| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Alla, Olumbanasa | 432115 |
| Postal/ZIP Codes in Igbedor, Olumbanasa | 432115 |
| Postal/ZIP Codes in Igbokenyi, Olumbanasa | 432115 |
| Postal/ZIP Codes in Inoma, Olumbanasa | 432115 |
| Postal/ZIP Codes in Odeh, Olumbanasa | 432115 |
| Postal/ZIP Codes in Odekpe, Olumbanasa | 432115 |
| Postal/ZIP Codes in Odomagwu, Olumbanasa | 432115 |
| Postal/ZIP Codes in Onugwa, Olumbanasa | 432115 |