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The ZIP code system divided the U.S. into 10 zones, with each digit representing a location—from regional sorting centers to sectional subdivisions—allowing precise identification of an ...
The ZIP Code system (an acronym for Zone Improvement Plan [1]) is the system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly [ 2 ] ( zipping along ) when senders include the code in the postal address .
Part of the Danish postal code system. Grenada: GD: no codes Guadeloupe: GP: 971NN Overseas Department of France. French codes used. Range 97100 – 97190, which still includes the distinctive postal codes for Saint Martin and Saint Barthélemy. Guam: 1 July 1963 GU: NNNNN, NNNNN-NNNN U.S. ZIP codes. Range 96910–96932. Guatemala: GT: NNNNN
There are generally two widely accepted versions of a postal code: a ZIP code and a ZIP + 4 code. Established in 1963, ZIP codes are the most common and recognizable postal code used by the USPS.
The codes were assigned by NIST and each uniquely identified a state, the District of Columbia, or an outlying area of the U.S. These codes were used by the U.S. Census Bureau, the Department of Agriculture to form milk-processing plant numbers, some cash registers during check approval, and in the Emergency Alert System (EAS).
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.
Modern two-letter abbreviated codes for the states and territories originated in October 1963, with the issuance of Publication 59: Abbreviations for Use with ZIP Code, three months after the Post Office introduced ZIP codes in July 1963.
In the US Postal System, a delivery point is a specific set of digits between 00 and 99 assigned to every address. When combined with the ZIP + 4 code, the delivery point provides a unique identifier for every deliverable address served by the USPS. [1]