| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Amauzu, Okpu-Umuobo | 453112 |
| Postal/ZIP Codes in Mgboko-Umuete, Okpu-Umuobo | 453112 |
| Postal/ZIP Codes in Umuaba, Okpu-Umuobo | 453112 |
| Postal/ZIP Codes in Umuaga, Okpu-Umuobo | 453112 |
| Postal/ZIP Codes in Umuara, Okpu-Umuobo | 453112 |
| Postal/ZIP Codes in Umuobo, Okpu-Umuobo | 453112 |
| Postal/ZIP Codes in Uratta/Amaekpu, Okpu-Umuobo | 453112 |