Green Bay () is a city in the U.S. state of Wisconsin. The county seat of Brown County, it is 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. It is above sea level and north of Milwaukee. As of the U.S. Census Bureau's July 1, 2019 estimate, Green Bay had a population of 104,578, making it the third-largest in the state of Wisconsin, after Milwaukee and Madison, and the third-largest city on Lake Michigan's west shore, after Chicago and Milwaukee.