There are 6 post offices under PIN code 600055.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Avadi IAF S.O | Sub Office | Delivery | Ambattur | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Koduvalli B.O | Branch Office | Delivery | Poonamallee | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Mittanamalli B.O | Branch Office | Non-Delivery | Poonamallee | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 4 | Morai B.O | Branch Office | Delivery | Poonamallee | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 5 | Palavedu B.O | Branch Office | Delivery | Poonamallee | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |
| 6 | Pandeeswaram B.O | Branch Office | Delivery | Poonamallee | Tiruvallur | Tambaram | Chennai Region | Tamil Nadu | Tamilnadu |