In Pathanamthitta district, Kerala, PIN code 689531 is anchored by Koipuram SO, a Sub Post Office. Mail addressed to this code is sorted through the Southern Postal Region, across 2 listed offices.
| Post office | Type | Full name |
|---|---|---|
| Koipuram SO | SO | Sub Post Office |
| Poovathoor BO | BO | Branch Post Office |
