Mahuwal Mahal SO is the primary post office registered under PIN code 841240 in Siwan, Bihar. This code sits within the Eastern Postal Region, with 4 offices operating under it.
| Post office | Type | Full name |
|---|---|---|
| Mahuwal Mahal SO | SO | Sub Post Office |
| Chandparsa BO | BO | Branch Post Office |
| Merhi BO | BO | Branch Post Office |
| Tarwaparsa BO | BO | Branch Post Office |
