A Postal Index Number or PIN or Pincode is the post office numbering system used by Indian post. The code is 6 digits long. The PIN was introduced on 15 August 1972.
There are nine PIN zones in India, including eight regional zones and one functional zone (for the Indian Army).
The first digit of the PIN code indicates the region.
The second digit indicates the sub-region.
The third digit indicates the sorting district within the region.
The final three digits are assigned to individual post offices.
The 9 PIN zones cover the Indian states and union territories as follows:
1. Haryana, Punjab, Himachal Pradesh, Jammu and Kashmir (including Pakistan-administered Kashmir), Chandigarh
2. Uttar Pradesh, Uttrakhand
3. Rajasthan, Gujarat, Daman and Diu, Dadra and Nagar Haveli
4. Goa, Maharashtra, Madhya Pradesh, Chhattisgarh
5. Andhra Pradesh, Karnataka
6. Tamil Nadu, Kerala, Puducherry, Lakshadweep
7. Odisha, West Bengal, Arunachal Pradesh, Nagaland, Manipur, Tripura, Meghalaya, Andaman & Nicobar Island, Assam.
8. Bihar, Jharkhand
9. Army Post office (APO) and Field Post office (FPO)
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