| Place | Postal Code |
|---|---|
| Akpa 1, Oso-Akwa | 453116 |
| Akpa 11, Oso-Akwa | 453116 |
| Akpa 1V, Oso-Akwa | 453116 |
| Amaiyi, Oso-Akwa | 453116 |
| Amankwu 1, Oso-Akwa | 453116 |
| Amankwu 11, Oso-Akwa | 453116 |
| Amaugha, Oso-Akwa | 453116 |
| Okpalaukwu, Oso-Akwa | 453116 |
| Umuaja, Oso-Akwa | 453116 |
| Umuokerete, Oso-Akwa | 453116 |