There are 6 US Post Offices in Charlevoix County serving a total of 27,048 residents equating to 4,508 residents per post office. It's estimated that approximately 43,172 packages are handled across the 6 county post offices annually. Charlevoix County is a county in the U.S. state of Michigan. As of the 2010 census, the population was 25,949. The county seat is Charlevoix."