sentences:  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.Some of the first European settlers of what would become the county were English Quakers, who settled along the Haw and Eno rivers.