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Milwaukee County () is located in the U.S. state of Wisconsin. At the 2020 census, the population was 939,489, down from 947,735 in 2010. It is both the most populous and most densely populated county in Wisconsin, and the 45th most populous county nationwide; Milwaukee, its eponymous county seat, is also the most populous city in the state. The county was created in 1834 as part of Michigan Territory and organized the following year.Milwaukee County is the most populous county of the Milwaukee-Waukesha-West Allis, WI Metropolitan Statistical Area, as well as of the Milwaukee-Racine-Waukesha, WI Combined Statistical Area (See Milwaukee metropolitan area).
Uniquely among Wisconsin counties, Milwaukee County is completely incorporated (i.e.: no part of the county has the Town form of local government - see Administrative divisions of Wisconsin#Town). There are 19 municipalities in Milwaukee County, 10 incorporated as cities and 9 incorporated as villages. After the city of Milwaukee, the most populous in 2019 were West Allis (59,890), Wauwatosa (48,118), Greenfield (37,221), Oak Creek (36,325), and Franklin (35,811). The county is home to two major-league professional sports teams, the Milwaukee Bucks and Milwaukee Brewers, and the world's largest music festival, Summerfest.