There are 4 places named Koga in Japan.
All places in the world called "Koga".
Ono (18)
Ota (17)
Hongo (16)
Minato (15)
Wada (15)
Ohama (14)
Tomari (14)
Kawasaki (14)
Hama (14)
Nakamura (13)
Hara (13)
Nagahama (13)
Oshima (13)
Sakai (12)
Yoshida (12)
Okubo (12)
Kawaguchi (11)
Funakoshi (11)
Shinden (11)
Seto (11)
Okawa (11)
Kanayama (11)
Hirose (11)
Takata (10)
Oura (10)
Otani (10)
Shirahama (10)
Ichiba (10)
Ikeda (10)
Kamo (10)