O
- (Ughelli South) Okrika
- (Bomadi) Okrigo
- (Burutu) Okpokunu
- (Isoko North) Okpe
- (Ughelli South) Okpe-Olomu
- (Ughelli South) Okpari
- (Ethiope East) Okpara Waterside
- (Ethiope East) Okpara Inland
- (Ughelli South) Okparabe
- (Oshimili North) Okpanam
- (Ndokwa East) Okpai
- (Warri North) Okoromado (I)
- (Udu) Okolo-Urhie
- (Bomadi) Okoloba
- (Ndokwa East) Okogbele
- (Okpe) Okuejeba
- (Oshimili South) Oko Camp
- (Oshimili North) Oko-Anala
- (Oshimili South) Oko-Anala
- (Oshimili South) Oko-Amako
- (Warri North) Okitimekpo
- (Ika South) Oki-Agbie
- (Ika South) Oki
- (Sapele) Okegberode
- (Warri North) Oke
- (Oshimili North) Okala-Okpuno
- (Oshimili North) Okala
- (Sapele) Ojiguo
- (Ughelli North) Ohoro
- (Okpe) Oha