Arunthodu BO is the primary post office registered under PIN code 604501 in Tiruvannamalai, Tamil Nadu. This code sits within the Southern Postal Region, with 12 offices operating under it.
| Post office | Type | Full name |
|---|---|---|
| Arunthodu BO | BO | Branch Post Office |
| Mahamayee Tirumani BO | BO | Branch Post Office |
| Thennathur BO | BO | Branch Post Office |
| Chitragavur Pudur BO | BO | Branch Post Office |
| Vayalur BO | BO | Branch Post Office |
| Desur SO | SO | Sub Post Office |
| Kunnakampoondi BO | BO | Branch Post Office |
| Thenthinnalur BO | BO | Branch Post Office |
| Vedal BO | BO | Branch Post Office |
| Kilputhur BO | BO | Branch Post Office |
| Kilnamandi BO | BO | Branch Post Office |
| Sattapundi BO | BO | Branch Post Office |
