| District-wise Number of Sub-Districts in Tamil Nadu (2001 Census) | |
| District | Sub Districts |
| Thiruvallur | |
| Kancheepuram | |
| Vellore | |
| Dharmapuri | |
| Tiruvannamalai | |
| Viluppuram | |
| Salem | |
| Namakkal | |
| Erode | |
| The Nilgiris | |
| Coimbatore | |
| Dindigul | |
| Karur | |
| Tiruchirappalli | |
| Perambalur | |
| Ariyalur | |
| Cuddalore | |
| Nagapattinam | |
| Thiruvarur | |
| Thanjavur | |
| Pudukkottai | |
| Sivaganga | |
| Madurai | |
| Theni | |
| Virudhunagar | |
| Ramanathapuram | |
| Thoothukkudi | |
| Tirunelveli | |
| Kanniyakumari | |
| Tamil Nadu | |
