In Tiruvannamalai district, Tamil Nadu, PIN code 604601 is anchored by Erumpoondi BO, a Branch Post Office. Mail addressed to this code is sorted through the Southern Postal Region, across 7 listed offices.
| Post office | Type | Full name |
|---|---|---|
| Erumpoondi BO | BO | Branch Post Office |
| Rayampettai BO | BO | Branch Post Office |
| Valudalangunam BO | BO | Branch Post Office |
| Kikkalur BO | BO | Branch Post Office |
| Sirunathur BO | BO | Branch Post Office |
| Kilpennathur SO | SO | Sub Post Office |
| Mekkalur BO | BO | Branch Post Office |
