600057 PIN Code
| Office | Type | Delivery | District | State |
|---|---|---|---|---|
| Ennore Thermal Station SO | PO | Delivery | Chennai | Tamil Nadu |
| Ernavur SO | PO | Non Delivery | Thiruvallur | Tamil Nadu |
| Kamarajnagar BO | BO | Non Delivery | Thiruvallur | Tamil Nadu |
Source: RBI / India Post source upload · verified 04 Jul 2026