Utsunomiya is the capital and largest city of Tochigi Prefecture in the northern Kantō region of Japan. As of 1 July 2023, the city had an est…Utsunomiya is the capital and largest city of Tochigi Prefecture in the northern Kantō region of Japan. As of 1 July 2023, the city had an estimated population of 513,584, and a population density of 1,232 persons per square kilometre. The total area of the city is 416.85 km. Utsunomiya is famous for its gyoza. There are more than two hundred gyoza restaurants in Utsunomiya.