Registered Democrats are leading the way at the polls, representing 45 percent of all votes through Monday. But Republicans have comprised 38 percent of the early voters even though they make up only 32 percent of overall voter registrations.
More than 450,000 votes have been cast so far.
The election includes a U.S. Senate race at the top of the ballot along with the state's 13 congressional seats. Voting will also decide the balance of power in the state's General Assembly.
The heaviest voting has been in the 11th district covering western North Carolina and the 7th District covering the state's southeast.