Glendale is a city in Milwaukee County, Wisconsin, United States. It is a suburb of the neighboring Milwaukee. The population was 13,357 at t…Glendale is a city in Milwaukee County, Wisconsin, United States. It is a suburb of the neighboring Milwaukee. The population was 13,357 at the 2020 census. Glendale is located at 43°7′48″N 87°55′40″W / 43.13000°N 87.92778°W.