Hirosaki is a city located in western Aomori Prefecture, Japan. As of 1 April 2020, the city had an estimated population of 168,739 in 71,716 households, and a population density of 330 persons per km2. The total area of the city is 524.20 square kilometers. Hirosaki developed as a castle town for the 100,000 koku Hirosaki Domain ruled by the Tsugaru clan. The city is currently a regional commercial center, and the largest producer of apples in Japan.