There are 31 US Post Offices in Milwaukee County serving a total of 838,695 residents equating to 27,055 residents per post office. It's estimated that approximately 1,338,651 packages are handled across the 31 county post offices annually. 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. Milwaukee County is included in the Milwaukee-Waukesha-West Allis, WI Metropolitan Statistical Area as well as the Milwaukee-Racine-Waukesha, WI Combined Statistical Area."