The 64th 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 March 4, 1915, to March 4, 1917, during the third and fourth years of Woodrow Wilson's presidency. The apportionment of seats in the House of Representatives was based on the 1910 United States census. The Democrats maintained a majority in both chambers (albeit reduced in the House) and, along with President Wilson, also maintained an overall federal government trifecta.

Major events

Major legislation

Treaties

Party summary

Senate

House of Representatives

Leadership

Senate

House of Representatives

Majority (Democratic) leadership

Minority (Republican) leadership

Members

Senate

Prior to the 64th Congress, per Article 1, Section 3, Clause 1 of the Constitution, all senators had been "chosen by the [State] Legislature thereof." (As a practical matter, many senators had been "elected"; however, technically, those elections were subject to affirmation by the State Legislatures.) However, 32 senators of the 64th Congress - those of Senate Class 3 - were directly elected by popular vote in the 1914 United States Senate Elections as directed by the 17th Amendment. The 17th stipulated that it "...shall not be so construed as to affect the election or term of any senator chosen before it becomes valid as part of the Constitution." Thus, Class 1 and 2 senators were not subject to election until 1916 and 1918, respectively. (Note, however, that should a senator have perished prior to the end of his term, then their replacement would have been subject to direct election as they would not have been "chosen before" ratification. This is why Augustus Bacon was the first senator constitutionally elected on July 15, 1913.)

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 64th Congress in March 1915.

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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:64 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