The Indian Postal Service has designated 9 specific PIN regions across the country,
out of which 8 are geographical regions and the 9th is reserved for the Indian Army.
Structure of Pin Code (Postal Index Number)
India is such a vast country with so many cities, towns and villages that finding
the right place or person can be a real challenge for the Indian Postal Service
(and for courier services). In order to make the process of delivering letters and
parcels more efficient the Indian Postal service introduced the 6 digit Postal Index
Number (PIN) Code on 15 August 1972.