The list of districts in Tamil Nadu is given below, this is updated list including recent additions happened few years ago. Along with district list, we have also provided Head Quarters of each districts, Area of the districts, and respective population.
| Sino | District | Head Quarters | Area in Sq. Km | Population |
| 1 | Ariyalur | Ariyalur | 2028 | 754,894 |
| 2 | Chengalpet | Chengalpattu | 2803 | 2,556,244 |
| 3 | Chennai | Chennai | 462 | 4,646,732 |
| 4 | Coimbatore | Coimbatore | 4951 | 3,458,045 |
| 5 | Cuddalore | Cuddalore | 3870 | 2,605,914 |
| 6 | Dharmapuri | Dharmapuri | 4736 | 1,506,843 |
| 7 | Dindigul | Dindigul | 6289 | 2,159,775 |
| 8 | Erode | Erode | 6036 | 2,251,744 |
| 9 | Kallakurichi | Kallakurichi | 3441 | 1,370,281 |
| 10 | Kancheepuram | Kancheepuram | 1800 | 1,166,401 |
| 11 | Karur | Karur | 3022 | 1,064,493 |
| 12 | Krishnagiri | Krishnagiri | 5414 | 1,883,731 |
| 13 | Madurai | Madurai | 3846 | 3,038,252 |
| 14 | Mayiladuthurai | Mayiladuthurai | 1237 | 85,632 |
| 15 | Nagapattinam | Nagapattinam | 1459 | 1,616,450 |
| 16 | Kanyakumari | Nagercoil | 1729 | 1,870,374 |
| 17 | Namakkal | Namakkal | 3573 | 1,726,601 |
| 18 | Perambalur | Perambalur | 1837 | 565,223 |
| 19 | Pudukottai | Pudukkottai | 4848 | 1,618,345 |
| 20 | Ramanathapuram | Ramanathapuram | 4243 | 1,353,445 |
| 21 | Ranipet | Ranipet | 2234 | 1,210,277 |
| 22 | Salem | Salem | 5205 | 3,482,056 |
| 23 | Sivagangai | Sivagangai | 4086 | 1,339,101 |
| 24 | Tenkasi | Tenkasi | 2916 | 1,407,627 |
| 25 | Thanjavur | Thanjavur | 3397 | 2,405,890 |
| 26 | Theni | Theni | 3066 | 1,245,899 |
| 27 | Thiruvallur | Thiruvallur | 3444 | 3,728,104 |
| 28 | Thiruvarur | Thiruvarur | 2161 | 1,264,277 |
| 29 | Tuticorin | Thoothukudi | 4621 | 1,750,176 |
| 30 | Trichirappalli | Tiruchirappalli | 4407 | 2,722,290 |
| 31 | Thirunelveli | Tirunelveli | 3842 | 1,665,253 |
| 32 | Tirupathur | Tirupathur | 1793 | 1,111,812 |
| 33 | Tiruppur | Tiruppur | 5186 | 2,479,052 |
| 34 | Tiruvannamalai | Tiruvannamalai | 6191 | 2,464,875 |
| 35 | The Nilgiris | Udagamandalam (Ooty) | 2453 | 735,394 |
| 36 | Vellore | Vellore | 2222 | 1,614,242 |
| 37 | Viluppuram | Viluppuram | 3726 | 2,093,003 |
| 38 | Virudhunagar | Virudhunagar | 4288 | 1,942,288 |
- Population data based on the census data for the year 2011