The 66th United States Congress was a meeting of the legislative branch of the United States federal government, comprising the United States Senate and the United States House of Representatives. It met in Washington, D.C., from March 4, 1919, to March 4, 1921, during the last two years of Woodrow Wilson's presidency. The apportionment of seats in the House of Representatives was based on the 1910 United States census. The Republicans won majorities in both the House and the Senate, thus taking control of both chambers. This is the last congress to have no female members of congress in the House of Representatives, and thus the last time there was an all-male congress (several subsequent congresses, up to the 96th Congress, would have periods with no women in the Senate but several in the House).

Major legislation

Major events

A brief special session was called by President Wilson in March 1919, because of a filibuster that had successfully blocked appropriations bills needed to fund day-to-day government operations.

Constitutional amendments

Treaties

Party summary

Senate

House of Representatives

Leadership

Senate leadership

Presiding

Majority (Republican) leadership

Minority (Democratic) leadership

House leadership

Presiding

Majority (Republican) leadership

Minority (Democratic) leadership

Members

Senate

In this Congress, Class 3 meant their term ended with this Congress, requiring reelection in 1920; Class 1 meant their term began in the last Congress, requiring reelection in 1922; and Class 2 meant their term began in this Congress, requiring reelection in 1924.

Alabama

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

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 66th Congress in March 1919.

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House of Representatives

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

Alabama

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

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

[[File:66 us house membership.png|thumb|400px|

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

Caucuses

Employees

Legislative branch agency directors

Senate

House of Representatives