| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Ibiaku Ata, Ibiaku | 531105 |
| Postal/ZIP Codes in Ibiaku Ikot-Ukana, Ibiaku | 531105 |
| Postal/ZIP Codes in Ibiaku Okpo, Ibiaku | 531105 |
| Postal/ZIP Codes in Mbiabong Ikon-Ekpene-Oton, Ibiaku | 531105 |
| Postal/ZIP Codes in Ndiya Mfia, Ibiaku | 531105 |