O
- (Ika South) Obidugbo
- (Ika South) Obi-Anyima
- (Ukwuani) Obiakambu
- (Ndokwa East) Obetim-Uno
- (Bomadi) Ogbeinyama
- (Warri North) Obaghoro
- (Warri South) Obagboro
- (Ughelli South) Ogoni
- (Isoko North) Onogboko
- (Ethiope East) Oke
- (Okpe) Ogborode
- (Aniocha South) Ogbo-Obi
- (Ughelli South) Olota
- (Ika North East) Owa-Alero
- (Okpe) Okuokpokpo
- (Ughelli North) Owevwe
- (Warri North) Ologbeh
- (Warri North) Ogbabin
- (Sapele) Oghareki
- (Ethiope West) Onaghagha
- (Ethiope West) Ovade New Site
- (Ethiope West) Otumara
- (Ethiope West) Obromudu
- (Ethiope West) Ogharefe Junction
- (Ethiope West) Okwirhie
- (Ethiope West) Okwegba
- (Ethiope West) Otefe
- (Ethiope West) Ogen
- (Ethiope West) Okueka
- (Ethiope West) Otefe