- Ōbō
- Ōchichō-chōgiri
- Ōchichō-hirayamakami
- Ōchichō-hirayamashimo
- Ōchichō-ikisa
- Ōchichō-kuroiwa
- Ōchichō-mutabe
- Ōchichō-nagaheta
- Ōchichō-ōchi
- Ōchichō-ōno
- Ōchichō-sari
- Ōchichō-senzoku
- Ōchichō-tagashira
- Ōchichō-yokomakura
- Ōchigi
- Oda
- Odorise
- Ogimachi
- Ogimachi-funada
- Ogimachi-haruke
- Ogimachi-hatakeda
- Ogimachi-ikenoue
- Ogimachi-iwakura
- Ogimachi-kurihara
- Ogimachi-matsuo
- Ōishimachi
- Oka
- Ōka
- Okaguchi
- Ōkawachichō-hei