There are 12 post offices under PIN code 603109.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ammanambakkam B.O | Branch Office | Delivery | Tirukalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Desumugipettai B.O | Branch Office | Non-Delivery | Na | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Edaiyur B.O | Branch Office | Delivery | Tirukalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 4 | Irumbulichery B.O | Branch Office | Delivery | Tirukalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 5 | Mullikolathur B.O | Branch Office | Delivery | Tirulkalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 6 | Oragadam B.O | Branch Office | Delivery | Chengalpattu | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 7 | Pandur B.O | Branch Office | Delivery | Tirukalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 8 | Puliyur B.O | Branch Office | Delivery | Tirukalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 9 | Thathalur B.O | Branch Office | Delivery | Tirukalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 10 | Tirukalikundram Bazaar S.O | Sub Office | Non-Delivery | Tirukalukundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 11 | Tirukalikundram S.O | Sub Office | Delivery | Tirukalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 12 | Veerapuram B.O | Branch Office | Delivery | Tirukalikundram | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |