Koganei 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…Koganei is a city located in the western portion of Tokyo Prefecture, Japan. As of 1 March 2021, the city had an estimated population of 123,698 in 61,832 households. The total area of the city is 11.30 square kilometres so the population density is about 11,000 persons per km².
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