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
