Postal - PIN CODES of Tamil Nadu Districts

The Postal Index Number Code System, known as the PIN Code system was introduced in India on the 15th of August, 1972.
The objective of PIN Code is to simplify the sorting of mails, thus speed up their transmission and delivery.

PIN Code avoids the confusion which results out of duplication of names of various places.
Correct delivery of mails is possible if the PIN Code is written, even when the address may be written in any language.

How does it work?

Each PIN Code has six digits.
First digit indicates the zone in which the Post Office is located.
Second & Third digits indicate the sub-zone and sorting district.
Fourth digit indicates the route on which the sorting office is located.
Fifth & Sixth digits indicate the number assigned to the delivery Post Office.

Zonal Index

Index No. (First Digit of PIN Code)


Area Covered
1 Delhi, Haryana, Punjab, Chandigarh, Himachal Pradesh, Jammu & Kashmir
2 Uttar Pradesh, Uttaranchal
3 Rajasthan, Gujarat, Daman & Diu, Dadra & Nagar Haveli
4 Maharashtra, Goa, Madhya Pradesh, Chhattisgarh
5 Andhra Pradesh, Karnataka
6 Tamilnadu, Kerala, Lakshadweep, Minicoy & Admindivi Islands, Pondicherry
7 Orissa, West Bengal, Assam, Arunachal Pradesh, Mizoram, Meghalaya, Nagaland, Tripura, Sikkim, Andaman & Nicobar Islands
8 Bihar, Jharkand


Sorting District Index

Index No. (First Three Digits of PIN Code) District Covered
600 Chennai
601,602 Tiruvallur
603,631 Kanchipuram
605,606 Villupuram (including Pondicherry)
606 Tiruvannamalai
607,608 Cuddalore
609,610 Tiruvarur (including Karaikal)
611 Nagapattinam
612,613,614 Thanjavur
620,621 Tiruchirapalli
621 Perambalur
621 Ariyalur
622 Pudukkottai
623 Ramanathapuram
624 Dindigul
625 Madurai
625 Theni
626 Virudhunagar
627 Tirunelveli
628 Tuticorin
629 Nagercoil
630 Sivaganga
632 Vellore
635,636 Dharmapuri
636 Salem
637 Namakkal
638 Erode
639 Karur
641,642 Coimbatore
643 Nilgiris