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

Major legislation

Territories organized

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.

Senate

House of Representatives

Leadership

Senate

House of Representatives

Members

This list is arranged by chamber, then by state. Senators are listed by class, and representatives are listed by district.

Senate

Senators were elected by the state legislatures every two years, with one-third beginning new six-year terms with each Congress. Preceding the names in the list below are Senate class numbers, which indicate the cycle of their election.

Connecticut

Delaware

Georgia

Kentucky

Maryland

Massachusetts

New Hampshire

New Jersey

New York

North Carolina

Ohio

Pennsylvania

Rhode Island

South Carolina

Tennessee

Vermont

Virginia

[Senators' party membership by state at the opening of the 9th Congress in March 1805.

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House of Representatives

The names of members of the House of Representatives are listed by their district numbers

Connecticut

All representatives were elected statewide on a general ticket.

Delaware

Georgia

All representatives were elected statewide on a general ticket.

Kentucky

Maryland

The 5th district was a plural district with two representatives.

Massachusetts

New Hampshire

All representatives were elected statewide on a general ticket.

New Jersey

All representatives were elected statewide on a general ticket.

New York

North Carolina

Ohio

Pennsylvania

There were four plural districts, the 1st, 2nd and 3rd had three representatives each, the 4th had two representatives.

Rhode Island

Both representatives were elected statewide on a general ticket.

South Carolina

Tennessee

Vermont

Virginia

Non-voting members

Changes in membership

The count below reflects changes from the beginning of this Congress.

Senate

House of Representatives

Committees

Lists of committees and their party leaders.

Senate

House of Representatives

Joint committees

Employees

Legislative branch agency directors

Senate

House of Representatives