O
- (Ika South) Owuwu Two
- (Ndokwa East) Otuoku
- (Ndokwa East) Owele-Utchi
- (Oshimili North) Ogu-Ozella
- (Burutu) Ozobo
- (Ika South) Ozarra
- (Ika South) Ozarra
- (Ika South) Oyoko
- (Sapele) Oyohe
- (Isoko North) Oyode
- (Burutu) Oyangbene
- (Udu) Ovwodokpokpor
- (Isoko South) Owodokpokpor
- (Udu) Owhrode
- (Ndokwa West) Owe
- (Ika North East) Owa-Ofie
- (Ika South) Owa-Nta
- (Ukwuani) Owah-Abe
- (Ika North East) Owa-Alizomor
- (Ika North East) Owa-Aliosimi
- (Ika South) Owa-Alidima
- (Ughelli North) Ovwori
- (Ughelli South) Ovwodokpokpor
- (Ughelli South) Ovwo
- (Ughelli South) Ovwakwa
- (Ethiope East) Ovu Inland
- (Ethiope East) Ovu
- (Isoko North) Ovrode
- (Burutu) Ovworigbala Jeremi
- (Ughelli South) Oviri-Olomu