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.