The 90th 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, 1967, to January 3, 1969, during the last two years of President Lyndon B. Johnson's second term in office. The apportionment of seats in this House of Representatives was based on the 1960 United States census. Both chambers had a Democratic majority; however, the Democrats lost seats in both the Senate and the House, which cost them both their 2/3rds supermajority in the Senate and their supermajority status in the House. Along with President Johnson, the Democrats maintained an overall federal government trifecta.

Major events

Major legislation

Constitutional amendments

Party summary

[[Image:90 us house membership.png|thumb|300px| The count below identifies party affiliations at the beginning of the first session of this Congress, and includes members from vacancies and newly admitted states, when they were first seated. Changes resulting from subsequent replacements are shown below in the "Changes in membership" section.

[Party standings on the opening day of the 90th Congress

{{legend|#0000ff|64 Democratic Senators}} {{legend|#ff0000|36 Republican Senators|undefined | upload.wikimedia.org/wikipedia/commons/4/40/090senate.svg]

Senate

House of Representatives

Leadership

Senate

Majority (Democratic) leadership

Minority (Republican) leadership

House of Representatives

Majority (Democratic) leadership

Minority (Republican) leadership

Caucuses

Members

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

Senate

Senators are popularly elected statewide 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. In this Congress, Class 1 meant their term began in the last Congress, requiring re-election in 1970; Class 2 meant their term began with this Congress, requiring re-election in 1972; and Class 3 meant their term ended with this Congress, requiring re-election in 1968.

Alabama

Alaska

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

Hawaii

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Montana

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

[Senators' party membership by state at the opening of the 90th Congress in January 1967

{{legend|#0044aa|2 Democrats}} {{legend|#660080|1 Democrat and 1 Republican}} {{legend|#aa0000|2 Republicans|undefined | upload.wikimedia.org/wikipedia/commons/3/3f/90th///United///States///Congress///Senators.svg]

House of Representatives

The names of members of the House of Representatives elected statewide on the general ticket or otherwise at-large, are preceded by an "At-large," and the names of those elected from districts, whether plural or single member, are preceded by their district numbers.

Alabama

Alaska

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

Hawaii

Both representatives were elected at-large statewide on a general ticket

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Montana

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

Non-voting member

Changes in membership

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

Senate

House of Representatives

Committees

Senate

House of Representatives

Joint committees

Employees

Legislative branch agency directors

Senate

House of Representatives