sentences:  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, the flagship institution of the University of North Carolina System and the oldest state-supported university in the United States.