In Chengalpattu district, Tamil Nadu, PIN code 603203 is anchored by Ninnakarai BO, a Branch Post Office. Mail addressed to this code is sorted through the Southern Postal Region, across 3 listed offices.
| Post office | Type | Full name |
|---|---|---|
| Ninnakarai BO | BO | Branch Post Office |
| Kavanur BO | BO | Branch Post Office |
| Kattankolathur SO | SO | Sub Post Office |
