PIN code 683518 – Ernakulam, Kerala

683518 is the PIN code of 2 post offices in Ernakulam district, Kerala, served by the Koonammavu SO sub office.

Post office	Type	Delivery	Division
Koonammavu SOMap	Post office	Yes	Alwaye Division
Kongorpilly BOMap	Branch office	Yes	Alwaye Division

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