The 20th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1827, to March 4, 1829, during the third and fourth years of John Quincy Adams's presidency. The apportionment of seats in the House of Representatives was based on the 1820 United States census. Both chambers had a Jacksonian majority.

The 19th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1825, to March 4, 1827, during the first two years of John Quincy Adams's presidency. The apportionment of seats in the House of Representatives was based on the 1820 United States census. The Senate had a majority of Jackson Men, while the House had an Anti-Jackson (pro-Adams) majority.