There are 2 US Post Offices in Lee County serving a total of 37,947 residents equating to 18,974 residents per post office. It's estimated that approximately 60,568 packages are handled across the 2 county post offices annually. Lee County is a county located in the U.S. state of North Carolina. As of the 2010 census, the population was 57,866. Its county seat is Sanford. The county was formed in 1907 from parts of Chatham County, Moore County and Harnett County. It was named for the Confederate general Robert E. Lee who fought during the American Civil War. Lee County comprises the Sanford Micropolitan Statistical Area, which is a part of the greater Raleigh-Durham-Chapel Hill, NC Combined Statistical Area, which had a 2012 estimated population of 1,998,808."