There are 4 post offices under PIN code 600057.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ennore RS S.O | Sub Office | Non-Delivery | Ambattur | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Ennore Thermal Station S.O | Sub Office | Delivery | Ponneri | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Ernavur S.O | Sub Office | Non-Delivery | Na | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 4 | Kamarajnagar B.O | Branch Office | Non-Delivery | Ponneri | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |