| Place | Post Code |
|---|---|
| Mbiabo, Iboku | 541106 |
| Mbiabo Ikoneto, Iboku | 541106 |
| Mbombori, Iboku | 541106 |
| Ndom Itu, Iboku | 541106 |
| Ndom Nyam, Iboku | 541106 |
| Nkitto/Obot Okpo, Iboku | 541106 |
| Nsa, Iboku | 541106 |
| Nta Ikot Offiong Ede, Iboku | 541106 |
| Nta Obo, Iboku | 541106 |
| Nyom Idibi, Iboku | 541106 |
| Obot Akpang, Iboku | 541106 |
| Obot Etubom, Iboku | 541106 |
| Obot Eyho, Iboku | 541106 |
| Obot Eyo, Iboku | 541106 |
| Obot Idim Nyoyok, Iboku | 541106 |
| Obot Inyang, Iboku | 541106 |
| Obot Iyang, Iboku | 541106 |
| Obot Oko, Iboku | 541106 |
| Obot Udo, Iboku | 541106 |
| Obot Urua, Iboku | 541106 |
| Obot Urua Mbiabo, Iboku | 541106 |
| Obufa Obio Ukem, Iboku | 541106 |
| Ofong Okurusa, Iboku | 541106 |
| OKOY-, Iboku | 541106 |
| Okpo Ikpa, Iboku | 541106 |
| Okuruikang, Iboku | 541106 |