More than 120,000 voters have registered since the end of the year.
Roughly half of the new voters have registered as Democrats, a little more than a third are unaffiliated and about 13 percent are Republicans, according to figures from the State Board of Elections.
Overall, the number of voters increased by about 2 percent to 5.7 million, Rob Christensen reports.
"It started back in late December," said Johnnie McLean, the deputy state elections director. "It's obviously due to the presidential primaries."
Barack Obama's campaign is registering voters this week on college campuses, at shopping centers, in high schools and in restaurants in an aggressive push to meet Friday's deadline to register the traditional way.
Hillary Clinton's campaign is taking a different tack. It is focusing on a new North Carolina law allowing people to register and vote simultaneously at early voting stops between April 17 and May 3.
"From an efficiency standpoint, we are going to be running one of the most aggressive voter registration efforts in North Carolina history," said Mike Trujillo, Clinton's state field director.