I've been looking into this and the most info I can come up with was from a post on another forum.
http://www.carolinashootersforum.com/archive/index.php/t-50530.html
Here's the most informative reply:
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HellTeeOne
06-03-2009, 11:50 AM
If you want to kill ferel hogs in NC, you can go several places. None are really any type of a big secret, but you do need to know where they are.
What may be the biggest population in the state is in the Neuse River lowlands in southeastern Johnston County, east of Smithfield and west of Goldsboro. There's over 80k acres of river lowlands wilderness down there, and tons of hogs. They've been there for quite a while, escaping from pens and farms when the Neuse floods, most notably in 1996 and 1999 when Hurricanes Fran and Floyd inundated hog farms in the area. Most of the land here is private, but NCSU has a farm down there on State property I believe you can apply for permits on with the WRC.
Caswell County has a hog population on the game lands, notably on Country Line Creek outside of Yanceyville. 22k acres of game lands here, so you'll want to do some scouting.
There has been a population on The Roanoke River game lands in Bertie County also, but I think that many here have been trapped out by the WRC in recent years. I bet they're still there though.
I've heard Sampson County has a population of hogs as well, but I wouldn't know where to go to find them. There are also isolated small populations of them in certain places in Halifax County west of I-95 from what I've heard.
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Since I missed deer season I've been anxious to get out in the woods. I figured hogs could provide that opportunity, but I'm semi-new to the area and brand new to hog hunting (There weren't any in my part of MI when I was there, but I hear they're starting to sprout up.) I'm curious as to what other NC'ers have to say.