Srikalpur BO is the primary post office registered under PIN code 841435 in Siwan, Bihar. This code sits within the Eastern Postal Region, with 9 offices operating under it.
| Post office | Type | Full name |
|---|---|---|
| Srikalpur BO | BO | Branch Post Office |
| Tarwa Parsia BO | BO | Branch Post Office |
| Chakari BO | BO | Branch Post Office |
| Dumrahar BO | BO | Branch Post Office |
| Guthni SO | SO | Sub Post Office |
| Balua BO | BO | Branch Post Office |
| Tenua BO | BO | Branch Post Office |
| Bhlua BO | BO | Branch Post Office |
| Chitakhal BO | BO | Branch Post Office |
