There are 6 US Post Offices in Caswell County serving a total of 14,704 residents equating to 2,451 residents per post office. It's estimated that approximately 23,469 packages are handled across the 6 county post offices annually. Caswell County is a county located in the U.S. state of North Carolina. As of the 2010 census, the population was 23,719. Its county seat is Yanceyville."