Abua–Odual Local Government Area in Rivers State uses postal codes is 510102.
Here are the postal codes for the towns and districts in Abua–Odual:
| Place/Area | Postal code |
| Ekunuga | 510102 |
| Lower Orashi River | 510102 |
| Opu-Ogbogbo | 510102 |
| Elok | 510102 |
| Obaranyi | 510102 |
| Oruama | 510102 |
| Emago | 510102 |
| Odaga | 510102 |
| Otabha | 510102 |
| Emeh | 510102 |
| Odedum | 510102 |
| Otari | 510102 |
| Emekesue | 510102 |
| Ogbema | 510102 |
| Owerewere | 510102 |
| Emelego | 510102 |
| Ogbema Koku | 510102 |
| Plantains | 510102 |
| Emesu | 510102 |
| Ogbokuma | 510102 |
| Serebia | 510102 |
| Emilaghan | 510102 |
| Ogbologbo Plantain | 510102 |
| Emirikpoko | 510102 |
| Ogboloma | 510102 |
| Emon-Ema Emabu | 510102 |
| Oghora | 510102 |
| Engeni | 510102 |
| Okana | 510102 |
| Esala | 510102 |
| Okoboh | 510102 |
| Esidia-Ogbema | 510102 |
| Okomade | 510102 |
| Egbolom | 510102 |
| Forest-Reserve | 510102 |
| Okpedem | 510102 |
| Egbom | 510102 |
| Iyak | 510102 |
| Omokwa | 510102 |
| Egunughan | 510102 |
| Kola-Ogbogbo | 510102 |
| Opikiri | 510102 |
| Abada | 510102 |
| Abual | 510102 |
| Agada | 510102 |
| Akani | 510102 |
| Amalem | 510102 |
| Amaraka | 510102 |
| Amorota | 510102 |
| Aniningboko | 510102 |
| Anyu | 510102 |
| Arukwo | 510102 |
| Dibiriga | 510102 |
| Efebiri | 510102 |
| Egboama | 510102 |