Hayakawa is a town located in Yamanashi Prefecture, Japan. As of 2020, the town had an estimated population of 1,098 and a population density of 2.97 persons per km². The total area of the town is 369.86 square kilometres. It has the smallest population of any town in Japan. Hayakawa is on the list of The Most Beautiful Villages in Japan, established in 2…Hayakawa is a town located in Yamanashi Prefecture, Japan. As of 2020, the town had an estimated population of 1,098 and a population density of 2.97 persons per km². The total area of the town is 369.86 square kilometres. It has the smallest population of any town in Japan. Hayakawa is on the list of The Most Beautiful Villages in Japan, established in 2005.