Ō
- (Amakusa Shi) Ōhira
- (Amakusa Shi) Ōno
- (Amakusa Shi) Ōhamamachi
- (Amakusa Shi) Ōyazaki
- (Amakusa Shi) Ōmiyada
- (Amakusa Shi) Ōno
- (Amakusa Shi) Ōsako
- (Kamiamakusa Shi) Ōtani
- (Amakusa Shi) Ōhara
- (Amakusa Shi) Ōhira
- (Amakusa Shi) Ōkubo
- (Amakusa Shi) Ōmatsudo
- (Amakusa Shi) Ōishigaura
- (Amakusa Shi) Ōya
- (Amakusa Shi) Ōmazaki
- (Amakusa Shi) Ōno
- (Amakusa Shi) Ōshima
- (Amakusa Gun) Ōyaguchi
- (Amakusa Gun) Ōkawachi
- (Kamiamakusa Shi) Ōgata
- (Kamiamakusa Shi) Ōyanomachi-kami
- (Kamiamakusa Shi) Ōtehara
- (Amakusa Shi) Ōwatari
- (Kamiamakusa Shi) Ōyanomachi-naka