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The term ZIP is an acronym for Zone Improvement Plan; it was chosen to suggest that the mail travels more efficiently and quickly (zipping along) when senders use the code in the postal address. The term ZIP Code was originally registered as a service mark by the USPS; its registration expired in 1997.

In essence, both postal codes and zip codes serve a very similar purpose?which is appending additional information to an address to ensure fast and accurate mail delivery for users. Zip code refers to a type of postal code and is used primarily in the United States and the Philippines.

In 1943, a system of postal districts was formed for major cities. Each district was assigned a one- or two-digit code that senders would place in between the city name and the state name. This helped, but the increased volume of mail soon created a need for mechanization.

?the five-digit ZIP number is a structured code in which the first digit identifies one of ten large areas of the Nation, and the second digit indicates a State, a geographic portion of a heavily populated State, or two or more less populated States.

In 1963 the Post Office Department introduced the Zone Improvement Plan (ZIP) Code as a means to allow mail sorting methods to become faster and eventually be automated, but the innovation also created unimagined socio-economic benefits as an organizing and enabling device.

The term Postal Index Number (PIN) is popularly known as PIN Code/Postal Code in India. It is a code in the post office number of the postal code system which is used in India Post for segregating the mails. The PIN code consists of six digits.

Primary state prefixes. 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.