There are 4 post offices under PIN code 601101.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Arni CPT S.O | Sub Office | Delivery | Ponneri | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Panayancheri B.O | Branch Office | Delivery | Ponneri | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Pondavakkam B.O | Branch Office | Delivery | Ponneri | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 4 | Rallapadi B.O | Branch Office | Delivery | Ponneri | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |