The following table indicates the parties of elected officials in the U.S. state of Idaho: The table also indicates the historical party composition in the: For years in which a presidential election was held, the table indicates which party's nominees received the state's electoral votes.
The parties are as follows: Democratic (D), Democratic–Populist fusion (D/P), Democratic–Populist–Silver Republican fusion (D/P/SR), Democratic–Silver Republican fusion (D/SR), Independent (I), Populist (P), Republican (R), Socialist (S), Silver Republican (SR), and a tie or coalition within a group of elected officials.