Akashi is a city in southern Hyōgo Prefecture, Japan. As of 1 February 2024, the city had an estimated population of 305,925 in 137,288 hou…Akashi is a city in southern Hyōgo Prefecture, Japan. As of 1 February 2024, the city had an estimated population of 305,925 in 137,288 households and a population density of 6,200 people per km². The total area of the city is 49.42 square kilometres.