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In 1983, the U.S. Postal Service introduced an expanded ZIP Code system that it named ZIP+4, often known as "plus-four codes", "add-on codes", or "add-ons". 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 ...
The ZIP Code or ZIP+4 code is encoded in half- and full-height bars. [1] Most often, the delivery point is added, usually being the last two digits of the address or PO box number. The barcode starts and ends with a full bar (often called a guard rail or frame bar and represented as the letter "S" in one version of the USPS TrueType Font ) and ...
If the address is valid, it is assigned a ZIP+4 code something like this: 12344-5678, where the first five digits are the ZIP code and the trailing four digits are the delivery range. An address with a ZIP+4 code (or nine-digit ZIP code) is considered to be valid. In most cases, this means that the address is deliverable.
Your billing zip code, or credit card postal code, is the five-digit number on the bottom right, which in this sample is 90210. This would be the zip code associated with your billing address.
Known as the ZIP Code with five digits 99999* or the ZIP+4 Code with nine digits 99999-9999* (while the minimum requirement is the first five digits, the U.S. Postal Service encourages everyone to use all nine).
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In a database, storing the ZIP+4 code in a 10 character field (with the hyphen) allows easy output in the address block, and storing the check digit in a 3-digit field (instead of calculating it) allows automatic checking of the validity of the ZIP+4 and delivery point fields in case one had been changed independently.
There is an extended format of the ZIP Code known as the ZIP+4, which contains the basic five-digit ZIP Code, followed by a hyphen and four additional digits. These digits identify a specific delivery route, such as one side of a building, a group of apartments, or several floors of a large office building.