Tateyama is a city located in Chiba Prefecture, Japan. As of 1 November 2020, the city had an estimated population of 44,865 in 20,558 house…Tateyama is a city located in Chiba Prefecture, Japan. As of 1 November 2020, the city had an estimated population of 44,865 in 20,558 households and a population density of 410 persons per km². The total area of the city is 110.05 square kilometres.