Ichikawa is a city in western Chiba Prefecture, Japan. As of 31 January 2024, the city had an estimated population of 492,749 in 256,229 hou…Ichikawa is a city in western Chiba Prefecture, Japan. As of 31 January 2024, the city had an estimated population of 492,749 in 256,229 households and a population density of 8577 persons per km². The total area of the city is 57.45 square kilometres. The city has a concentration of the wide-area traffic network that connects the center of Tokyo with many areas of Chiba Prefecture. Major rail routes and roads pass through the city.