Ō
- (Minamishimabara-shi) Ōsaki
- (Nagasaki-shi) Ōishi
- (Minamishimabara-shi) Ōe
- (Hirado Shi) Ōshimamura-kōnoura
- (Hirado Shi) Ōshimamura-azuchi-kawachi
- (Minamimatsuura Gun) Ōzera
- (Sasebo Shi) Ōsaki
- (Tsushima-shi) Ōkubo
- (Tsushima-shi) Ōchi
- (Tsushima-shi) Ōita
- (Matsuura Shi) Ōyama
- (Sasebo Shi) Ōhazu
- (Hirado Shi) Ōtō
- (Hirado Shi) Ōkubochō
- (Hirado Shi) Ōyamachō