There are 2 US Post Offices in Union County serving a total of 20,750 residents equating to 10,375 residents per post office. It's estimated that approximately 33,119 packages are handled across the 2 county post offices annually. Union County is a county located in the U.S. state of Georgia. As of the 2010 census, the population was 21,356. The county seat is Blairsville. Its Sole commissioner is Lamar Paris, who has served since 2001."