| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Eziama, Onicha | 462123 |
| Postal/ZIP Codes in Omukwu, Onicha | 462123 |
| Postal/ZIP Codes in Ubolukam, Onicha | 462123 |
| Postal/ZIP Codes in Umuagbala, Onicha | 462123 |
| Postal/ZIP Codes in Umuekekwene, Onicha | 462123 |
| Postal/ZIP Codes in Umueleagwua, Onicha | 462123 |
| Postal/ZIP Codes in Umuevu, Onicha | 462123 |
| Postal/ZIP Codes in Umuhu, Onicha | 462123 |
| Postal/ZIP Codes in Umuoma, Onicha | 462123 |