There are 10 post offices under PIN code 631203.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Egattur B.O | Branch Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Kadambathur S.O | Sub Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Kaivandur B.O | Branch Office | Delivery | Thiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 4 | Pandur B.O | Branch Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 5 | Pattaraiperumbudur B.O | Branch Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 6 | Pudumavilangai B.O | Branch Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 7 | Selai B.O | Branch Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 8 | Senji B.O | Branch Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 9 | Tirupasur B.O | Branch Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |
| 10 | Vidaiyur B.O | Branch Office | Delivery | Tiruvallur | Tiruvallur | Kanchipuram | Chennai Region | Tamil Nadu | Tamilnadu |