There are 4 US Post Offices in Bamberg County serving a total of 15,500 residents equating to 3,875 residents per post office. It's estimated that approximately 24,740 packages are handled across the 4 county post offices annually. Bamberg County is a county located in the U.S. state of South Carolina. As of the 2010 census, the population was 15,987, making it the fourth-least populous county in South Carolina. Its county seat is Bamberg."