Hamamatsu (浜松市, Hamamatsu-shi) is a city located in western Shizuoka Prefecture, Japan. In September 2023, the city had an estimated population of 780,128 in 340,591 households,[1] making it the prefecture's largest city, with a population density of 500/km2 (1,300/sq mi) over the total urban area of 1,558.06 km2 (601.57 sq mi). Hamamatsu is a member of the World Health Organization's Alliance for Healthy Cities (AFHC).[2] Hamamatsu is 260 kilometres (160 mi) southwest of Tokyo.[3]