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?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.

Postal Index Number (PIN) or PIN Code is a 6 digitcode of Post Office numbering used by India Post. Indian Postal Service introduced the 6 Digit Zip codeor PIN Code on 15th August 1972, inorder to make the process of delivering letters and parcels more efficient.

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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.

The first number in the code represents a general geographic area of the nation, ?0? in the East, moving to ?9? in the West. The next two numbers represent regional areas, and the final two identify specific Post Offices.

The code became a tool for organizing and displaying demographic information while also allowing for the efficient sorting and dispatching of mail. Over the span of 50 years, the ZIP Code was expanded from 5 digits to 9 and then to 11, with each digit indicative of the address location.

The standard ZIP code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US ZIP code is 90210.