| Post office | Koilwar S.O |
| Pin code | 802160 |
| Office type | S.O |
| Taluk / city | Arrah |
| District name | Bhojpur |
| State name | Bihar |
| Delivery status | Delivery |
| Division name | Bhojpur |
| Region name | Patna HQ |
| Circle name | Bihar |
| Related sub office | NA |
| Related head office | Arrah H.O |
| Pincode | Post office name | City | District | State |
|---|---|---|---|---|
| 802160 | Dhandihan B.O | Arrah | Bhojpur | Bihar |
| 802160 | Koilwar S.O | Arrah | Bhojpur | Bihar |
| 802160 | Kulharia B.O | Arrah | Bhojpur | Bihar |
| 802160 | Sakaddi B.O | Arrah | Bhojpur | Bihar |
| 802160 | Katkaira B.O | Koilwar | Bhojpur | Bihar |
| 802160 | Pareo B.O | Koilwar | Bhojpur | Bihar |