There are 5 US Post Offices in Lincoln County serving a total of 77,135 residents equating to 15,427 residents per post office. It's estimated that approximately 123,116 packages are handled across the 5 county post offices annually. Lincoln County is a county located in the U.S. state of North Carolina. As of the 2010 census, the population was 78,265. Its county seat is Lincolnton. Lincoln County is included in the Charlotte-Concord-Gastonia, NC-SC Metropolitan Statistical Area."