| Office Name | Harnathpur B.O |
| Pincodes | 841504 |
| Area | Harnathpur |
| Office Status | Branch Post Office |
| Postal Circle | Bihar |
| Postal Division | Siwan |
| Postal Region | Muzaffarpur |
| District | Siwan |
| State | Bihar |
| Telephone No. | Na |
| Office Name | Harnathpur B.O |
| Pincodes | 812006 |
| Area | Harnathpur |
| Office Status | Branch Post Office |
| Postal Circle | Bihar |
| Postal Division | Bhagalpur |
| Postal Region | Patna Hq |
| District | Bhagalpur |
| State | Bihar |
| Telephone No. | Na |
| Office Name | Harnathpur B.O |
| Pincodes | 821109 |
| Area | Harnathpur |
| Office Status | Branch Post Office |
| Postal Circle | Bihar |
| Postal Division | Rohtas |
| Postal Region | Patna Hq |
| District | Kaimur Bhabua |
| State | Bihar |
| Telephone No. | Na |
| Office Name | Harnathpur B.O |
| Pincodes | 312203 |
| Area | Harnathpur |
| Office Status | Branch Post Office |
| Postal Circle | Rajasthan |
| Postal Division | Chittorgarh |
| Postal Region | Ajmer |
| District | Chittorgarh |
| State | Rajasthan |
| Telephone No. | Na |