Postal Index Number or PIN or Pincode is a code in the post office numbering or Post Code System used by India Post,theIndian Postal Administration
The code is six digits long
The PIN Code system was introduced on August 15,1972 by Shriram Bhikaji Velankar, an additional secretary in the Union Ministry of Communications
The system was introduced to simplify the manual sorting and delivery of mail by eliminating confusion over incorrect addresses, similar place names and different languages used by the public
There are 9 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, and 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 -Delhi,Haryana,Punjab,Himchal Pradesh,Jammu and Kashmir and Chandigarh
2 - Uttar Pradesh and Uttarakhan
3 - Rajasthan ,Gujarat,Daman and Diu,Dadra and Nagar Haveli
4 - Goa,Maharashtra,Madhya Pradesh and Chhattisgarh
5 -Andhra Pradesh,Karnataka and Telangana
6 - Tamil Nadu,Kerala,Puducherry and Lakshadweep
7Odisha,WestBengal,ArunachalPradesh,Nagaland,Manipur,Mizoram,Tripura,Meghalaya,Andaman and Nicobar Islands,Assam and Sikkim
8 - Bihar and Jharkhand
9 - Army Post office (APO) and Field Post office (FPO)