O
- (Kwahu South) Obomen
- (Ayensuano) Obonwu
- (Akuapim North) Obosomasi
- (Lower Manya Krobo) Ofonsa
- (Kwahu North) Obosumanu
- (Kwahu East) Oboyani
- (Kwahu East) Oboyani
- (West Akim) Obuohu
- (Birim South) Obuonifo
- (Ayensuano) Obuonsu
- (Yilo Krobo) Obusumasua
- (Akyemansa) Ochereso
- (Kwaebibirem) Ochwineso
- (Asuogyaman) Odawkom
- (Asuogyaman) Osukwau
- (Upper West Akim) Oparekrom
- (Yilo Krobo) Opesika
- (Yilo Krobo) Opleyo
- (East Akim) Oseem
- (West Akim) Osenasi
- (Birim Central) Osenho
- (Akyemansa) Oshiansheda
- (Asuogyaman) Osibi
- (Fanteakwa) Osino
- (Kwahu East) Osuben
- (Kwahu East) Onyimso
- (Upper West Akim) Otakorasi
- (Ayensuano) Otareso
- (Yilo Krobo) Oterkpolu
- (Ayensuano) Otoasi