List of Sub Districts in Thiruvallur
| ID | States/UTs | Districts | SubDistricts |
|---|---|---|---|
| 1 | Tamil Nadu | Thiruvallur | Ponneri |
| 2 | Tamil Nadu | Thiruvallur | Poonamallee |
| 3 | Tamil Nadu | Thiruvallur | Avadi |
| 4 | Tamil Nadu | Thiruvallur | Uthukkottai |
| 5 | Tamil Nadu | Thiruvallur | Thiruvallur |
| 6 | Tamil Nadu | Thiruvallur | Gummidipoondi |
| 7 | Tamil Nadu | Thiruvallur | Tiruttani |
| 8 | Tamil Nadu | Thiruvallur | R K Pet |
| 9 | Tamil Nadu | Thiruvallur | Pallipattu |