Pin Code, What it is?

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Pin Code ( Postal Index Number) is a crucial a part of any address in India.
But why is that important and the way does it help the postal department?
Here is making sense of the 6 digit PIN CODE. (search here)The PIN system was Launch in India on 15 August 1972 by
Shriram Bhikaji VelankarThere are 9 Postal regions in the India.
The first 8 are geographical regions and Last is reserved for
the Army Postal Service(APS)

The first digit indicates regions.
The second digit indicates one of the postal circles (States) Or Sub-Region.
The third digit indicates a arranged district. The last 3 digits refer to thePost Office

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