| Place | Post Code |
|---|---|
| Akpa Nkanua, Effiat | 523114 |
| Akwa Obio Effiat, Effiat | 523114 |
| Asiok Obufa, Effiat | 523114 |
| Esuk Anwang, Effiat | 523114 |
| Ibuot Utan, Effiat | 523114 |
| Ine Inua Abasi, Effiat | 523114 |
| Inua Abasi, Effiat | 523114 |
| James Town, Effiat | 523114 |
| Mbe Ndoro, Effiat | 523114 |
| Obio Iyata, Effiat | 523114 |
| Obong Nim, Effiat | 523114 |
| Usuk Effiat, Effiat | 523114 |
| Utan Antai, Effiat | 523114 |
| Utan Brama, Effiat | 523114 |
| Utan Udombo, Effiat | 523114 |
| Utang Efiong, Effiat | 523114 |
| All postal codes in Mbo | |
|---|---|
| Afaha Okpo, Mbo | |
| Effiat, Mbo | |
| Ibiaku, Mbo | |
| Ikpa Ibom, Mbo | |
| Ikpo Ikono, Mbo | |
| Ukwong, Mbo | |