Settsu is a city located in Osaka Prefecture, Japan. As of 1 October 2022, the city had an estimated population of 87,143 in 40,825 households and a population density of 5700 persons per km2. The total area of the city is 76.49 square kilometres (29.53 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.