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.

Elkhorn is a city and the county seat of Walworth County, Wisconsin, United States. It is located 40 miles (64 km) southwest of Milwaukee. As of the 2020 census, it was home to 10,247 people, up from 10,084 at the 2010 census.