UNC recruits both in and out of the state of North Carolina, and a look at this year's roster will give you a sense of the usual proportion of in-state to out-of-state players.
I note, bhs, that you're from South Carolina. Two of next year's signed players hail from the Palmetto State, while 7 of the 12 are North Carolinians. The remaining 3 are from Connecticut, New Jersey, and Florida.
Here's a link to the official announcement of that NLI class:
Class of 2007-2008 AnnouncementAfter you've read it, I'd suggest that you take the opportunity to look around the official website from which it's taken. Like other programs' sites, it'll tell you a lot about the program.
In addition to the "scholarship stretching" dynamic to which Midlo Dad correctly points in an earlier post, another factor that ends up affecting all of UNC's athletic programs to a certain extent is that admissions standards are generally higher for out-of-state students. Because the "bar" is generally higher, it stands to reason that fewer out-of-state players would make the roster.
If you or others have specific questions about the program or school, send me a private message; and, I'll do my best to help you with information.
Best of luck to you.