In Kollam district, Kerala, PIN code 691001 is anchored by Kollam Bazar SO, a Sub Post Office. Mail addressed to this code is sorted through the Southern Postal Region, across 4 listed offices.
| Post office | Type | Full name |
|---|---|---|
| Kollam Bazar SO | SO | Sub Post Office |
| Kollam HO | HO | Head Post Office |
| Kollam Taluk Cutchery SO | SO | Sub Post Office |
| Kollam Cantonment SO | SO | Sub Post Office |
