1964 United States Senate elections (A Sad day in November)

The 1964 United States Senate elections coincided with the election of President Hubert Humphrey by a strong majority. His Democratic Party picked up one seat from the Republicans.The Senate election coincided with Democratic gains in the House in the same year.

Retirements
There were no net party changes from retirements.

Democrats replaced by Democrats

 * 1) Tennessee (Class 2): Appointee Herbert S. Walters (D) was replaced by Ross Bass (D)

Elections leading to the next Congress
In these general elections, the winners were elected for the term beginning January 3, 1965; ordered by state.

All of the elections involved the Class 1 seats.