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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. It is a 6 digits long code with each of the digits denoting a particular meaning.

The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? 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.

Initially, the zip code was only a two-digit number: the first denoted the city, the second denoted the state. But as the need for delivery expanded, so did the concept of the zip code. As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone.

The number of digits. A 9-digit ZIP code is a further subdivision of a 5-digit ZIP code. One 5-digit ZIP code might cover a small city or up to 10,000 post office boxes. One 9-digit ZIP code might cover a few blocks with less than 100 addresses, or ONE post office box.

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.

So what do the extra numbers mean? 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.

United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area.

This is because ZIP code boundaries are based on mail routes and delivery points rather than geographic factors. The U.S. Post Office Department, predecessor to USPS, developed a zoning address system in 1943 as a way to make sorting and delivery of mail easier.