Pin code System In India

First Digit—Region— States Covered 

1 —  Northern -  Delhi,   Haryana,   Punjab,   Himachal Pradesh   and   Jammu & Kashmir 
2 —  Northern -  Uttar Pradesh   and   Uttaranchal 
3 —  Western -  Rajasthan   and    Gujarat 
4 —  Western -  Maharashtra,   Madhya Pradesh   and   Chattisgarh 
5 —  Southern -  Andhra Pradesh   and   Karnataka 
6 —  Southern -  Kerala   and   Tamil Nadu 
7 —  Eastern -  West Bengal,   Orissa   and   North Eastern
8 — Eastern -  Bihar  and   Jharkand
9 — APS -  Army Postal Service