- Oda
- Ōkōuchi
- Ōmine
- Ōzono
- Ōchigi
- Ōkawachichō-hei
- Ōkawachichō-kō
- Ōkawachichō-otsu
- Ōkawachō-higashitashiro
- Ōkawachō-kawabaru
- Ōkawachō-komanaki
- Ōkawachō-ōkawano
- Ōkawachō-tatsugawa
- Ōkawachō-yamaguchi
- Okuno
- Ōtsubochō-kō
- Ōtsubochō-otsu
- Ōmagari
- Ōchichō-chōgiri
- Ōchichō-hirayamakami
- Ōchichō-hirayamashimo
- Ōchichō-ikisa
- Ōchichō-kuroiwa
- Ōchichō-mutabe
- Ōchichō-nagaheta
- Ōchichō-ōchi
- Ōchichō-ōno
- Ōchichō-sari
- Ōchichō-senzoku
- Ōchichō-tagashira