Walworth County is a county located in the U.S. state of Wisconsin. As of the 2020 census, the population was 106,478. 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.

Wisconsin's 5th congressional district is a congressional district of the United States House of Representatives in Wisconsin, covering most of Milwaukee's northern and western suburbs. It presently covers all of Washington and Jefferson counties, most of Waukesha County, and portions of Dodge, Milwaukee and Walworth counties. It is currently represented by Republican Scott Fitzgerald.