O
- (Ahiazu-Mbaise) Oparanadim
- (Isiala Mbano) Obiohoro Osu
- (Owerri North) Oratta
- (Ngor-Okpala) Orisaeze
- (Owerri North) Orji
- (Owerri West) Orogwe
- (Ideato North) Osina
- (Oru East) Oteru
- (Aboh-Mbaise) Ovoro
- (Oguta) Onwakiko
- (Owerri North) Owelu
- (Nkwerre) Owerri
- (Isu) Obeakpu
- (Mbatoli) Ohoba
- (Unuimo) Obiogo
- (Isiala Mbano) Obiohuru
- (Ezinihitte) Obizi
- (Ezinihitte) Oboama
- (Aboh-Mbaise) Oboama-Nguru
- (Ohaji/Egbema) Obofia
- (Ahiazu-Mbaise) Obohia
- (Ngor-Okpala) Obokwe
- (Ngor-Okpala) Obokwe
- (Isiala Mbano) Obolo
- (Nwangele) Obolo
- (Aboh-Mbaise) Obor Ovoro
- (Oguta) Obudi-Agwa
- (Ohaji/Egbema) Obufie-Mmahu
- (Ahiazu-Mbaise) Obwe
- (Ngor-Okpala) Ochicha