The 1940 United States presidential election in Idaho took place on November 5, 1940, as part of the 1940 United States presidential election. State voters chose four representatives, or electors, to the Electoral College, who voted for president and vice president.

The 2020 United States presidential election in Idaho was held on Tuesday, November 3, 2020, as part of the 2020 United States presidential election in which all 50 states plus the District of Columbia participated. Idaho voters chose electors to represent them in the Electoral College via a popular vote, pitting the Republican Party's nominee, incumbent President Donald Trump, and running mate Vice President Mike Pence against Democratic Party nominee, former Vice President Joe Biden, and his running mate California Senator Kamala Harris. Idaho has four electoral votes in the Electoral College.