PIN code 603103 – Chengalpattu, Tamil Nadu

603103 is the PIN code of 3 post offices in Chengalpattu district, Tamil Nadu, served by the Kelambakkam SO sub office.

Post office	Type	Delivery	Division
Kelambakkam SOMap	Post office	Yes	Tambaram Division
Padur SOMap	Post office	No	Tambaram Division
Pudupakkam BOMap	Branch office	Yes	Tambaram Division

Source: India Post PIN code directory (Open Government Data). Branch offices usually get mail through their sub or head office.