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ZIP codes are a type of postal code used by the United States Postal Service to route mail. First introduced by the Post Office Department in 1963, ZIP stands for Zone Improvement Plan, and was initially established to help the USPS deliver packages. Today it is used to ship almost anything to an address.

First digit reflects region in India, second the sub-region, third the sorting district, and last three represent the post office code. Thus the first 3 digits collectively indicates the postal district while the last 3 digits designates the specific post office within the district.

History & Development. The ZIP in ZIP Code stands for Zone Improvement Plan, and it was introduced July 1, 1963, as part of a larger Postal Service Nationwide Improved Mail Service (NIMS) plan to improve the speed of mail delivery.

PIN code stands for Postal Index Number code. Also known as Zip code or area postal code, Pin code is the post office numbering code system used by the postal service of India, India Post. The PIN was first introduced in India on August 15, 1972.

If you want to improve the chances that the letter will make it to its destination quickly, you should use the five-digit ZIP code plus the four additional numbers that are specific to the area. To format, write the ZIP code with a hyphen afterward and then the four additional numbers will immediately follow that.

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.

Structure of Pin Code/Postal Code The first digit represents the region in India. The second digit is the sub-region, while the third digit is the sorting district. The last three digits represent the particular post office within the district.