There are 13 post offices under PIN code 631209.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Agooru B.O | Branch Office | Delivery | Tiruttani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Murukkambattu B.O | Branch Office | Delivery | Tirutani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Netterikandigai B.O | Branch Office | Delivery | Na | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 4 | Pattabiramapuram B.O | Branch Office | Delivery | Tiruttani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 5 | Srinivasapuram B.O | Branch Office | Delivery | Na | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 6 | Suryanagaram B.O | Branch Office | Delivery | Tirutani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 7 | Tirutani Hills B.O | Branch Office | Non-Delivery | Tiruttani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 8 | Tiruttani S.O | Sub Office | Delivery | Tiruttani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 9 | Tiruttanieast S.O | Sub Office | Non-Delivery | Tiruttani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 10 | Tiruttanisouth S.O | Sub Office | Non-Delivery | Tiruttani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 11 | Tiruttaniwest S.O | Sub Office | Non-Delivery | Tiruttani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 12 | Upper Tirutani B.O | Branch Office | Non-Delivery | Tiruttani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 13 | Velanjeri B.O | Branch Office | Delivery | Tirutani | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |