There are 6 US Post Offices in Richmond County serving a total of 45,222 residents equating to 7,537 residents per post office. It's estimated that approximately 72,179 packages are handled across the 6 county post offices annually. Richmond County is a county located in the U.S. state of North Carolina. As of the 2010 Census, the population was 46,639. Its county seat is Rockingham. Richmond County comprises the Rockingham, NC Micropolitan Statistical Area."