14 largest Japanese cities:
(estimated populations as of 2016)

Tokyo 23 wards 9.3 million
Yokohama 3.7 million
Osaka 2.7 million
Nagoya 2.3 million
Sapporo 1.9 million
Fukuoka 1.5 million
Kobe 1.5 million
Kawasaki 1.5 million
Kyoto 1.5 million
Saitama 1.3 million
Hiroshima 1.2 million
Sendai 1.1 million
Chiba     1.0 million
Kitakyushu     1.0 million