O
- (Bende) Ozu-Item
- (Arochukwu) Ozu-Abam
- (Isuikwuato) Ozara
- (Ukwa West) Ozanta
- (Obi Nwga) Owo
- (Isiala-Ngwa North) Owerrinta
- (Ugwunagbo) Owerri Aba
- (Isiala-Ngwa North) Ovuoku
- (Isiala-Ngwa North) Ovu Ngwu
- (Isiala-Ngwa North) Ovorji
- (Obi Nwga) Ovom
- (Isuikwuato) Ovim
- (Ikwuano) Otoro-Nchara
- (Isuikwuato) Otampa
- (Ugwunagbo) Osusu Aku
- (Isiala-Ngwa South) Osusu
- (Osisioma Ngwa) Oso Okwa
- (Afikpo South) Oso
- (Osisioma Ngwa) Osia Umu-Mgbede
- (Obi Nwga) Osa
- (Isuikwuato) Oriendu
- (Bende) Onu-Ibina
- (Arochukwu) Onuasu
- (Arochukwu) Onuasu
- (Isuikwuato) Onuaku Uturu
- (Obi Nwga) Onicha Ngwa
- (Ikwuano) Oloko
- (Ikwuano) Oleri
- (Umuahia North) Okwuta
- (Umuahia South) Okwu