Ōami
Chiba
Ōamishirasato
Ōarai
Ibaraki
Obama
Fukui
Obanazawa
Yamagata
Obihiro
Hokkaido
Obita
Nagasaki
Ōbu
Aichi
Oda
Shimane
Ōdachō-ōda
Ōdate
Akita
Odawara
Kanagawa
Ōfunato
Iwate
Oga
Ōgaki
Gifu
Ogasawara
Tokyo
Ogawa
Saitama
Ogi
Saga
Ogōri
Fukuoka
Ogōri-shimogō
Yamaguchi
Ōhara
Ōi
Ōiso
Ōita
Oita
Ojiya
Niigata
Ōkawa
Ōkawara
Miyagi
Okaya
Nagano
Okayama
Okazaki
Okegawa
Okinawa
Ōkuchi-shinohara
Kagoshima
Okunoya
Ōmachi
Omaezaki
Shizuoka
Ōmagari
Ōmamachō-ōmama
Gunma
Ōme
Omigawa
Ōmihachiman
Shiga
Omitama
Ōmiya
Ōmura
Ōmuta
Onagawa Chō
Ono
Hyōgo
Ōno-hara
Hiroshima
Onoda
Ōnojō
Onomichi
Osaka
Ōsaka
Ōsaka-sayama
Ōsaki
Ōshima
Ōshū
Ōta
Ōtake
Otaru
