Japón

O

• (Ochi-gun) Onbara
• (Ōshima-gun) Oshikaku
• (Ōshima-gun) Omo
• (Ōshima-gun) Okazen
• (Mine Shi) Ofukuchō-shimo
• (Shimonoseki Shi) Ozukichō
• (Daisen-shi) Okita
• (Yokote Shi) Omonogawamachi-usui
• (Kitaakita-shi) Onaginai
• (Minamiakita-gun) Ochiai
• (Akita Shi) Orito

Ō

• (Niimi Shi) Ōtada
• (Yonago Shi) Ōbukuro
• (Ōta-shi) Ōdachō-yoshinaga
• (Ōshima-gun) Ōjiro
• (Tsushima-shi) Ōkubo
• (Tsushima-shi) Ōchi
• (Mine Shi) Ōminechō-nishibun
• (Hagi Shi) Ōi
• (Tsushima-shi) Ōita
• (Nikaho-shi) Ōtake
• (Yokote Shi) Ōmorimachi-hakamagata
• (Yokote Shi) Ōmorimachi-itaida
• (Iwate-gun) Ōshuku
• (Semboku-gun) Ōyashiki
• (Daisen-shi) Ōta
• (Waga-gun) Ōishi
• (Semboku-shi) Ōsawa
• (Kashima-shi) Ōfunatsu
• (Yurihonjō-shi) Ōkoya