| Place | Post Code |
|---|---|
| Agu Orba, Orba | 412110 |
| Ajuona, Orba | 412110 |
| Amalla, Orba | 412110 |
| Amaoba, Orba | 412110 |
| Oham, Orba | 412110 |
| Ohebe-Orba, Orba | 412110 |
| Owerri Amagu, Orba | 412110 |
| Owerri-Ezeorba, Orba | 412110 |
| Owerri-Okpu, Orba | 412110 |
| Umu-Ugwu, Orba | 412110 |
| Umunkpume, Orba | 412110 |
| All postal codes in Udenu | |
|---|---|
| Amalla, Udenu | |
| Ezimo, Udenu | |
| Imilike, Udenu | |
| Obollo-Afor, Udenu | |
| Obollo-Eke, Udenu | |
| Obollo-Etti, Udenu | |
| Ogbodu-Aba, Udenu | |
| Orba, Udenu | |
| Udunedem, Udenu | |