The 86th United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from January 3, 1959, to January 3, 1961, during the last two years of the presidency of Dwight D. Eisenhower.

The 85th United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from January 3, 1957, to January 3, 1959, during the fifth and sixth years of Dwight Eisenhower's presidency. The apportionment of seats in the House of Representatives was based on the 1950 United States census.