Ō
- (Sakai-shi) Ōmino
- (Kishiwada Shi) Ōsawachō
- (Izumi Shi) Ōnochō
- (Sakai-shi) Ōtori-minamimachi
- (Osaka-shi) Ōmiya
- (Kaizuka Shi) Ōkawa
- (Izumisano Shi) Ōgi
- (Ibaraki Shi) Ōiwa
- (Sakai-shi) Ōtori-higashimachi
- (Sakai-shi) Ōtori-nishimachi
- (Osaka-shi) Ōtemae
- (Sennan-gun) Ōkubo-naka
- (Sakai-shi) Ōhama-nakamachi
- (Toyono Gun) Ōzato
- (Takatsuki Shi) Ōkanmurichō
O
- (Izumi Shi) Okachō
- (Izumi Shi) Onoichō
- (Kishiwada Shi) Obuchō
- (Kishiwada Shi) Okayamachō
- (Kawachi-nagano Shi) Oyamadachō
- (Tondabayashi Shi) Ochikata
- (Sakai-shi) Owai
- (Sennan-gun) Ogaito
- (Sennan Shi) Okada
- (Sennan Shi) Onosato
- (Matsubara-shi) Oka
- (Toyonaka Shi) Okamachi
- (Hannan Shi) Ozakichō
- (Shijonawate) Okayama
- (Yao-shi) Onji-nakamachi