The full Form Of Pin code is Postal Index Number. Pincode is the postal coding system used by the Department of Posts, India. The same Pincode number may be assigned to the number of post post offices usually within a single administrative circle. The PINcode is 6 digits long. First digit reflects region, second the sub-region, third the sorting district, and last three represent the post office code. India has nine PIN zones.

According to the India Pin Code Directory, the PIN code is a number of 6 digits which is different for every India post zone of the post office in the whole of India. The All India Pincode Directory contains all PIN-code lists across India, including geocodes and other relevant information such as office name, office type, distribution status, division, region, circle, Taluk, district, and state name. Latest All India Pin Code Directory including all changes made up to March 2015.