| Place | Post Code |
|---|---|
| Agolo, Ugwuoba | 401146 |
| Aguabosi, Ugwuoba | 401146 |
| Agungwu, Ugwuoba | 401146 |
| Agunwu-Ogboo, Ugwuoba | 401146 |
| Efulu, Ugwuoba | 401146 |
| Egbeagu, Ugwuoba | 401146 |
| Ezi-Achi, Ugwuoba | 401146 |
| Nkpagu, Ugwuoba | 401146 |
| Obiagu, Ugwuoba | 401146 |
| Ogbudu, Ugwuoba | 401146 |
| Okpudu, Ugwuoba | 401146 |
| Okwe, Ugwuoba | 401146 |
| Uide, Ugwuoba | 401146 |
| Umalu, Ugwuoba | 401146 |
| Umualu, Ugwuoba | 401146 |
| Umuomu, Ugwuoba | 401146 |
| Updata, Ugwuoba | 401146 |
| All postal codes in Oji River | |
|---|---|
| Achi, Oji River | |
| Akpugeze, Oji River | |
| Awlaw, Oji River | |
| Inyi, Oji River | |
| Ojo River, Oji River | |
| Ugwuoba, Oji River | |