There are 10 US Post Offices in Sampson County serving a total of 58,909 residents equating to 5,891 residents per post office. It's estimated that approximately 94,025 packages are handled across the 10 county post offices annually. Sampson County is a county located in the U.S. state of North Carolina. As of the 2010 Census, the population was 63,431. Its county seat is Clinton."