Ichinomiya is a city located in Aichi Prefecture, Japan. The city is sometimes called Owarichinomiya to avoid confusion with other municipalities of the same name, including Ichinomiya and Ichinomiya in Chiba Prefecture. As of 1 October 2019, the city had an estimated population of 379,654 in 161,434 households, and a population density of 3,336 persons per km2. The total area of the city was 113.82 square kilometres (43.95 sq mi).

Aichi Prefecture is a prefecture of Japan located in the Chūbu region of Honshū. Aichi Prefecture has a population of 7,552,873 and a geographic area of 5,172.92 square kilometres (1,997.28 sq mi) with a population density of 1,460 inhabitants per square kilometre (3,800/sq mi). Aichi Prefecture borders Mie Prefecture to the west, Gifu Prefecture and Nagano Prefecture to the north, and Shizuoka Prefecture to the east. Nagoya is the capital and largest city of the prefecture.