There are 3 places named Oga in Japan.
All places in the world called "Oga".
Ono (18)
Ota (17)
Hongo (16)
Wada (15)
Minato (15)
Ohama (14)
Tomari (14)
Kawasaki (14)
Hama (14)
Nakamura (13)
Oshima (13)
Hara (13)
Nagahama (13)
Sakai (12)
Yoshida (12)
Okubo (12)
Okawa (11)
Kanayama (11)
Hirose (11)
Kawaguchi (11)
Funakoshi (11)
Shinden (11)
Seto (11)
Shirahama (10)
Ichiba (10)
Kamo (10)
Ikeda (10)
Shimizu (10)
Yamada (10)
Takada (10)