There are 3 post offices under PIN code 600123.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Malayambakkam B.O | Branch Office | Delivery | Poonamallee | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Nazarethpettai S.O | Sub Office | Delivery | Poonamallee | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Sembarambakkam B.O | Branch Office | Delivery | Poonamallee | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |