In Mayiladuthurai district, Tamil Nadu, PIN code 609113 is anchored by Koolaiyar B.O, a Branch Post Office. Mail addressed to this code is sorted through the Southern Postal Region, across 2 listed offices.
| Post office | Type | Full name |
|---|---|---|
| Koolaiyar B.O | BO | Branch Post Office |
| Tirumullaivasal S.O | SO | Sub Post Office |
