There are 9 US Post Offices in Lexington County serving a total of 142,404 residents equating to 15,823 residents per post office. It's estimated that approximately 227,293 packages are handled across the 9 county post offices annually. Lexington County is a county located in the U.S. state of South Carolina. As of the 2010 census, the population was 262,391, and the 2014 population estimate was 277,888. Its county seat and largest town is Lexington. The county was created in 1785. Its name commemorates the Battle of Lexington in the American Revolutionary War. Lexington County is part of the Columbia, SC Metropolitan Statistical Area."