Walworth County is a county located in the U.S. state of Wisconsin. As of the 2010 census, the population was 102,228. Its county seat is Elkhorn. The county was created in 1836 from Wisconsin Territory and organized in 1839. It is named for Reuben H. Walworth. Walworth County comprises the Whitewater-Elkhorn, WI Micropolitan Statistical Area and is included in the Milwaukee-Racine-Waukesha, WI Combined Statistical Area. Lake Geneva, the University of Wisconsin-Whitewater, and Alpine Valley Resort, and Music Theatre are located in Walworth County.

Lake Geneva is a city in the U.S. state of Wisconsin. Located in Walworth County and situated on Geneva Lake, it is home to an estimated 8,105 people as of 2019, up from 7,651 at the 2010 census. It is located about 50 miles southwest of Milwaukee and 80 miles northwest of Chicago. Given its relative proximity to both the Chicago metropolitan and Milwaukee metropolitan areas, it has become a popular resort city that thrives on tourism.

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.

Janesville is a city in southern Wisconsin, United States. It is the county seat and largest city of Rock County, is a principal municipality of the Janesville, Wisconsin, Metropolitan Statistical Area and is included in the Madison-Janesville-Beloit, WI Combined Statistical Area. As of the 2010 census, the city had a population of 63,575.