additional identifier. An example of a ZIP+4 ZIP code is 99577-0727.

Hence, there are 10,000 possible 4-digit zip codes if there are no restrictions on the digits used.

Some still refer to ZIP codes as US postal codes. The term ZIP stands for Zone Improvement Plan. The basic 5-digit format was first introduced in 1963 and later extended to add an additional 4 digits after a dash to form a ZIP+4 code. The additional 4 digits help USPS more precisely group mail for delivery.

1. Census tracts are polygons and cover a well-defined geographic area. ZIP codes are clusters of lines; the U.S. Postal Service does not define ZIP Code boundaries. A very large number of 5-digit ZIP Codes are P.O.