The 1864 United States general election elected the members of the 39th United States Congress. Nevada joined the union during the 39th Congress. This election took place during the Third Party System and the Civil War. Republicans kept control of the Presidency and both houses of Congress.
In the Presidential election, incumbent Republican Abraham Lincoln defeated Democratic General George B. McClellan. Lincoln's win made him the first President to win re-election since Andrew Jackson, and the first two-term President unaffiliated with the Democratic-Republican Party or the Democratic Party since George Washington.
Republicans made major gains in the House, turning their plurality into a majority.
In the Senate, Republicans gained several seats, and continued to hold a commanding majority.