| Place | Post Code |
|---|---|
| Enino, Okpo Clan | 523105 |
| Eyiba, Okpo Clan | 523105 |
| Eyo-Ating, Okpo Clan | 523105 |
| Eyo Ating Osung, Okpo Clan | 523105 |
| Eyo Esin, Okpo Clan | 523105 |
| Eyo Esio Usung, Okpo Clan | 523105 |
| Eyo Uliong, Okpo Clan | 523105 |
| Eyobiosio, Okpo Clan | 523105 |
| Eyofin, Okpo Clan | 523105 |
| Eyoko, Okpo Clan | 523105 |
| Eyokponung, Okpo Clan | 523105 |
| Eyokpu, Okpo Clan | 523105 |
| Eyosio-Osung, Okpo Clan | 523105 |
| Eyotai, Okpo Clan | 523105 |
| Udng Otok, Okpo Clan | 523105 |
| Udung Adatang, Okpo Clan | 523105 |
| All postal codes in Udung-Uko | |
|---|---|
| Afaha Okpo, Udung-Uko | |
| Okpo Clan, Udung-Uko | |
| Ubodung, Udung-Uko | |
| Ubodung Clan, Udung-Uko | |