PIN code 600057 belongs to Kamarajnagar BO (Branch Post Office), located in Thiruvallur district, Tamil Nadu. It falls under the Southern Postal Region and is served by 3 post offices in total.
| Post office | Type | Full name |
|---|---|---|
| Kamarajnagar BO | BO | Branch Post Office |
| Ernavur SO | SO | Sub Post Office |
| Ennore Thermal Station SO | SO | Sub Post Office |
