Admapur BO is the primary post office registered under PIN code 841504 in Siwan, Bihar. This code sits within the Eastern Postal Region, with 8 offices operating under it.
| Post office | Type | Full name |
|---|---|---|
| Admapur BO | BO | Branch Post Office |
| Harnathpur BO | BO | Branch Post Office |
| Ramnagar BO | BO | Branch Post Office |
| Raghunathpur SO Siwan | OTHER | post office |
| Karsar BO | BO | Branch Post Office |
| Narhan BO | BO | Branch Post Office |
| Rajpur BO | BO | Branch Post Office |
| NIKHTI KALA BO | BO | Branch Post Office |
