There are 6 post offices under PIN code 603401.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Andarkuppam B.O | Branch Office | Delivery | Cheyyur | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Chunampet S.O | Sub Office | Delivery | Cheyyur | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Kadukkalur B.O | Branch Office | Delivery | Cheyyur | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 4 | Puthirankottai B.O | Branch Office | Delivery | Cheyur | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 5 | Vannianallur B.O | Branch Office | Delivery | Madurantakam | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |
| 6 | Velur B.O | Branch Office | Delivery | Na | Kanchipuram | Chengalpattu | Chennai Region | Tamil Nadu | Tamilnadu |