There are 6 US Post Offices in Essex County serving a total of 10,580 residents equating to 1,763 residents per post office. It's estimated that approximately 16,887 packages are handled across the 6 county post offices annually. Essex County is a county located in the Middle Peninsula in the U.S. state of Virginia; the peninsula is bordered by the Rappahannock River on the north and the York River on the south. As of the 2010 census, the population was 11,151. Its county seat is Tappahannock."