| Districts | Headquarters | Pin Code range startingfrom |
| Coimbatore | Coimbatore | 641001 |
| Cuddalore | Cuddalore | 607001 |
| Dharmapuri | Dharmapuri | 636701 |
| Dindigul | Dindigul | 624001 |
| Erode | Erode | 638001 |
| Kancheepuram | Kancheepuram | 631501 |
| Kanniyakumari | Nagercoil | 629702 |
| Karur | Karur | 639001 |
| Krishnagiri | Krishnagiri | 635001 |
| Madurai | Madurai | 625001 |
| Nagappattinam | Nagappattinam | 611001 |
| Namakkal | Namakkal | 631001 |
| Nilagiri | Udhagamandalam | not available |
| Perambalur | Perambalur | 621212 |
| Pudukkottai | Pudukkottai | not available |
| Ramanathapuram | Ramanathapuram | 623501 |
| Salem | Salem | 636001 |
| Sivagangai | Sivagangai | 630561 |
| Thanjavur | Thanjavur | 613001 |
| Theni | Theni | 625531 |
| Thiruvallur | Thiruvallur | 602001 |
| Thoothukudi | Thoothukudi | not available |
| Tiruchirapalli | Tiruchirapalli | 620001 |
| Tirunelveli | Tirunelveli | 627001 |
| Tiruvannamalai | Tiruvannamalai | 606601 |
| Vellore | Vellore | 632001 |
| Villupuram | Villupuram | 605602 |
| Virudhunagar | Virudhunagar | 626001 |
Apart from these pin codes, other important pin codes of Tamil Nadu are- the capital Chennai with pin codes from 600001, Tirupur with pin codes starting from 641601, Cunoor having pin codes from 643101 and Sivakasi with 626123.
Last Updated on 1/17/2011