| Office Name | Arni Fort S.O |
| Pincodes | 632301 |
| Area | Arni Fort |
| Office Status | Sub Post Office |
| Postal Circle | Tamilnadu |
| Postal Division | Tiruvannamalai |
| Postal Region | Chennai Region |
| District | Tiruvannamalai |
| State | Tamil Nadu |
| Telephone No. | 04175-253067 |
| Office Name | Arni H.O |
| Pincodes | 632301 |
| Area | Arni |
| Office Status | Branch Post Office |
| Postal Circle | Tamilnadu |
| Postal Division | Tiruvannamalai |
| Postal Region | Chennai Region |
| District | Tiruvannamalai |
| State | Tamil Nadu |
| Telephone No. | 04173-226909 |
| Office Name | Arunagirichatram S.O |
| Pincodes | 632301 |
| Area | Arunagirichatram |
| Office Status | Sub Post Office |
| Postal Circle | Tamilnadu |
| Postal Division | Tiruvannamalai |
| Postal Region | Chennai Region |
| District | Tiruvannamalai |
| State | Tamil Nadu |
| Telephone No. | 04175-253067 |
| Office Name | Saidapettai Arni S.O |
| Pincodes | 632301 |
| Area | Saidapettai Arni |
| Office Status | Sub Post Office |
| Postal Circle | Tamilnadu |
| Postal Division | Tiruvannamalai |
| Postal Region | Chennai Region |
| District | Tiruvannamalai |
| State | Tamil Nadu |
| Telephone No. | 04175-253067 |