Yokohama - Wikipedia Yokohama (Japanese: 横浜; pronounced ⓘ) is the second-largest city in Japan by population [1] as well as by area, and the country's most populous municipality [a] It is the capital and most populous city in Kanagawa Prefecture, with a population of 3 7 million in 2023 It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu