- Democratic congressional and state primaries: closed
- Republican congressional and state primaries: closed
- Democratic Presidential primary: closed
- Republican Presidential primary: closed
- Voters may or may not choose to affiliate with a political party, however, affiliation with a party is required to vote in primary elections.
- 34% of Oregon voters are registered as nonaffiliated or independent.
Details of voting in congressional and state primary elections:
- Voters must affiliate with a party in order to vote in that party's primary.
- Voter registration closes 21 days before the election.