O
- (Ovia South-West) Ofaye
- (Ovia North-East) Oduna
- (Oredo) Odogu
- (Ovia North-East) Odogbo
- (Uhunmwonde) Odjeva
- (Ovia North-East) Odigietue
- (Orhionmwon) Odigi
- (Ovia North-East) Odighi
- (Ovia North-East) Odighi
- (Etsako West) Odige
- (Esan South-East) Odegune
- (Esan South-East) Odegumu
- (Owan East) Obviomu
- (Ikpoba-Okha) Obenevbueribo
- (Orhionmwon) Oben
- (Esan North-East) Obedu
- (Ovia North-East) Obazuwa
- (Ovia North-East) Obazua
- (Orhionmwon) Obazagbon-Nugu
- (Ikpoba-Okha) Obazagbon
- (Ikpoba-Okha) Obayantor
- (Ikpoba-Okha) Obayantor
- (Orhionmwon) Obayanta
- (Ikpoba-Okha) Obaretin
- (Ovia North-East) Obarenren
- (Egor) Obanyotor
- (Orhionmwon) Obanaghoro
- (Ikpoba-Okha) Obamahan
- (Orhionmwon) Obagie
- (Ikpoba-Okha) Obagie