In Sirmaur district, Himachal Pradesh, PIN code 173021 is anchored by Kotribyas BO, a Branch Post Office. Mail addressed to this code is sorted through the Northern Postal Region, across 4 listed offices.
| Post office | Type | Full name |
|---|---|---|
| Kotribyas BO | BO | Branch Post Office |
| Sainwala Mubarakpur BO | BO | Branch Post Office |
| Misserwala BO | BO | Branch Post Office |
| Majra SO Sirmaur | OTHER | post office |
