Beloit is a city located in Rock County within the state of Wisconsin in the United States. Situated in southern Wisconsin, the city lies along the Rock River and sits on the state border with Illinois.
As of the 2020 census, Beloit had a population of 36,657 residents. It is part of the Janesville–Beloit metropolitan statistical area, which consists entirely of Rock County and has an estimated population of 165,000.