The PIN code system was introduced in 1972 by the postal department. Before the PIN code system, the mails were sorted based on district. A unique six digit code has been assigned for every post office in India based on which the mails will be forwarded. Totally there are 155,000 post offices and 25,000 of which are departmental post offices (DPO). The rest are extra departmental post offices or branch offices (BO).
There are nine PIN zones in India and the first digit of the PIN code represents the zone.
|
First digit of PIN |
Areas included |
|
1 |
Delhi, Haryana, Punjab, Himachal Pradesh, Jammu & Kashmir (including Pakistan administered Kashmir), Chandigarh |
| 2 |
Uttar Pradesh, Uttarakhand |
| 3 |
Rajasthan, Gujarat, Daman and Diu, Dadra & Nagar Haveli |
| 4 |
Goa, Maharashtra, Madhya Pradesh, Chhattisgarh |
| 5 |
Andhra Pradesh, Karnataka |
| 6 |
Tamil Nadu, Kerala, Pondicherry, Lakshadweep |
| 7 |
Orissa, West Bengal, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Andaman & Nicobar Islands |
| 8 |
Bihar, Jharkhand |
| 9 |
Army Post office (APO) and Field Post office (FPO) |
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. PIN codes of Mumbai start with 400001, where 4 shows the PIN zone and 40 determines the Sub region. Thane also belongs to the sub region “40”. Other sub-regions in Maharashtra include areas starting with PIN codes 41, 42, 43 and 44. The PIN code of Pune is 411001 and hence Pune belongs to sub region “41”. Kolhapur and Sangli also belong to the same sub region. Bhiwandi and Nashik belong to sub region “42”. Aurangabad belongs to sub region “43”. Nagpur has the PIN code 440001 and thereby belongs to sub region “44”. The third digit in PIN code indicates the sorting district within the region. The final three digits are assigned to individual post offices within the region.
The PIN code system is into the 40th year now and has certainly revolutionised the entire Indian postal system. Many parcel, cargo, freight and logistics providers sort their consignments and deliver them based on the Indian PIN code system.





