1918 United States Senate elections


The 1918 United States Senate elections were held throughout 1918, the midpoint of Woodrow Wilson's second term as President of the United States. Republicans gained a slim 2-seat control after picking up a net 6 seats.
The change in control meant that the Republicans could deny entry of the United States into the League of Nations. American participation in this new international institution was the centerpiece of Wilson's post-war foreign policy.
It was the first election in which all Class 2 senators were subject to direct or popular election following the enactment of the Seventeenth Amendment, making them the final class under the old system.

Gains and losses

Republicans gained seven seats:
Democrats gained one seat:
These numbers represent composition at the March 4, 1919 start of the 66th United States Congress. Composition often changes due to deaths, resignations, or party shifting.
Source:

Change in composition

Before the elections

Elections results

Key:

Complete list of races

Special elections during the 65th Congress

In these special elections, the winner was seated during 1918 or before March 4, 1919; ordered by election date.

Elections leading to the 66th Congress

In these general elections, the winners were elected for the term beginning March 4, 1919; ordered by state.
All of the elections involved the Class 2 seats.

Alabama

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

Idaho

Idaho (General)

Idaho (Special)

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Louisiana (General)

Louisiana (Special)

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Missouri (General)

Missouri (Special)

Montana

Nebraska

Nevada

Nevada (General)

Nevada (Special)

New Hampshire

New Hampshire (General)

New Hampshire (Special)

New Jersey

New Jersey (General)

New Jersey (Special)

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Oregon (General)

Oregon (Special)

Pennsylvania

Rhode Island

South Carolina

South Carolina (General)

The Democratic primary was held August 27, 1918.

South Carolina (Special)

The Democratic primary was held August 27, 1918, and a run-off between William P. Pollock and Thomas H. Peeples was held September 10, 1918.

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

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