Milwaukee is the most populous city in the U.S. state of Wisconsin. Located on the western shore of Lake Michigan, it had a population of 577,222 at the 2020 census, making it the 31st-most populous city in the United States and the fifth-most populous city in the Midwest. The Milwaukee metropolitan area has over 1.57 million residents and ranks as the 40th-largest metropolitan area in the nation. The city is the county seat of Milwaukee County.