9th United States Congress

9th United States Congress
8th ←
→ 10th

March 4, 1805 – March 4, 1807
Members34 senators
142 representatives
3 non-voting delegates
Senate majorityDemocratic-Republican
Senate PresidentGeorge Clinton (DR)
House majorityDemocratic-Republican
House SpeakerNathaniel Macon (DR)
Sessions
Special: March 4, 1805 – March 4, 1805
1st: December 2, 1805 – April 21, 1806
2nd: December 1, 1806 – March 4, 1807

The 9th 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, 1805, to March 4, 1807, during the fifth and sixth years of Thomas Jefferson's presidency. The apportionment of seats in the House of Representatives was based on the 1800 United States census. Both chambers had a Democratic-Republican majority.

The Lewis and Clark Expedition scouted the Louisiana Territory and the Pacific Northwest.