Important Contacts
Collectorate
| Department in Collectorate | Contact Number |
| District Collector | 044-27661600 |
| District Revenue Officer | 044-27662222 |
| Addl. Collector / PD (DRDA) | 044-27662501 |
| PA (General) | 044-27661200 |
| PA (Election) | 044-27667272 |
| SDC (SSS) | 044-27666833 |
| District Supply Officer | 044-27662400 |
| PRO | 044-27662865 |
| District Tourism Officer | 044-27666077 |
| Differently Abled Welfare Office | 044-27662985 |
| Avadi Tahsildar | 044-26554312 |
| Assistant Director (TP) | 044-27665953 |
| Assistant Treasury Officer, Avadi | 044-26553203 |
| Dy. Manager (TAHDCO) | 044-27665539 |
| District Social Welfare Officer | 044-27663912 |
Government Office
| Revenue Divisional Office Tiruvallur Division | 044-27660248 |
| District Registrar | 044-27222674 |
| Superintendent of Police | 044-27666555 |
| PO (ICDS) | 044-27660421 |
| Divisional Engineer, Tiruvallur (Highways) | 044-27661605 |
| Assistant Divisional Engineer, Tiruvallur (HD) | 044-27664760 |
| Joint Director (Health) | 044-27622260 |
| Dy. Director (Health), Tiruvallur (Health) | 044-27666273 |
| Dy. Director (Health), Poonamallee (Health) | 044-26272062 |
| District Forest Officer | 044-24831135 |
| Wildlife Warden (Forest) | 044-24321471 |
| District Employment Officer | 044-27660250 |
| Chief Education Officer | 044-27662599 |
| District Education Officer, Tiruvallur | 7373002993 |
| District Elemantary Education Officer, Tiruvallur | 044-27972602 |
| Taluk Supply Officer, Tiruvallur (Civil Supply) | 044-27662400 |
| District Supply Officer (Civil Supply) | 044-27662400 |
| Joint Director (Agriculture) | 044-27662853 |
| Regional Joint Director (Animal husbandry) | 044-27665287 |