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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.
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 ...
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.
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.
An 11 digit (plus check digit) barcode, containing the ZIP Code, ZIP+4 Code, and the delivery point code. 62 bars total. This is usually referred to as the DPBC, or Delivery Point Bar Code. By including delivery point information, it enables the Postal Service to sort mail into delivery point (address) sequence. [2]
U.S. ZIP codes. Range 00801–00851. Uzbekistan: 13 May 2005 UZ: NNNNNN [30] Vanuatu: VU: no codes Vatican: VA: 00120 Single code used for all addresses. Part of the Italian postal code system. Venezuela: VE: NNNN, NNNN-A Vietnam: VN: NNNNNN First two indicate a province. Wallis and Futuna: WF: 986NN Overseas Collectivity of France. French ...