There are 9 US Post Offices in Chatham County serving a total of 46,090 residents equating to 5,121 residents per post office. It's estimated that approximately 73,565 packages are handled across the 9 county post offices annually. Chatham County (local /\u02cct\u0283\u00e6t\u0259m/ CHA-t\u0259m) is a county located in the Piedmont area of the U.S. state of North Carolina. As of the 2010 census, the population was 63,505. Its county seat is Pittsboro. Chatham County is part of the Durham-Chapel Hill, NC Metropolitan Statistical Area, which is also included in the Raleigh-Durham-Chapel Hill Combined Statistical Area, which has a population of 1,998,808 as of U.S. Census 2012 Population Estimates."