There are 4 US Post Offices in Caldwell County serving a total of 80,046 residents equating to 20,012 residents per post office. It's estimated that approximately 127,762 packages are handled across the 4 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."