There are 5 US Post Offices in Oscoda County serving a total of 10,965 residents equating to 2,193 residents per post office. It's estimated that approximately 17,501 packages are handled across the 5 county post offices annually. Oscoda County is a county located in the U.S. state of Michigan. As of the 2010 census, the population was 8,640, making it the fifth-least populous county in Michigan. The county seat is Mio."