Kosai is a city located in far western Shizuoka Prefecture, Japan. As of 30 June 2019, the city had an estimated population of 57,885 in 24,232 …Kosai is a city located in far western Shizuoka Prefecture, Japan. As of 30 June 2019, the city had an estimated population of 57,885 in 24,232 households, and a population density of 668.7 persons per km². The total area of the city is 85.65 square kilometres.
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