Hamamatsu is a city located in western Shizuoka Prefecture, Japan. It serves as the prefecture's largest city, with an estimated population of 780,128 across 340,591 households as of September 2023. The urban area covers approximately 1,558.06 km², resulting in a population density of about 500 per square kilometer.
The city is notable for its high quality of life; it ranked first in the happiness index of Japan's government-designated cities in both 2018 and 2022, according to data published by the Japan Research Institute.