These are the main Cities of the Japan
Okinawa
Oita
Osaka
Okayama
Other Towns and Villages in Japan
Obihiro
Odawara
Ogaki
Okazaki
Onomichi
Otaru
Otsu
Oyama
The cities with the letter O are: Obu, Okazaki, Owariasahi, Odate, Oga, Ozu, Obama, Ono, Omuta, Okawa, Ogon, Onojo, Ogaki, Ota, Onomichi, Otake, Otaru, Obihiro, Omitama, Ofunato, Osh, Okuchi, Odawara, Owase, Osaki, Okaya, Omachi, Omura, Ojiya, Oita, Okayama, Okinawa, Osaka, Osakasayama, Ogi, Okegawa, Otsu, Omihachiman, Oda, Omaezaki, Oyama, Otawara, Ome, Oyabe, Obanazawa, and Otsuki.
The first place I think of is Osaka. Hope this was helpful :)
Osaka Okinawa, Oita and Okayama
Oberhausen is a famous city in Germany. Osaka is a city in Japan. Oslo is the capital city in Norway. Ottawa is the capital city in Canada.
o
Ontario
Orofino is a city in Idaho.
Omaha
Jōyō is a city in Japan begining with the letter J..There are no 'foreign' cities in Japan, all cities in Japan are Japenese.
Ottawa
Hiroshima, Japan
· Orange is a city in Australia
Oakdale is a city in Minnesota.
Oakland, CA
Oslo