Hirakawa is a city located in Aomori Prefecture, Japan. As of 31 January 2023, the city had an estimated population of 30,086 in 14,181 house…Hirakawa is a city located in Aomori Prefecture, Japan. As of 31 January 2023, the city had an estimated population of 30,086 in 14,181 households, and a population density of 89 persons per km². The total area of the city is 346.01 square kilometres.