The 84th 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, 1955, to January 3, 1957, during the third and fourth years of Dwight D. Eisenhower's presidency. The apportionment of seats in the House of Representatives was based on the 1950 United States census.

The 83rd United States Congress was a meeting of the legislative branch of the federal government of the United States in Washington, D.C. from January 3, 1953, until January 3, 1955, during the last two weeks of the Truman administration, with the remainder spanning the first two years of Dwight Eisenhower's presidency. It was composed of the Senate and the House of Representatives. The apportionment of seats in the House was based on the 1950 U.S. census.