There are 5 US Post Offices in Caldwell County serving a total of 80,605 residents equating to 16,121 residents per post office. It's estimated that approximately 128,655 packages are handled across the 5 county post offices annually. Caldwell County is a county located in the U.S. state of North Carolina in the foothills of the Appalachian Mountains. As of the 2010 census, the population was 83,029. Its county seat is Lenoir. Caldwell County is part of the Hickory\u2013Lenoir\u2013Morganton, NC Metropolitan Statistical Area."