There are 13 post offices under PIN code 631003.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Anaipakkam B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 2 | Chitteri B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 3 | Ichiputhur B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 4 | Jothinagar S.O | Sub Office | Delivery | Arakonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 5 | Kainoor B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 6 | Kilandur B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 7 | Kilpakkam B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 8 | Kumpinipet B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 9 | Mudur B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 10 | Perungalathur B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 11 | Thanigaipolur B.O | Branch Office | Delivery | Arakonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 12 | Vadamambakkam B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |
| 13 | Valaikulam B.O | Branch Office | Delivery | Arakkonam | Vellore | Arakkonam | Chennai Region | Tamil Nadu | Tamilnadu |