Waukesha () is a city in and the county seat of Waukesha County, Wisconsin, United States. It is part of the Milwaukee metropolitan area. Its population was 70,718 at the 2010 census. The city is adjacent to the Village of Waukesha.

Brookfield is a city located in Waukesha County, Wisconsin, United States in the Milwaukee metropolitan area. It had a population of 37,920 in the 2010 census. Brookfield is the third largest city in Waukesha County. The city is adjacent to the Town of Brookfield.

Jefferson County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 83,686. Its county seat is Jefferson. Jefferson County comprises the Watertown-Fort Atkinson, WI Micropolitan Statistical Area, which is also included in the Milwaukee-Racine-Waukesha, WI Combined Statistical Area.

Whitewater is a city located in Walworth and Jefferson counties in the U.S. state of Wisconsin. Located near the southern portion of the Kettle Moraine State Forest, Whitewater is the home of the University of Wisconsin–Whitewater. As of the 2010 census, the city's population was 14,390, which includes 11,150 in Walworth County and 3,240 in Jefferson County.