Toyonaka is a city in Osaka Prefecture, Japan. As of 1 May 2023, the city had an estimated population of 399,263 in 179651 households and a population density of 5700 persons per km2. The total area of the city is 36.39 square kilometres (14.05 sq mi). It is a suburban city of Osaka City and a part of the Kyoto-Osaka-Kobe metropolitan area.

Osaka Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Osaka Prefecture has a population of 8,778,035 and has a geographic area of 1,905 square kilometres (736 sq mi). Osaka Prefecture borders Hyōgo Prefecture to the northwest, Kyoto Prefecture to the north, Nara Prefecture to the southeast, and Wakayama Prefecture to the south.