There are 8 US Post Offices in Miller County serving a total of 20,738 residents equating to 2,592 residents per post office. It's estimated that approximately 33,100 packages are handled across the 8 county post offices annually. Miller County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 24,748. Its county seat is Tuscumbia. The county was organized February 6, 1837 and named for John Miller, former U.S. Representative and Governor of Missouri."