There are 7 US Post Offices in Orange County serving a total of 141,745 residents equating to 20,249 residents per post office. It's estimated that approximately 226,241 packages are handled across the 7 county post offices annually. Orange County is a county located in the U.S. state of North Carolina. As of the 2010 census, the population was 133,801. Its county seat is Hillsborough. Orange County is included in the Durham-Chapel Hill, NC Metropolitan Statistical Area, which is also included in the Raleigh-Durham-Chapel Hill, NC Combined Statistical Area, which had a 2012 estimated population of 1,998,808. It is home to the University of North Carolina at Chapel Hill, an institution of the University of North Carolina System and the oldest state-supported university in the United States."