O
- (Isoko North) Oghrere
- (Ughelli North) Opre
- (Ughelli North) Ojuvwre
- (Ughelli North) Odjighori
- (Ughelli North) Okpara
- (Ughelli North) Omavovwe
- (Ughelli North) Opheri
- (Isoko South) Olecha
- (Ughelli North) Otuwodo
- (Isoko North) Oteri-Iyede
- (Isoko North) Osabari-Okpe Camp
- (Ndokwa East) Okoroafor
- (Isoko North) Otewo Camp
- (Ndokwa East) Onogboko
- (Isoko South) Okrama
- (Isoko South) Okrama
- (Ndokwa East) Okporo Camp
- (Ndokwa East) Okube Station
- (Ndokwa East) Osutu
- (Ndokwa East) Obodo-Ichekere-Aku
- (Isoko South) Okpare
- (Isoko South) Okpari
- (Isoko South) Okpahwa
- (Isoko South) Okekaro
- (Isoko South) Otoka
- (Isoko South) Otude
- (Ughelli South) Oguname
- (Ughelli South) Orere
- (Isoko South) Obotoke
- (Ughelli North) Ohori-Uvwedor