Karingannur SO is the primary post office registered under PIN code 691516 in Kollam, Kerala. This code sits within the Southern Postal Region, with 3 offices operating under it.
| Post office | Type | Full name |
|---|---|---|
| Karingannur SO | SO | Sub Post Office |
| Akkal BO | BO | Branch Post Office |
| Cheriyavelinallur BO | BO | Branch Post Office |
