by List, Japan (funnet 17 elementer). Liste av stedene starter med "O":
Ogachi District- Akita
Ogasawara- Tokyo
Oita (2 elementer)
Okawa District- Kagawa
Okayama (2 elementer)
Oki District- Shimane
Okinawa
Oku District- Okayama (2 elementer)
Okushiri District- Hokkaido
Omagari- Akita
Ono District- Gifu (2 elementer)
Osaka (2 elementer)
Oshima District- Kagoshima
Oshima District- Yamaguchi
Oshima- Tokyocho
Otaru- Hokkaido
Owase- Mie