Waukesha (/ˈwɔːkɪʃɔː/) is a city in and the county seat of Waukesha County, Wisconsin, United States with a population of 72,489 in 2017. It is part of the Milwaukee metropolitan area. Its population was 70,718 at the 2010 census. From 1846 to 1847, the city was called Prairieville. In 2021, six people were killed in a vehicle-ramming attack.