| S.No | Zone Name | District |
|---|---|---|
| 1 | Tamil Nadu_Zone 1 | Kanyakumari,Tirunelveli,Tenkasi,Thoothukudi,Virudhunagar |
| 2 | Tamil Nadu_Zone 2 | Ramanathapuram,Sivaganga,Madurai,Theni,Dindigul |
| 3 | Tamil Nadu_Zone 3 | Coimbatore,Tirupur,Karur,Erode,The Nilgiris |
| 4 | Tamil Nadu_Zone 4 | Krishnagiri,Dharmapuri,Salem,Namakkal,Tiruchirappalli |
| 5 | Tamil Nadu_Zone 5 | Viluppuram,Cuddalore,Kallakaruchi,Chegalpattu |
| 6 | Tamil Nadu_Zone 6 | Tiruvannamalai,Kanchipuram,Chennai |
| 7 | Tamil Nadu_Zone 7 | Tiruvallur,Ranipet,Vellore,Tirupattur |
| 8 | Tamil Nadu_Zone 8 | Pudukkottai,Thanjavur,Tiruvarur,Nagapattinam,Puducherry,Ariyalur,Perambalur |