Tachikawa is a city located in the western portion of Tokyo Prefecture, Japan. As of 1 March 2021, the city had an estimated population of 1…Tachikawa is a city located in the western portion of Tokyo Prefecture, Japan. As of 1 March 2021, the city had an estimated population of 184,383 in 93,428 households, and a population density of 7600 persons per km². The total area of the city is 24.36 square kilometres.
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