There are 53 US Post Offices in Wayne County serving a total of 1,535,076 residents equating to 28,964 residents per post office. It's estimated that approximately 2,450,153 packages are handled across the 53 county post offices annually. Wayne County is the most populous county in the U.S. state of Michigan. As of the 2010 census, its population was 1,820,584, making it the 19th-most populous county in the United States. The 2014 Census update listed the county's population at 1,764,804. The county seat is Detroit, the most populous city in Michigan and 18th-most populous city in the United States. The county was founded in 1796 and organized in 1815. Wayne County is included in the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area. It is one of several American counties named after Revolutionary War General Anthony Wayne."