- Congressional and state primaries: nonpartisan, Top Two
- Democratic Presidential primary: mixed
- Republican Presidential primary: closed
- Washington has nonpartisan registration. There is no option to affiliate with a political party on the voter registration form.
Details of voting in congressional and state primary elections:
- Washington uses a nonpartisan, Top Two primary system.
- There is no party affiliation in Washington state.
- All registered voters receive the same ballot regardless of party affiliation. The the two candidates with the most votes move on to the general election.