| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Anumkpu, Oko | 423117 |
| Postal/ZIP Codes in Eziabor, Oko | 423121 |
| Postal/ZIP Codes in Ezioko, Oko | 423121 |
| Postal/ZIP Codes in Ifite, Oko | 423121 |
| Postal/ZIP Codes in Ihengwu, Oko | 423121 |
| Postal/ZIP Codes in Okeani, Oko | 423121 |
| Postal/ZIP Codes in Uhuama, Oko | 423117 |