Green Bay is a city in and the county seat of Brown County, Wisconsin, United States. It is located at the head of Green Bay (known locally as "the bay of Green Bay"), a sub-basin of Lake Michigan at the mouth of the Fox River. As of the 2020 census, the city had a population of 107,395, making it the third-most populous city in Wisconsin, after Milwaukee and Madison, and the third-most populous city on Lake Michigan, after Chicago and Milwaukee. Green Bay is the principal city of the Green Bay metropolitan area, which covers Brown, Kewaunee, and Oconto counties and had 320,050 residents in 2020. Green Bay is the home city of the National Football League (NFL)'s Green Bay Packers.