Ōtsuki is a city located in Yamanashi Prefecture, Japan. As of 1 October 2023, the city had an estimated population of 21,835 in 10207 house…Ōtsuki is a city located in Yamanashi Prefecture, Japan. As of 1 October 2023, the city had an estimated population of 21,835 in 10207 households, and a population density of 86 persons per km². The total area of the city is 380.25 square kilometres.
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