# List of United States senators from California

California elects United States senators to class 1 and class 3. The state has been represented by 48 people in the Senate since it was admitted to the Union on September 9, 1850. Its U.S. senators are Democrats Alex Padilla and Adam Schiff. Dianne Feinstein was the state's longest serving senator, who served from 1992 until her death in 2023.

## List of senators

| Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2006, 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2006, 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2006, 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2006, 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2006, 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2006, 2012, 2018, and 2024. The next election will be in 2030. | C | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, and 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, and 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, and 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, and 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, and 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, and 2016, and 2022. The next election will be in 2028. |
| # | Senator | Party | Dates in office | Electoral history | T | C | T | Electoral history | Dates in office | Party | Senator | # |
| 1 | John C. Frémont | Democratic | Sep 9, 1850 – Mar 3, 1851 | Elected in 1849. | 1 | 31st | 1 | Elected in 1849. | Sep 9, 1850 – Mar 3, 1855 | Democratic | William M. Gwin | 1 |
| Vacant | Vacant | Vacant | Mar 4, 1851 – Jan 29, 1852 | Legislature failed to elect. | 2 | 32nd | 1 | Elected in 1849. | Sep 9, 1850 – Mar 3, 1855 | Democratic | William M. Gwin | 1 |
| 2 | John B. Weller | Democratic | Jan 30, 1852 – Mar 3, 1857 | Elected late in 1852.Lost re-election. | 2 | 32nd | 1 | Elected in 1849. | Sep 9, 1850 – Mar 3, 1855 | Democratic | William M. Gwin | 1 |
| 2 | John B. Weller | Democratic | Jan 30, 1852 – Mar 3, 1857 | Elected late in 1852.Lost re-election. | 2 | 33rd | 1 | Elected in 1849. | Sep 9, 1850 – Mar 3, 1855 | Democratic | William M. Gwin | 1 |
| 2 | John B. Weller | Democratic | Jan 30, 1852 – Mar 3, 1857 | Elected late in 1852.Lost re-election. | 2 | 34th | 2 | Legislature failed to elect. | Mar 4, 1855 – Jan 13, 1857 | Vacant | Vacant | | 1 |
| 2 | John B. Weller | Democratic | Jan 30, 1852 – Mar 3, 1857 | Elected late in 1852.Lost re-election. | 2 | 34th | 2 | Elected late in 1857. | Jan 14, 1857 – Mar 3, 1861 | Democratic | William M. Gwin | 1 |
| 3 | David C. Broderick | Democratic | Mar 4, 1857 – Sep 16, 1859 | Elected in 1857.Died. | 3 | 35th | 2 | Elected late in 1857. | Jan 14, 1857 – Mar 3, 1861 | Democratic | William M. Gwin | 1 |
| 3 | David C. Broderick | Democratic | Mar 4, 1857 – Sep 16, 1859 | Elected in 1857.Died. | 3 | 36th | 2 | Elected late in 1857. | Jan 14, 1857 – Mar 3, 1861 | Democratic | William M. Gwin | 1 |
| Vacant | Vacant | Vacant | Sep 17, 1859 – Nov 2, 1859 | | 3 | 36th | 2 | Elected late in 1857. | Jan 14, 1857 – Mar 3, 1861 | Democratic | William M. Gwin | 1 |
| 4 | Henry P. Haun | Democratic | Nov 3, 1859 – Mar 4, 1860 | Appointed to continue Broderick's term.Lost election to finish Broderick's term. | 3 | 36th | 2 | Elected late in 1857. | Jan 14, 1857 – Mar 3, 1861 | Democratic | William M. Gwin | 1 |
| 5 | Milton Latham | Democratic | Mar 5, 1860 – Mar 3, 1863 | Elected in 1860 to finish Broderick's term.Lost re-election. | 3 | 36th | 2 | Elected late in 1857. | Jan 14, 1857 – Mar 3, 1861 | Democratic | William M. Gwin | 1 |
| 5 | Milton Latham | Democratic | Mar 5, 1860 – Mar 3, 1863 | Elected in 1860 to finish Broderick's term.Lost re-election. | 3 | 37th | 3 | Elected in 1861.Retired. | Mar 4, 1861 – Mar 3, 1867 | Democratic | James A. McDougall | 2 |
| 6 | John Conness | Republican | Mar 4, 1863 – Mar 3, 1869 | Elected in 1863. | 4 | 38th | 3 | Elected in 1861.Retired. | Mar 4, 1861 – Mar 3, 1867 | Democratic | James A. McDougall | 2 |
| 6 | John Conness | Republican | Mar 4, 1863 – Mar 3, 1869 | Elected in 1863. | 4 | 39th | 3 | Elected in 1861.Retired. | Mar 4, 1861 – Mar 3, 1867 | Democratic | James A. McDougall | 2 |
| 6 | John Conness | Republican | Mar 4, 1863 – Mar 3, 1869 | Elected in 1863. | 4 | 40th | 4 | Elected in 1865. | Mar 4, 1867 – Mar 3, 1873 | Republican | Cornelius Cole | 3 |
| 7 | Eugene Casserly | Democratic | Mar 4, 1869 – Nov 29, 1873 | Elected in 1867.Resigned. | 5 | 41st | 4 | Elected in 1865. | Mar 4, 1867 – Mar 3, 1873 | Republican | Cornelius Cole | 3 |
| 7 | Eugene Casserly | Democratic | Mar 4, 1869 – Nov 29, 1873 | Elected in 1867.Resigned. | 5 | 42nd | 4 | Elected in 1865. | Mar 4, 1867 – Mar 3, 1873 | Republican | Cornelius Cole | 3 |
| 7 | Eugene Casserly | Democratic | Mar 4, 1869 – Nov 29, 1873 | Elected in 1867.Resigned. | 5 | 43rd | 5 | Elected in 1871.Retired. | Mar 4, 1873 – Mar 3, 1879 | Republican | Aaron A. Sargent | 4 |
| Vacant | Vacant | Vacant | Nov 30, 1873 – Dec 22, 1873 | | 5 | 43rd | 5 | Elected in 1871.Retired. | Mar 4, 1873 – Mar 3, 1879 | Republican | Aaron A. Sargent | 4 |
| 8 | John S. Hager | Democratic | Dec 23, 1873 – Mar 3, 1875 | Elected in 1873 to finish Casserly's term.Retired. | 5 | 43rd | 5 | Elected in 1871.Retired. | Mar 4, 1873 – Mar 3, 1879 | Republican | Aaron A. Sargent | 4 |
| 9 | Newton Booth | Anti-Monopoly | Mar 4, 1875 – Mar 3, 1881 | Elected early in 1873.Retired. | 6 | 44th | 5 | Elected in 1871.Retired. | Mar 4, 1873 – Mar 3, 1879 | Republican | Aaron A. Sargent | 4 |
| 9 | Newton Booth | Anti-Monopoly | Mar 4, 1875 – Mar 3, 1881 | Elected early in 1873.Retired. | 6 | 45th | 5 | Elected in 1871.Retired. | Mar 4, 1873 – Mar 3, 1879 | Republican | Aaron A. Sargent | 4 |
| 9 | Newton Booth | Anti-Monopoly | Mar 4, 1875 – Mar 3, 1881 | Elected early in 1873.Retired. | 6 | 46th | 6 | Elected in 1877.Retired. | Mar 4, 1879 – Mar 3, 1885 | Democratic | James T. Farley | 5 |
| 10 | John Franklin Miller | Republican | Mar 4, 1881 – Mar 8, 1886 | Elected in 1881.Died. | 7 | 47th | 6 | Elected in 1877.Retired. | Mar 4, 1879 – Mar 3, 1885 | Democratic | James T. Farley | 5 |
| 10 | John Franklin Miller | Republican | Mar 4, 1881 – Mar 8, 1886 | Elected in 1881.Died. | 7 | 48th | 6 | Elected in 1877.Retired. | Mar 4, 1879 – Mar 3, 1885 | Democratic | James T. Farley | 5 |
| 10 | John Franklin Miller | Republican | Mar 4, 1881 – Mar 8, 1886 | Elected in 1881.Died. | 7 | 49th | 7 | Elected in 1885. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| Vacant | Vacant | Vacant | Mar 9, 1886 – Mar 22, 1886 | | 7 | 49th | 7 | Elected in 1885. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| 11 | George Hearst | Democratic | Mar 23, 1886 – Aug 3, 1886 | Appointed to continue Miller's term.Successor elected. | 7 | 49th | 7 | Elected in 1885. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| 12 | Abram Williams | Republican | Aug 4, 1886 – Mar 3, 1887 | Elected in 1886 to finish Miller's term.Retired. | 7 | 49th | 7 | Elected in 1885. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| 13 | George Hearst | Democratic | Mar 4, 1887 – Feb 28, 1891 | Elected in 1887.Died. | 8 | 50th | 7 | Elected in 1885. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| 13 | George Hearst | Democratic | Mar 4, 1887 – Feb 28, 1891 | Elected in 1887.Died. | 8 | 51st | 7 | Elected in 1885. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| Vacant | Vacant | Vacant | Mar 1, 1891 – Mar 18, 1891 | | 8 | 51st | 7 | Elected in 1885. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| Vacant | Vacant | Vacant | Mar 1, 1891 – Mar 18, 1891 | | 8 | 52nd | 8 | Re-elected in 1891.Died. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| 14 | Charles N. Felton | Republican | Mar 19, 1891 – Mar 3, 1893 | Elected in 1891 to finish Hearst's term.Retired. | 8 | 52nd | 8 | Re-elected in 1891.Died. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| 15 | Stephen M. White | Democratic | Mar 4, 1893 – Mar 3, 1899 | Elected in 1893.Retired. | 9 | 53rd | 8 | Re-elected in 1891.Died. | Mar 4, 1885 – Jun 21, 1893 | Republican | Leland Stanford | 6 |
| 15 | Stephen M. White | Democratic | Mar 4, 1893 – Mar 3, 1899 | Elected in 1893.Retired. | 9 | 53rd | 8 | | Jun 22, 1893 – Jul 25, 1893 | Vacant | Vacant | Vacant |
| 15 | Stephen M. White | Democratic | Mar 4, 1893 – Mar 3, 1899 | Elected in 1893.Retired. | 9 | 53rd | 8 | Appointed to continue Stanford's term.Elected in 1895 to finish Stanford's term. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 15 | Stephen M. White | Democratic | Mar 4, 1893 – Mar 3, 1899 | Elected in 1893.Retired. | 9 | 54th | 8 | Appointed to continue Stanford's term.Elected in 1895 to finish Stanford's term. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 15 | Stephen M. White | Democratic | Mar 4, 1893 – Mar 3, 1899 | Elected in 1893.Retired. | 9 | 55th | 9 | Re-elected in 1897. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| Vacant | Vacant | Vacant | Mar 4, 1899 – Feb 6, 1900 | | 10 | 56th | 9 | Re-elected in 1897. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 16 | Thomas R. Bard | Republican | Feb 7, 1900 – Mar 3, 1905 | Elected late in 1900.Lost re-election. | 10 | 56th | 9 | Re-elected in 1897. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 16 | Thomas R. Bard | Republican | Feb 7, 1900 – Mar 3, 1905 | Elected late in 1900.Lost re-election. | 10 | 57th | 9 | Re-elected in 1897. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 16 | Thomas R. Bard | Republican | Feb 7, 1900 – Mar 3, 1905 | Elected late in 1900.Lost re-election. | 10 | 58th | 10 | Re-elected in 1903. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 17 | Frank P. Flint | Republican | Mar 4, 1905 – Mar 3, 1911 | Elected in 1905.Retired. | 11 | 59th | 10 | Re-elected in 1903. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 17 | Frank P. Flint | Republican | Mar 4, 1905 – Mar 3, 1911 | Elected in 1905.Retired. | 11 | 60th | 10 | Re-elected in 1903. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 17 | Frank P. Flint | Republican | Mar 4, 1905 – Mar 3, 1911 | Elected in 1905.Retired. | 11 | 61st | 11 | Re-elected in 1909.Retired. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 18 | John D. Works | Republican | Mar 4, 1911 – Mar 3, 1917 | Elected in 1911.Retired. | 12 | 62nd | 11 | Re-elected in 1909.Retired. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 18 | John D. Works | Republican | Mar 4, 1911 – Mar 3, 1917 | Elected in 1911.Retired. | 12 | 63rd | 11 | Re-elected in 1909.Retired. | Jul 26, 1893 – Mar 3, 1915 | Republican | George C. Perkins | 7 |
| 18 | John D. Works | Republican | Mar 4, 1911 – Mar 3, 1917 | Elected in 1911.Retired. | 12 | 64th | 12 | Elected in 1914.Lost re-election. | Mar 4, 1915 – Mar 3, 1921 | Democratic | James D. Phelan | 8 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Elected in 1916.Not seated until March 16 in order to remain governor of California. | 13 | 65th | 12 | Elected in 1914.Lost re-election. | Mar 4, 1915 – Mar 3, 1921 | Democratic | James D. Phelan | 8 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Elected in 1916.Not seated until March 16 in order to remain governor of California. | 13 | 66th | 12 | Elected in 1914.Lost re-election. | Mar 4, 1915 – Mar 3, 1921 | Democratic | James D. Phelan | 8 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Elected in 1916.Not seated until March 16 in order to remain governor of California. | 13 | 67th | 13 | Elected in 1920. | Mar 4, 1921 – Mar 3, 1933 | Republican | Samuel M. Shortridge | 9 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1922. | 14 | 68th | 13 | Elected in 1920. | Mar 4, 1921 – Mar 3, 1933 | Republican | Samuel M. Shortridge | 9 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1922. | 14 | 69th | 13 | Elected in 1920. | Mar 4, 1921 – Mar 3, 1933 | Republican | Samuel M. Shortridge | 9 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1922. | 14 | 70th | 14 | Re-elected in 1926.Lost renomination. | Mar 4, 1921 – Mar 3, 1933 | Republican | Samuel M. Shortridge | 9 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1928. | 15 | 71st | 14 | Re-elected in 1926.Lost renomination. | Mar 4, 1921 – Mar 3, 1933 | Republican | Samuel M. Shortridge | 9 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1928. | 15 | 72nd | 14 | Re-elected in 1926.Lost renomination. | Mar 4, 1921 – Mar 3, 1933 | Republican | Samuel M. Shortridge | 9 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1928. | 15 | 73rd | 15 | Elected in 1932.Lost renomination, then resigned. | Mar 4, 1933 – Nov 8, 1938 | Democratic | William Gibbs McAdoo | 10 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1934. | 16 | 74th | 15 | Elected in 1932.Lost renomination, then resigned. | Mar 4, 1933 – Nov 8, 1938 | Democratic | William Gibbs McAdoo | 10 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1934. | 16 | 75th | 15 | Elected in 1932.Lost renomination, then resigned. | Mar 4, 1933 – Nov 8, 1938 | Democratic | William Gibbs McAdoo | 10 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1934. | 16 | 75th | 15 | Appointed to finish McAdoo's term.Retired. | Nov 9, 1938 – Jan 3, 1939 | Democratic | Thomas M. Storke | 11 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1934. | 16 | 76th | 16 | Elected in 1938. | Jan 3, 1939 – Nov 30, 1950 | Democratic | Sheridan Downey | 12 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1940.Died. | 17 | 77th | 16 | Elected in 1938. | Jan 3, 1939 – Nov 30, 1950 | Democratic | Sheridan Downey | 12 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1940.Died. | 17 | 78th | 16 | Elected in 1938. | Jan 3, 1939 – Nov 30, 1950 | Democratic | Sheridan Downey | 12 |
| 19 | Hiram Johnson | Republican | Mar 4, 1917 – Aug 6, 1945 | Re-elected in 1940.Died. | 17 | 79th | 17 | Re-elected in 1944.Ran for re-election, but withdrew from renomination due to ill health.Resigned early due to ill health. | Jan 3, 1939 – Nov 30, 1950 | Democratic | Sheridan Downey | 12 |
| Vacant | Vacant | Vacant | Aug 7, 1945 – Aug 25, 1945 | | 17 | 79th | 17 | Re-elected in 1944.Ran for re-election, but withdrew from renomination due to ill health.Resigned early due to ill health. | Jan 3, 1939 – Nov 30, 1950 | Democratic | Sheridan Downey | 12 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Appointed to continue Johnson's term.Elected in 1946 to finish Johnson's term. | 17 | 79th | 17 | Re-elected in 1944.Ran for re-election, but withdrew from renomination due to ill health.Resigned early due to ill health. | Jan 3, 1939 – Nov 30, 1950 | Democratic | Sheridan Downey | 12 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Elected to full term in 1946. | 18 | 80th | 17 | Re-elected in 1944.Ran for re-election, but withdrew from renomination due to ill health.Resigned early due to ill health. | Jan 3, 1939 – Nov 30, 1950 | Democratic | Sheridan Downey | 12 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Elected to full term in 1946. | 18 | 81st | 17 | Re-elected in 1944.Ran for re-election, but withdrew from renomination due to ill health.Resigned early due to ill health. | Jan 3, 1939 – Nov 30, 1950 | Democratic | Sheridan Downey | 12 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Elected to full term in 1946. | 18 | 81st | 17 | Appointed to finish Downey's term, having been elected to the next term. | Dec 1, 1950 – Jan 1, 1953 | Republican | Richard Nixon | 13 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Elected to full term in 1946. | 18 | 82nd | 18 | Elected in 1950.Resigned to become U.S. Vice President. | Dec 1, 1950 – Jan 1, 1953 | Republican | Richard Nixon | 13 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Elected to full term in 1946. | 18 | 82nd | 18 | Appointed to continue Nixon's term.Elected in 1954 to finish Nixon's term. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Re-elected in 1952.Retired to run for governor of California. | 19 | 83rd | 18 | Appointed to continue Nixon's term.Elected in 1954 to finish Nixon's term. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Re-elected in 1952.Retired to run for governor of California. | 19 | 84th | 18 | Appointed to continue Nixon's term.Elected in 1954 to finish Nixon's term. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 20 | William Knowland | Republican | Aug 26, 1945 – Jan 3, 1959 | Re-elected in 1952.Retired to run for governor of California. | 19 | 85th | 19 | Re-elected in 1956. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 21 | Clair Engle | Democratic | Jan 3, 1959 – Jul 30, 1964 | Elected in 1958.Died. | 20 | 86th | 19 | Re-elected in 1956. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 21 | Clair Engle | Democratic | Jan 3, 1959 – Jul 30, 1964 | Elected in 1958.Died. | 20 | 87th | 19 | Re-elected in 1956. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 21 | Clair Engle | Democratic | Jan 3, 1959 – Jul 30, 1964 | Elected in 1958.Died. | 20 | 88th | 20 | Re-elected in 1962.Lost renomination. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| Vacant | Vacant | Vacant | Jul 31, 1964 – Aug 3, 1964 | | 20 | 88th | 20 | Re-elected in 1962.Lost renomination. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 22 | Pierre Salinger | Democratic | Aug 4, 1964 – Dec 31, 1964 | Appointed to finish Engle's term.Lost election to full term, resigned early to give successor preferential seniority. | 20 | 88th | 20 | Re-elected in 1962.Lost renomination. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 23 | George Murphy | Republican | Jan 1, 1965 – Jan 1, 1971 | Appointed early to finish Engle's term, having been elected to the next term. | 20 | 88th | 20 | Re-elected in 1962.Lost renomination. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 23 | George Murphy | Republican | Jan 1, 1965 – Jan 1, 1971 | Elected in 1964.Lost re-election, resigned early to give successor preferential seniority. | 21 | 89th | 20 | Re-elected in 1962.Lost renomination. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 23 | George Murphy | Republican | Jan 1, 1965 – Jan 1, 1971 | Elected in 1964.Lost re-election, resigned early to give successor preferential seniority. | 21 | 90th | 20 | Re-elected in 1962.Lost renomination. | Jan 2, 1953 – Jan 3, 1969 | Republican | Thomas Kuchel | 14 |
| 23 | George Murphy | Republican | Jan 1, 1965 – Jan 1, 1971 | Elected in 1964.Lost re-election, resigned early to give successor preferential seniority. | 21 | 91st | 21 | Elected in 1968. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 24 | John V. Tunney | Democratic | Jan 2, 1971 – Jan 1, 1977 | Appointed to finish Murphy's term, having been elected to the next term. | 21 | 91st | 21 | Elected in 1968. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 24 | John V. Tunney | Democratic | Jan 2, 1971 – Jan 1, 1977 | Elected in 1970.Lost re-election, resigned early to give successor preferential seniority. | 22 | 92nd | 21 | Elected in 1968. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 24 | John V. Tunney | Democratic | Jan 2, 1971 – Jan 1, 1977 | Elected in 1970.Lost re-election, resigned early to give successor preferential seniority. | 22 | 93rd | 21 | Elected in 1968. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 24 | John V. Tunney | Democratic | Jan 2, 1971 – Jan 1, 1977 | Elected in 1970.Lost re-election, resigned early to give successor preferential seniority. | 22 | 94th | 22 | Re-elected in 1974. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 25 | S. I. Hayakawa | Republican | Jan 2, 1977 – Jan 3, 1983 | Appointed to finish Tunney's term, having been elected to the next term. | 22 | 94th | 22 | Re-elected in 1974. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 25 | S. I. Hayakawa | Republican | Jan 2, 1977 – Jan 3, 1983 | Elected in 1976.Retired. | 23 | 95th | 22 | Re-elected in 1974. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 25 | S. I. Hayakawa | Republican | Jan 2, 1977 – Jan 3, 1983 | Elected in 1976.Retired. | 23 | 96th | 22 | Re-elected in 1974. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 25 | S. I. Hayakawa | Republican | Jan 2, 1977 – Jan 3, 1983 | Elected in 1976.Retired. | 23 | 97th | 23 | Re-elected in 1980. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 26 | Pete Wilson | Republican | Jan 3, 1983 – Jan 7, 1991 | Elected in 1982. | 24 | 98th | 23 | Re-elected in 1980. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 26 | Pete Wilson | Republican | Jan 3, 1983 – Jan 7, 1991 | Elected in 1982. | 24 | 99th | 23 | Re-elected in 1980. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 26 | Pete Wilson | Republican | Jan 3, 1983 – Jan 7, 1991 | Elected in 1982. | 24 | 100th | 24 | Re-elected in 1986.Retired. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 26 | Pete Wilson | Republican | Jan 3, 1983 – Jan 7, 1991 | Re-elected in 1988.Resigned to become governor of California. | 25 | 101st | 24 | Re-elected in 1986.Retired. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 26 | Pete Wilson | Republican | Jan 3, 1983 – Jan 7, 1991 | Re-elected in 1988.Resigned to become governor of California. | 25 | 102nd | 24 | Re-elected in 1986.Retired. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 27 | John Seymour | Republican | Jan 7, 1991 – Nov 3, 1992 | Appointed to continue Wilson's term.Lost election to finish Wilson's term. | 25 | 102nd | 24 | Re-elected in 1986.Retired. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Elected in 1992 to finish Wilson's term. | 25 | 102nd | 24 | Re-elected in 1986.Retired. | Jan 3, 1969 – Jan 3, 1993 | Democratic | Alan Cranston | 15 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Elected in 1992 to finish Wilson's term. | 25 | 103rd | 25 | Elected in 1992. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 1994. | 26 | 104th | 25 | Elected in 1992. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 1994. | 26 | 105th | 25 | Elected in 1992. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 1994. | 26 | 106th | 26 | Re-elected in 1998. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2000. | 27 | 107th | 26 | Re-elected in 1998. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2000. | 27 | 108th | 26 | Re-elected in 1998. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2000. | 27 | 109th | 27 | Re-elected in 2004. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2006. | 28 | 110th | 27 | Re-elected in 2004. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2006. | 28 | 111th | 27 | Re-elected in 2004. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2006. | 28 | 112th | 28 | Re-elected in 2010.Retired. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2012. | 29 | 113th | 28 | Re-elected in 2010.Retired. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2012. | 29 | 114th | 28 | Re-elected in 2010.Retired. | Jan 3, 1993 – Jan 3, 2017 | Democratic | Barbara Boxer | 16 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2012. | 29 | 115th | 29 | Elected in 2016.Resigned to become U.S. Vice President. | Jan 3, 2017 – Jan 18, 2021 | Democratic | Kamala Harris | 17 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2018.Announced retirement, then died. | 30 | 116th | 29 | Elected in 2016.Resigned to become U.S. Vice President. | Jan 3, 2017 – Jan 18, 2021 | Democratic | Kamala Harris | 17 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2018.Announced retirement, then died. | 30 | 117th | 29 | Elected in 2016.Resigned to become U.S. Vice President. | Jan 3, 2017 – Jan 18, 2021 | Democratic | Kamala Harris | 17 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2018.Announced retirement, then died. | 30 | 117th | 29 | Appointed to continue Harris's term.Elected in 2022 to finish Harris's term. | Jan 18, 2021 – present | Democratic | Alex Padilla | 18 |
| 28 | Dianne Feinstein | Democratic | Nov 4, 1992 – Sep 29, 2023 | Re-elected in 2018.Announced retirement, then died. | 30 | 118th | 30 | Elected to full term in 2022. | Jan 18, 2021 – present | Democratic | Alex Padilla | 18 |
| Vacant | Vacant | Vacant | Sep 29, 2023 – Oct 1, 2023 | | 30 | 118th | 30 | Elected to full term in 2022. | Jan 18, 2021 – present | Democratic | Alex Padilla | 18 |
| 29 | Laphonza Butler | Democratic | Oct 1, 2023 – Dec 8, 2024 | Appointed to continue Feinstein's term.Retired when her successor was elected, resigned early to give successor preferential seniority. | 30 | 118th | 30 | Elected to full term in 2022. | Jan 18, 2021 – present | Democratic | Alex Padilla | 18 |
| 30 | Adam Schiff | Democratic | Dec 8, 2024 – present | Appointed early to continue Feinstein's term, having already been elected to finish the term. | 30 | 118th | 30 | Elected to full term in 2022. | Jan 18, 2021 – present | Democratic | Alex Padilla | 18 |
| 30 | Adam Schiff | Democratic | Dec 8, 2024 – present | Elected to full term in 2024. | 31 | 119th | 30 | Elected to full term in 2022. | Jan 18, 2021 – present | Democratic | Alex Padilla | 18 |
| 30 | Adam Schiff | Democratic | Dec 8, 2024 – present | Elected to full term in 2024. | 31 | 120th | 30 | Elected to full term in 2022. | Jan 18, 2021 – present | Democratic | Alex Padilla | 18 |
| 30 | Adam Schiff | Democratic | Dec 8, 2024 – present | Elected to full term in 2024. | 31 | 121st | 31 | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. |
| # | Senator | Party | Years in office | Electoral history | T | C | T | Electoral history | Years in office | Party | Senator | # |
| Class 1 | Class 1 | Class 1 | Class 1 | Class 1 | Class 1 | C | Class 3 | Class 3 | Class 3 | Class 3 | Class 3 | Class 3 |