Khalwa BO is the primary post office registered under PIN code 841243 in Siwan, Bihar. This code sits within the Eastern Postal Region, with 13 offices operating under it.
| Post office | Type | Full name |
|---|---|---|
| Khalwa BO | BO | Branch Post Office |
| Semaria BO | BO | Branch Post Office |
| Sirisia BO | BO | Branch Post Office |
| Sahpur SO | SO | Sub Post Office |
| Barkamanjha BO | BO | Branch Post Office |
| Kabirpur BO | BO | Branch Post Office |
| Nautan BO | BO | Branch Post Office |
| BPEkdanga BO | BO | Branch Post Office |
| Pachphera BO | BO | Branch Post Office |
| Chainpur Hata BO | BO | Branch Post Office |
| Jagdishpur Kothi BO | BO | Branch Post Office |
| Keelpur BO | BO | Branch Post Office |
| Chhotka Manjha BO | BO | Branch Post Office |
