The 100th 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, 1987, to January 3, 1989, during the last two years of Ronald Reagan's presidency. The apportionment of seats in the House of Representatives was based on the 1980 United States census. This is the most recent Congress with a Democratic senator from the state of Mississippi, John C. Stennis, who retired at the end of Congress, and a Republican senator from the state of Connecticut, Lowell Weicker, who lost re-election in 1988. Both chambers had a Democratic majority, with the Democrats increasing their lead in the House, and regaining the Senate for the first time since the 96th Congress from 1979 to 1981.

Major events

Major legislation

Treaties ratified

Hearings

Party summary

Senate

[Senators' party membership by state at the opening of the 100th Congress in January 1987

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House of Representatives

Leadership

Senate

Majority (Democratic) leadership

Minority (Republican) leadership

House of Representatives

Majority (Democratic) leadership

Minority leadership

Caucuses

Members

This list is arranged by chamber, then by state. Senators are listed by class, 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, In this Congress, Class 1 meant their term ended with this Congress, facing re-election in 1988; Class 2 meant their term began in the last Congress, facing re-election in 1990; and Class 3 meant their term began in this Congress, facing re-election in 1992.

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

House of Representatives

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

Non-voting members

Changes in membership

Senate

House of Representatives

Committees

Senate

House of Representatives

Joint committees

Employees

Legislative branch agency directors

Senate

House of Representatives