Wakayama is the capital city of Wakayama Prefecture in the Kansai region of Japan. As of 1 December 2021, the city had an estimated populati…Wakayama is the capital city of Wakayama Prefecture in the Kansai region of Japan. As of 1 December 2021, the city had an estimated population of 351,391 in 157066 households and a population density of 1700 persons per km². The total area of the city is 208.84 square kilometres.