| Office Name | Karja B.O |
| Pincodes | 843106 |
| Area | Karja |
| Office Status | Branch Post Office |
| Postal Circle | Bihar |
| Postal Division | Muzaffarpur |
| Postal Region | Muzaffarpur |
| District | Muzaffarpur |
| State | Bihar |
| Telephone No. | Na |
| Office Name | Karja S.O |
| Pincodes | 843143 |
| Area | Karja |
| Office Status | Sub Post Office |
| Postal Circle | Bihar |
| Postal Division | Muzaffarpur |
| Postal Region | Muzaffarpur |
| District | Muzaffarpur |
| State | Bihar |
| Telephone No. | 0621-111111 |