Pincode also referred as PIN is a six digit code used by the Indian postal department for numbering the post offices or locations in India. The full form of PIN is postal index number.
In India, there are 29 states and 7 union territories. The states are further divided into districts and further into small divisions.
There are 9 postal zones in India. The first digit of the PIN code indicates the region, the second digit indicates the sub region and the third digit indicates the district. The remaining three digits are assigned to the individual post offices.
At a high level the post offices are divided into delivery and non-delivery offices. The delivery post offices handles receiving and delivering of the the mail. The post offices are further categorized into General post office(GPO), Head office(HO), Sub Office(SO) and Branch office(BO). The GPO, HO and SO offices are located in urban areas and the BO offices are located in rural areas. In India, there are nearly 19000 pincodes and roughly 1,50,000 post offices.