@bluebayou , @AlmostThere2018 is correct. UNC fills the undergraduate cap to its fullest since their pay is >triple in state tuition. And as you mentioned UNC has a lot of grad students that are mostly out of state. The “natives” on my block who had lived in NC the longest emigrated from Russia in the 1980s. Literally no one was born in NC. The triangle (raleigh/durham/chapel hill has majority of residents not going back more than 1 generation in NC. When adjusted for size Durham has one of the largest percentages of newcomers.
https://indyweek.com/news/archives/newcomers-changing-face-durham-s-population/