PIN code 604503 belongs to Melmattaivinnamangalam BO (Branch Post Office), located in Tiruvannamalai district, Tamil Nadu. It falls under the Southern Postal Region and is served by 8 post offices in total.
| Post office | Type | Full name |
|---|---|---|
| Melmattaivinnamangalam BO | BO | Branch Post Office |
| Alliyandal BO | BO | Branch Post Office |
| Mosavadi BO | BO | Branch Post Office |
| Navalpakkam BO | BO | Branch Post Office |
| Ragunathasamudram BO | BO | Branch Post Office |
| Injimedu BO | BO | Branch Post Office |
| Kaduganur BO | BO | Branch Post Office |
| Pernamallur SO | SO | Sub Post Office |
