Starting in 1890, presidents ''pro tempore'' serve until a new one was elected.
- John J. Ingalls (R-KS) April 3, 1890 - March 2, 1891
- Charles F. Manderson (R-NE) March 2, 1891 - March 22, 1893
- Isham G. Harris (D-TN) March 22, 1893 - January 7, 1895
- Matt W. Ransom (D-NC) January 7-10, 1895
- Isham G. Harris (D-TN) January 10 - March 3, 1895
- William P. Frye (R-ME) February 7, 1896 - April 27, 1911
See Also: Presidents pro tempore of the United States Senate, 1911-1913
After Frye's death, the Senate had difficulty electing a successor. For the remainder of the 62nd Congress (1911-1913), the position alternated among:
In the next Congress, the selection process returned to as it had been since 1891:
- James P. Clarke (D-AR) March 13, 1913 - October 1, 1916
- Willard Saulsbury (D-DE) December 14, 1916 - March 3, 1919
- Albert B. Cummins (R-IA) May 19, 1919 - March 6, 1925
- George H. Moses (R-NH) March 6, 1925 - March 3, 1933
- Key Pittman (D-NV) March 9, 1933 - November 10, 1940
- William H. King (D-UT) November 19, 1940 - January 3, 1941
- B. Patton Harrison (D-MS) January 6 - June 22, 1941
- Carter Glass (D-VA) July 10, 1941 - January 2, 1945
- Kenneth McKellar (D-TN) January 6, 1945 - January 2, 1947
- Arthur H. Vandenberg (R-MI) January 4, 1947 - January 2, 1949
- Kenneth McKellar (D-TN) January 3, 1949 - January 2, 1953
- Styles Bridges (R-NH) January 3, 1953 - January 4, 1955
- Walter F. George (D-GA) January 5, 1955 - January 2, 1957
- Carl T. Hayden (D-AZ) January 3, 1957 - January 2, 1969
- Richard B. Russell, Jr. (D-GA) January 3, 1969 - January 21, 1971
- Allen J. Ellender (D-LA) January 22, 1971 - July 27, 1972
- James O. Eastland (D-MS) July 28, 1972 - December 27, 1978
- Warren G. Magnuson (D-WA) January 15, 1979 - December 4, 1980
- Milton R. Young (R-ND) December 5, 1980
- Warren G. Magnuson (D-WA) December 6, 1980 - January 4, 1981
- J. Strom Thurmond (R-SC) January 5, 1981 - January 5, 1987
- John C. Stennis (D-MS) January 6, 1987 - January 2, 1989
- Robert C. Byrd (D-WV) January 3, 1989 - January 3, 1995
- J. Strom Thurmond (R-SC) January 4, 1995 - January 3, 2001
- Robert C. Byrd (D-WV) January 3 - 20, 2001
- J. Strom Thurmond (R-SC) January 20 - June 6, 2001
- Robert C. Byrd (D-WV) June 6, 2001 - January 3, 2003
- Theodore F. Stevens (R-AK) January 3, 2003 - Present
Carter Glass (1941-1945) was the last president ''pro tempore'' not to be the senior member of the majority party, aside from the single day accorded Milton Young (1980), who was the retiring senior member of the party that had been elected to a majority in the incoming congress.
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