Chiba is the capital city of Chiba Prefecture, Japan. It sits about 40 kilometres east of the centre of Tokyo on Tokyo Bay. The city becam…Chiba is the capital city of Chiba Prefecture, Japan. It sits about 40 kilometres east of the centre of Tokyo on Tokyo Bay. The city became a government-designated city in 1992. In December 2024, its population was 985,059, with a population density of 3,605 people per km². The city has an area of 271.77 square kilometres.