PinCode: 841232, Sadarpur Post Office, Siwan, Siwan, Bihar
| Post Office | Sadarpur |
| Post Office Status | Branch Post Office (Delivery) |
| PinCode | 841232
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| Telephone | |
| Town/Taluk | Siwan |
| District | Siwan |
| State | Bihar |
| Postal Division | Siwan |
| Postal Region | Muzaffarpur |
| Postal Circle | Bihar |
List of Other Post Offices in Siwan, Siwan, Bihar