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ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

Some entities are so large or specialized that they have their own ZIP code, including the Empire State Building, Dodger Stadium, the CIA, and New York's LaGuardia Airport.

"Unique ZIP codes are sometimes assigned based on the volume of mail at a particular address ? and only when a ZIP+4 will not satisfy delivery, distribution, and customer requirements," said U.S.Postal Service spokesman Xavier Hernandez, referring to the add-on code that further segments a geographic area.

The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits. The first five digits represent the 5-digit ZIP Code; the sixth and seventh digits (the first two after the hyphen) identify an area known as a sector; the eighth and ninth digits identify a smaller area known as a segment.

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.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone.

It is preferred that all City, State, and ZIP Code information be on a single line. If that is not possible, the ZIP Code, including the ZIP+4 Code, may be placed below the city/state information.

When writing an address all on one line or in a sentence, use a comma before the following elements: the apartment or suite number, the city, and the state. It's not necessary to use a comma before the zip code. Her address is 3425 Stone Street, Apt. 2A, Jacksonville, FL 39404.

Invalid zip code error is displayed when attempting to process a payment from your customer with a billing address outside the U.S. They may have a ZIP code (or Province code) that includes characters that do not meet the U.S. 5 digit standard.

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.