O
- (Igbo-Eze-South) Ovoko
- (Nkanu West) Obe
- (Awgu) Obeagu
- (Nsukka) Obimo
- (Udi) Obinagu
- (Aninri) Obinefu-Nenwe
- (Udi) Obioma
- (Aninri) Obuagu
- (Nsukka) Obukpa
- (Oji-River) Obule-Inyi
- (Ezeagu) Oha
- (Aninri) Ogbaku
- (Awgu) Ogbaku-Ndiagu
- (Udenu) Ogbodu-Aba
- (Igbo-Eze-North) Ogboli
- (Uzo-Uwani) Ogbo-Uvuru
- (Isi-Uzo) Ogo-Ndago
- (Awgu) Ogugu
- (Oji-River) Ogunta
- (Uzo-Uwani) Ogboso
- (Nkanu East) Onitsha-Agu
- (Enugu South) Obeagu
- (Nkanu West) Oliemba
- (Nkanu West) Oloafor
- (Nkanu East) Onoafor
- (Nkanu West) Ogbosine
- (Igbo-Eze-North) Ogrita
- (Nsukka) Onome
- (Aninri) Oduma
- (Nsukka) Obelagu-Obimo Leja