- Democratic congressional and state primaries: mixed
- Republican congressional and state primaries: mixed
- Democratic Presidential primary: mixed
- Republican Presidential primary: mixed
- Voters may or may not choose to affiliate with a political party, however, affiliation with a party is required to vote in primary elections.
- 10% of voters in Wyoming are registered as unaffiliated.
Details of voting in congressional and state primary elections:
- Voters must affiliate with a party to vote in that party's primary.
- Unaffiliated voters may register with a party at the polls on primary election day to vote in that party's primary.