- Democratic congressional and state primaries: open
- Republican congressional and state primaries: open
- Democratic Presidential primary: mixed
- Republican Presidential primary: mixed
- Voters may or may not choose to affiliate with a political party.
- 33% of North Carolina voters are registered as unaffiliated.
Details of voting in congressional and state primary elections:
- Voters do not have to declare a party affiliation in order to vote in the primary, but they must choose one party's ballot.