| Place | Post Code |
|---|---|
| Amaegbu, Ariam Usaka | 440110 |
| Ariam-Alala, Ariam Usaka | 440110 |
| Ariam Eku-Elu, Ariam Usaka | 440110 |
| Azunchai, Ariam Usaka | 440110 |
| Ekpiri-Alala, Ariam Usaka | 440110 |
| Ekpiri - Eludu, Ariam Usaka | 440110 |
| Ekwelu, Ariam Usaka | 440110 |
| Ndieke, Ariam Usaka | 440110 |
| Ndiokoro, Ariam Usaka | 440110 |
| Ndiorie, Ariam Usaka | 440110 |
| Obeagwu, Ariam Usaka | 440110 |
| Obeama, Ariam Usaka | 440110 |
| Oboni I, Ariam Usaka | 440110 |
| Oboni II, Ariam Usaka | 440110 |
| Upa, Ariam Usaka | 440110 |
| Usaka Ukwu, Ariam Usaka | 440110 |