A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
| 9th United States Congress | |
|---|---|
8th ← → 10th | |
 United States Capitol (1800) | |
March 4, 1805 – March 4, 1807 | |
| Members | 34 senators 142 representatives 3 non-voting delegates |
| Senate majority | Democratic-Republican |
| Senate President | George Clinton (DR) |
| House majority | Democratic-Republican |
| House Speaker | Nathaniel 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.
Major events
- March 4, 1805: President Thomas Jefferson begins his second term.
- June 1, 1805: First Barbary War ends.
- November 7, 1805: Lewis and Clark Expedition arrives at the Pacific Ocean.
- September 23, 1806: Lewis and Clark Expedition returns to St. Louis, Missouri, thereby ending the exploration of the Louisiana Territory and the Pacific Northwest.
- February 19, 1807: Former Vice President Aaron Burr is tried for conspiracy and acquitted.
Major legislation
- March 29, 1806: Cumberland Road, ch. 19, 2 Stat. 357
- February 24, 1807: Seventh Circuit Act of 1807, ch. 16, (2 Stat. 420)
- March 2, 1807: Act Prohibiting Importation of Slaves, ch. 22, 2 Stat. 426
- March 3, 1807: Insurrection Act, ch. 39, 2 Stat. 443
Territories organized
- June 30, 1805: Michigan Territory was formed from a portion of the Indiana Territory
Samuel Smith (DR)
Nathaniel Macon (DR)
Party summary
The count below identifies party affiliations at the beginning of the first session of this Congress. Changes resulting from subsequent replacements are shown below in the "Changes in membership" section.