Postal Index Number (PIN) is also called as Pin Code which is used to formally sort and deliver the mail. Stick code is a 6-digit code of Post office numbering utilized by Indian post. There are 9 PIN regions in the country. The first 8 are geographical regions and the digit 9 reserved for the Army Postal Service. The first digit indicates one of the regions.
The first 2 digits together indicate the sub region or one of the postal circles. The first 3-digit together indicate a sorting/revenue district. The last 3-digit refers to the delivery Post Office. The fourth digit speaks to the course on which a Delivery office is situated in the sorting area. The last two digits speak to the conveyance office inside the sorting locale beginning form 01.
The principal digit of the PIN shows as underneath
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| First Digit | Region | States Covered |
| 1 | Northern | Delhi, Haryana, Punjab, Himachal Pradesh and J & K |
| 2 | Northern | Uttar Pradesh and Uttaranchal |
| 3 | Western | Rajasthan and Gujarat |
| 4 | Western | Maharashtra, Madhya Pradesh and Chhattisgarh |
| 5 | Southern | Andhra Pradesh and Karnataka |
| 6 | Southern | Kerala and Tamil Nadu |
| 7 | Eastern | West Bengal, Orissa and North Eastern |
| 8 | Eastern | Bihar and Jharkhand |
| 9 | APS | Army Postal Service |
