Oberhausen

North Rhine-Westphalia, Oberhausen

Obihiro

Obihiro, Hokkaido, Japan

Ōbu

Ōbu, Aichi

Oceanside

California, Oceanside

Ōdate

Akita, Ōdate

Odawara

Odawara, Kanagawa, Japan

Odessa TX

Texas, Odessa

Offenbach am Main

Hesse, Offenbach am Main

Ōgaki

Ōgaki, Gifu

Ōita

Ōita, Ōita, Japan

Okayama

Okayama, Okayama, Japan

Okazaki

Okazaki, Aichi

Okinawa

Okinawa, Okinawa, Japan

Olathe

Kansas, Olathe

Oldenburg

Lower Saxony, Oldenburg

Oldham

Oldham, Greater Manchester

Ōme

Ōme, Tokyo, Japan

Ōmihachiman

Ōmihachiman, Shiga, Japan

Ōmura

Nagasaki, Ōmura, Japan

Ōmuta

Ōmuta, Fukuoka

Ōnojō

Ōnojō, Fukuoka

Onomichi

Onomichi, Hiroshima, Japan

Ontario, CA

California, Ontario

Orange

California, Orange

Orem UT

Utah, Orem

Orlando

Florida, Orlando

Orléans

Centre-Val de Loire, Orléans

Osaka

Osaka, Osaka, Japan

Ōsaki

Ōsaki, Miyagi, Japan

Oshawa

Ontario, Oshawa

Ōshū

Ōshū, Iwate, Japan

Osnabrück

Lower Saxony, Osnabrück

Ōta, Gunma

Ōta, Japan, Gunma

Otaru

Otaru, Hokkaido, Japan

Ōtsu

Ōtsu, Shiga, Japan

Ottawa

Ontario, Ottawa