| Place | Postal Code |
|---|---|
| Agba, Isu | 491106 |
| Agbabor, Isu | 491106 |
| Agueke, Isu | 491106 |
| Amannator, Isu | 491106 |
| Isu-Achara, Isu | 491106 |
| Mbala Ukwu, Isu | 491106 |
| Mgbelaeze, Isu | 491106 |
| Obeagu, Isu | 491106 |
| Ojiegbe, Isu | 491106 |
| Umunika, Isu | 491106 |
| Postal Codes in Onicha | |
|---|---|
| Abaomege, Onicha | |
| Isu, Onicha | |
| Onicha, Onicha | |
| Shiri, Onicha | |
| Ukawu, Onicha | |