There are 8 US Post Offices in Middlesex County serving a total of 8,441 residents equating to 1,055 residents per post office. It's estimated that approximately 13,473 packages are handled across the 8 county post offices annually. Middlesex County is a county located on the Middle Peninsula in the U.S. state of Virginia. As of the 2010 census, the population was 10,959. Its county seat is Saluda."