Onna Local Government Area (LGA) in Akwa Ibom State, Nigeria, has postal codes ranging from 524106 to 523119. Below is a list of postal codes for different towns and districts in Onna.
| Abak Ishiet | 524107 |
| Afaha Atai | 524107 |
| Afaha Ikot Ankang | 524107 |
| Afaha Ikot Idem Udo | 524107 |
| Afaha Ikot- | 524107 |
| Afaha Ubium | 524107 |
| Akpabom | 524106 |
| Akpan-Nkpe | 524107 |
| Atiamkpat Nung- | 524107 |
| Awa | 524107 |
| Awa Nkp | 524107 |
| Awandon | 524107 |
| Edem Idim | 524107 |
| Eyo – Essi | 523119 |
| Eyo – Esu | 523119 |
| Eyo – Usotai | 523119 |
| Eyo – Utumong | 523119 |
| Ikot Abasi | 524106 |
| Ikot Akpan | 524107 |
| Ikot Akpatek | 524106 |
| Ikot Annang | 524106 |
| Ikot Ebekpo | 524106 |
| Ikot Ebidang | 524106 |
| Ikot Ebire | 524106 |
| Ikot Edor | 524106 |
| Ikot Ese Ishiet | 524107 |
| Ikot Ikom Ibom | 524106 |
| Ikot Ndua Iman | 524106 |
| Ikot Ndudot | 524106 |
| Ikot Nkan | 524106 |
| Ikot Nuten | 524106 |
| Ikot Obio-Eket | 524107 |
| Ikot Obong-Ishiet | 524107 |
| Ikot Udo | 524106 |
| Ikwe | 524106 |
| Ishiet | 524107 |
| Mkpa Eto | 524106 |
| Mkpok | 524106 |
| Ndom Eyo | 524106 |
| Nko | 524107 |
| Ntan Ide | 524107 |
| Okat | 524106 |
| Okom | 524106 |
| Oku Ekanem | 524107 |
| Udung – Ndung | 523119 |
| Udung – Uso | 523119 |
| Ukpan | 524106 |