There are 10 US Post Offices in Alcona County serving a total of 12,974 residents equating to 1,297 residents per post office. It's estimated that approximately 20,708 packages are handled across the 10 county post offices annually. Alcona County is a county of the U.S. state of Michigan. As of the 2010 census, the population was 10,942. Its county seat is Harrisville. Alphabetically it is the first county in Michigan, as its flag states \"First of 83\"."