In Nigeria’s Rivers State, there are twenty-three Local Government Areas (LGAs), including Andoni. Its main office is in the town of Ngo.
Every location in the LGA uses the same zip or postal code.
The postcode for Andoni’s areas is as follows:
| Location | Postcode |
| Okwaniok | 503102 |
| Oloma | 503102 |
| Otak | 503102 |
| Otiga | 503102 |
| Otuafik | 503102 |
| Otudon | 503102 |
| Otugan | 503102 |
| Oyookoto | 503102 |
| Samanga | 503102 |
| Uyeada | 503102 |
| Uyengala | 503102 |
| Weret | 503102 |
| Okukpoi | 503102 |
| Anyama-Aganna | 503102 |
| Echitcham | 503102 |
| Iwo | 503102 |
| Anyamaboko | 503102 |
| Egbomu | 503102 |
| Iwoogone | 503102 |
| Asakokola | 503102 |
| Egbormu | 503102 |
| Kapamant | 503102 |
| Asakokolo | 503102 |
| Egwede | 503102 |
| Kwake | 503102 |
| Asarama | 503102 |
| Ekede | 503102 |
| Mertege | 503102 |
| Asuk-Ama | 503102 |
| Friday | 503102 |
| Muma | 503102 |
| Asuk-Oyet | 503102 |
| Glilea | 503102 |
| Nchiama | 503102 |
| Asurubaa | 503102 |
| Ibotobom | 503102 |
| Ngo | 503102 |
| Ataba | 503102 |
| Ibotokpon | 503102 |
| Obiama | 503102 |
| Aturube | 503102 |
| Ichama | 503102 |
| Obot-Usut | 503102 |
| Ayama | 503102 |
| Igbanga | 503102 |
| Obukolum | 503102 |
| Darile | 503102 |
| Ikuru | 503102 |
| Ogbidim | 503102 |
| Dema | 503102 |
| Inyoukpo | 503102 |
| Okokiri | 503102 |
| Amaoke | 503102 |
| Dimama | 503102 |
| Isidum | 503102 |
| Okoro Iro | 503102 |
| Amatamuno | 503102 |
| Ebon-Okolo | 503102 |
| Isioke | 503102 |
| Okorolo | 503102 |
| Anyama | 503102 |
| Ebuguma | 503102 |
| Isiokwan | 503102 |
| Aam-Ekut | 503102 |
| Aama-Runner | 503102 |
| Afradiki | 503102 |
| Aganna | 503102 |
| Aganofor | 503102 |
| Agbachichama | 503102 |
| Agbadama | 503102 |
| Agbadem | 503102 |
| Agbakoroma | 503102 |
| Agwut Obolo | 503102 |
| Ama Sunday | 503102 |
| Amanku | 503102 |
| Amansa | 503102 |