There are 11 US Post Offices in Brown County serving a total of 176,124 residents equating to 16,011 residents per post office. It's estimated that approximately 281,114 packages are handled across the 11 county post offices annually. Brown County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 248,007, making it the fourth-most populous county in Wisconsin. The county seat is Green Bay. Brown County is part of the Green Bay, WI Metropolitan Statistical Area."