| Office Name | Harnatar B.O |
| Pincodes | 841235 |
| Area | Harnatar |
| Office Status | Branch Post Office |
| Postal Circle | Bihar |
| Postal Division | Siwan |
| Postal Region | Muzaffarpur |
| District | Siwan |
| State | Bihar |
| Telephone No. | Na |
| Office Name | Harnatar B.O |
| Pincodes | 845105 |
| Area | Harnatar |
| Office Status | Branch Post Office |
| Postal Circle | Bihar |
| Postal Division | West Champaran |
| Postal Region | Muzaffarpur |
| District | West Champaran |
| State | Bihar |
| Telephone No. | Na |