Milwaukee County is a county  in the U.S. state of Wisconsin. As of the 2010 census, the population was 947,735 and was estimated to be 956,406 in 2014. It is the most populous county in Wisconsin and the 45th most populous in the United States. Its county seat is Milwaukee, which 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.