O
- (Esan South-East) Ogboka
- (Esan South-East) Okhue
- (Esan South-East) Okode
- (Esan South-East) Orekhie-Ivbiela
- (Etsako East) Okpella
- (Orhionmwon) Oki Two
- (Ovia North-East) Ozoguo
- (Uhunmwonde) Ozanisi
- (Owan West) Ozalla
- (Ovia North-East) Ozalana
- (Ovia South-West) Oyinbogbene
- (Orhionmwon) Owo
- (Orhionmwon) Ovbieka
- (Orhionmwon) Owe
- (Orhionmwon) Owe-Ugbakele
- (Ovia North-East) Owan
- (Orhionmwon) Owa
- (Ovia North-East) Ovah
- (Owan East) Otwa
- (Ovia South-West) Otumara
- (Orhionmwon) Otobaye Two
- (Ikpoba-Okha) Otete
- (Akoko-Edo) Ososo
- (Etsako Central) Osomegbe
- (Ovia North-East) Osasimwinoba
- (Esan South-East) Orowa
- (Ovia North-East) Orovie
- (Ovia North-East) Oroghon
- (Orhionmwon) Orogho
- (Iguegben) Ologhe