Toyama is the capital city of Toyama Prefecture, Japan, located on the coast of the Sea of Japan in the Chūbu region on central Honshū, ab…Toyama is the capital city of Toyama Prefecture, Japan, located on the coast of the Sea of Japan in the Chūbu region on central Honshū, about 200 km north of the city of Nagoya and 300 km northwest of Tokyo. As of 1 June 2019, the city had an estimated population of 415,844 in 176,643 households, and a population density of 335 persons per km². Its total area was 1,241.77 square kilometres.