PinCode: 802160, Koilwar Post Office, Arrah, Bhojpur, Bihar
| Post Office | Koilwar |
| Post Office Status | Sub Post Office (Delivery) |
| PinCode | 802160
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| Telephone | 06182-282207 |
| Town/Taluk | Arrah |
| District | Bhojpur |
| State | Bihar |
| Postal Division | Bhojpur |
| Postal Region | Patna HQ |
| Postal Circle | Bihar |
List of Other Post Offices in Arrah, Bhojpur, Bihar