There are 4 places named Ko in Japan.
All places in the world called "Ko".
Ono (18)
Ota (17)
Hongo (16)
Wada (15)
Minato (15)
Tomari (14)
Kawasaki (14)
Hama (14)
Ohama (14)
Nakamura (13)
Oshima (13)
Hara (13)
Nagahama (13)
Okubo (12)
Yoshida (12)
Sakai (12)
Hirose (11)
Kawaguchi (11)
Funakoshi (11)
Shinden (11)
Seto (11)
Okawa (11)
Kanayama (11)
Shimizu (10)
Yamada (10)
Takada (10)
Ogawa (10)
Ohara (10)
Nakayama (10)
Takata (10)