# Liste der Mitglieder des Senats der Vereinigten Staaten

Die Liste der Mitglieder des Senats der Vereinigten Staaten umfasst alle Personen, die in den Senat der Vereinigten Staaten gewählt wurden oder als Senatoren ernannt wurden, einschließlich solcher, die nicht in den Senat aufgenommen wurden. Für Hintergrundinformationen siehe die Geschichte des Senats und die einzelnen Artikel der Senatoren. Die Parteikürzel sind ganz unten unter Parteien erklärt.

## Senatoren nach Staat

Alabama | Alaska | Arizona | Arkansas | Colorado | Connecticut | Delaware | Florida | Georgia | Hawaii | Idaho | Illinois | Indiana | Iowa | Kalifornien | 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

## Senatoren chronologisch nach Kongress

1. (1789) | 2. (1791) | 3. (1793) | 4. (1795) | 5. (1797) | 6. (1799) | 7. (1801) | 8. (1803) | 9. (1805) | 10. (1807) | 11. (1809) | 12. (1811) | 13. (1813) | 14. (1815) | 15. (1817) | 16. (1819) | 17. (1821) | 18. (1823) | 19. (1825) | 20. (1827) | 21. (1829) | 22. (1831) | 23. (1833) | 24. (1835) | 25. (1837) | 26. (1839) | 27. (1841) | 28. (1843) | 29. (1845) | 30. (1847) | 31. (1849) | 32. (1851) | 33. (1853) | 34. (1855) | 35. (1857) | 36. (1859) | 37. (1861) | 38. (1863) | 39. (1865) | 40. (1867) | 41. (1869) | 42. (1871) | 43. (1873) | 44. (1875) | 45. (1877) | 46. (1879) | 47. (1881) | 48. (1883) | 49. (1885) | 50. (1887) | 51. (1889) | 52. (1891) | 53. (1893) | 54. (1895) | 55. (1897) | 56. (1899) | 57. (1901) | 58. (1903) | 59. (1905) | 60. (1907) | 61. (1909) | 62. (1911) | 63. (1913) | 64. (1915) | 65. (1917) | 66. (1919) | 67. (1921) | 68. (1923) | 69. (1925) | 70. (1927) | 71. (1929) | 72. (1931) | 73. (1933) | 74. (1935) | 75. (1937) | 76. (1939) | 77. (1941) | 78. (1943) | 79. (1945) | 80. (1947) | 81. (1949) | 82. (1951) | 83. (1953) | 84. (1955) | 85. (1957) | 86. (1959) | 87. (1961) | 88. (1963) | 89. (1965) | 90. (1967) | 91. (1969) | 92. (1971) | 93. (1973) | 94. (1975) | 95. (1977) | 96. (1979) | 97. (1981) | 98. (1983) | 99. (1985) | 100. (1987) | 101. (1989) | 102. (1991) | 103. (1993) | 104. (1995) | 105. (1997) | 106. (1999) | 107. (2001) | 108. (2003) | 109. (2005) | 110. (2007) | 111. (2009) | 112. (2011) | 113. (2013) | 114. (2015) | 115. (2017) | 116. (2019) | 117. (2021) | 118. (2023) | 119. (2025)
Sitzverteilung im Kongress der Vereinigten Staaten (Liste)
Mitglieder des Repräsentantenhauses (Listen)
Wahlen zum Repräsentantenhaus | Wahlen zum Senat

## Senatoren nach Alphabet
### A

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Joseph Carter Abbott | 1868–1871 | North Carolina | Rep |
| James Abdnor | 1981–1987 | South Dakota | Rep |
| Hazel Abel | 1954 | Nebraska | Rep |
| James Abourezk | 1973–1979 | South Dakota | Dem |
| Spencer Abraham | 1995–2001 | Michigan | Rep |
| John Adair | 1805–1806 | Kentucky | DemRep |
| Alva B. Adams | 1923–1924 1933–1941 | Colorado | Dem |
| Brock Adams | 1987–1993 | Washington | Dem |
| John Quincy Adams | 1803–1808 | Massachusetts | Föd |
| Robert H. Adams | 1830 | Mississippi | Dem |
| Stephen Adams | 1852–1857 | Mississippi | Dem |
| George Aiken | 1941–1975 | Vermont | Rep |
| Daniel Akaka | 1990–2013 | Hawaii | Dem |
| James L. Alcorn | 1871–1877 | Mississippi | Rep |
| Nelson W. Aldrich | 1881–1911 | Rhode Island | Rep |
| Lamar Alexander | 2003–2021 | Tennessee | Rep |
| Russell A. Alger | 1902–1907 | Michigan | Rep |
| Wayne Allard | 1997–2009 | Colorado | Rep |
| J. Frank Allee | 1903–1907 | Delaware | Rep |
| George Allen | 2001–2007 | Virginia | Rep |
| Henry Justin Allen | 1929–1930 | Kansas | Rep |
| James Allen | 1969–1978 | Alabama | Dem |
| John B. Allen | 1889–1893 | Washington | Rep |
| Maryon Pittman Allen | 1978 | Alabama | Dem |
| Philip Allen | 1853–1859 | Rhode Island | Dem |
| William Allen | 1837–1849 | Ohio | Dem |
| William V. Allen | 1893–1899 1899–1901 | Nebraska | Pop |
| William B. Allison | 1873–1908 | Iowa | Rep |
| Gordon L. Allott | 1955–1973 | Colorado | Rep |
| Angela Alsobrooks | 2025– | Maryland | Dem |
| Adelbert Ames | 1870–1874 | Mississippi | Rep |
| Alexander O. Anderson | 1840–1841 | Tennessee | Dem |
| Clinton Presba Anderson | 1949–1973 | New Mexico | Dem |
| Joseph Anderson | 1797–1799 1799–1815 | Tennessee | DemRep |
| Wendell Anderson | 1976–1978 | Minnesota | DFL (Dem) |
| Charles O. Andrews | 1936–1946 | Florida | Dem |
| Mark Andrews | 1981–1987 | North Dakota | Rep |
| Levi Ankeny | 1903–1909 | Washington | Rep |
| Henry B. Anthony | 1859–1884 | Rhode Island | Rep |
| William S. Archer | 1841–1847 | Virginia | Whig |
| David H. Armstrong | 1877–1879 | Missouri | Dem |
| John Armstrong Jr. | 1801–1802 1803–1804 1804 | New York | DemRep |
| William L. Armstrong | 1979–1991 | Colorado | Rep |
| Samuel G. Arnold | 1862–1863 | Rhode Island | Rep |
| John Ashcroft | 1995–2001 | Missouri | Rep |
| Chester Ashley | 1844–1848 | Arkansas | Dem |
| Eli P. Ashmun | 1816–1818 | Massachusetts | Föd |
| Henry F. Ashurst | 1912–1941 | Arizona | Dem |
| David Rice Atchison | 1843–1855 | Missouri | Dem |
| Charles G. Atherton | 1843–1849 1853 | New Hampshire | Dem |
| Warren Austin | 1931–1946 | Vermont | Rep |
| Kelly Ayotte | 2011–2017 | New Hampshire | Rep |

### B

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Nathan L. Bachman | 1933–1937 | Tennessee | Dem |
| Augustus Octavius Bacon | 1895–1914 | Georgia | Dem |
| George Edmund Badger | 1846–1855 | North Carolina | Whig |
| Arthur P. Bagby | 1841–1848 | Alabama | Dem |
| James E. Bailey | 1877–1881 | Tennessee | Dem |
| Joseph Weldon Bailey | 1901–1913 | Texas | Dem |
| Josiah Bailey | 1931–1946 | North Carolina | Dem |
| Theodorus Bailey | 1803–1804 | New York | DemRep |
| David Baird | 1918–1919 | New Jersey | Rep |
| David Baird Jr. | 1929–1930 | New Jersey | Rep |
| David J. Baker | 1830 | Illinois | Dem |
| Edward Dickinson Baker | 1860–1861 | Oregon | Rep |
| Howard Baker | 1967–1985 | Tennessee | Rep |
| Lucien Baker | 1895–1901 | Kansas | Rep |
| Abraham Baldwin | 1799–1807 | Georgia | DemRep |
| Henry P. Baldwin | 1879–1881 | Michigan | Rep |
| Raymond E. Baldwin | 1946–1949 | Connecticut | Rep |
| Roger Sherman Baldwin | 1847–1851 | Connecticut | Whig |
| Tammy Baldwin | 2012– | Wisconsin | Dem |
| Joseph H. Ball | 1940–1942 1943–1949 | Minnesota | Rep |
| L. Heisler Ball | 1903–1905 1919–1925 | Delaware | Rep |
| John H. Bankhead | 1907–1920 | Alabama | Dem |
| John H. Bankhead Jr. | 1931–1946 | Alabama | Dem |
| Jim Banks | 2025– | Indiana | Rep |
| James Barbour | 1815–1825 | Virginia | DemRep |
| John S. Barbour | 1889–1892 | Virginia | Dem |
| William Warren Barbour | 1931–1937 1938–1943 | New Jersey | Rep |
| Thomas R. Bard | 1900–1905 | Kalifornien | Rep |
| Alben W. Barkley | 1927–1949 | Kentucky | Dem |
| Dean Barkley | 2002–2003 | Minnesota | IPM |
| Isaac D. Barnard | 1827–1831 | Pennsylvania | Dem |
| William Henry Barnum | 1876–1879 | Connecticut | Dem |
| Robert Woodward Barnwell | 1850 | South Carolina | Dem |
| Frank A. Barrett | 1953–1959 | Wyoming | Rep |
| John Barrasso | 2007– | Wyoming | Rep |
| Alexander Barrow | 1841–1846 | Louisiana | Whig |
| Middleton P. Barrow | 1882–1883 | Georgia | Dem |
| Alexander G. Barry | 1938–1939 | Oregon | Rep |
| William T. Barry | 1814–1816 | Kentucky | DemRep |
| Bob Bartlett | 1959–1968 | Alaska | Dem |
| Dewey F. Bartlett | 1973–1979 | Oklahoma | Rep |
| David Barton | 1821–1824 | Missouri | DemRep |
| David Barton | 1824–1831 | Missouri | NatRep |
| Ross Bass | 1964–1967 | Tennessee | Dem |
| Richard Bassett | 1789–1793 | Delaware | Anti Pro |
| William B. Bate | 1887–1905 | Tennessee | Dem |
| Ephraim Bateman | 1826–1829 | New Jersey | NatRep |
| Isaac C. Bates | 1841–1845 | Massachusetts | Whig |
| Martin W. Bates | 1857–1859 | Delaware | Dem |
| Max Baucus | 1978–2014 | Montana | Dem |
| James A. Bayard Jr. | 1851–1864 1867–1869 | Delaware | Dem |
| James A. Bayard Sr. | 1804–1813 | Delaware | Föd |
| Richard H. Bayard | 1836–1839 1841–1845 | Delaware | Whig |
| Thomas F. Bayard Jr. | 1922–1929 | Delaware | Dem |
| Thomas F. Bayard Sr. | 1869–1885 | Delaware | Dem |
| Birch Bayh | 1963–1981 | Indiana | Dem |
| Evan Bayh | 1998–2011 | Indiana | Dem |
| James Glenn Beall | 1953–1965 | Maryland | Rep |
| John Glenn Beall Jr. | 1971–1977 | Maryland | Rep |
| James B. Beck | 1877–1890 | Kentucky | Dem |
| J. C. W. Beckham | 1915–1921 | Kentucky | Dem |
| Asahel C. Beckwith | 1893 | Wyoming | Dem |
| Mark Begich | 2009–2015 | Alaska | Dem |
| Charles H. Bell | 1879 | New Hampshire | Rep |
| James Bell | 1855–1856 | New Hampshire | Whig |
| James Bell | 1856–1857 | New Hampshire | Rep |
| John Bell | 1847–1856 | Tennessee | Whig |
| John Bell | 1856–1859 | Tennessee | Am |
| Samuel Bell | 1823–1824 | New Hampshire | DemRep |
| Samuel Bell | 1824–1835 | New Hampshire | NatRep |
| Henry Bellmon | 1969–1981 | Oklahoma | Rep |
| George H. Bender | 1954–1957 | Ohio | Rep |
| Christie Benet | 1918 | South Carolina | Dem |
| Judah P. Benjamin | 1853–1856 | Louisiana | Whig |
| Judah P. Benjamin | 1856–1861 | Louisiana | Dem |
| Michael Bennet | 2009– | Colorado | Dem |
| Bob Bennett | 1992–2011 | Utah | Rep |
| Wallace F. Bennett | 1951–1974 | Utah | Rep |
| Alfred W. Benson | 1906–1907 | Kansas | Rep |
| Elmer Austin Benson | 1935–1936 | Minnesota | FLP |
| Thomas Hart Benton | 1821–1851 | Missouri | Dem |
| William Benton | 1949–1953 | Connecticut | Dem |
| Lloyd Bentsen | 1971–1993 | Texas | Dem |
| John M. Berrien | 1825–1829 | Georgia | Dem |
| John M. Berrien | 1841–1852 | Georgia | Whig |
| George L. Berry | 1937–1938 | Tennessee | Dem |
| James Henderson Berry | 1885–1907 | Arkansas | Dem |
| Thaddeus Betts | 1839–1840 | Connecticut | Whig |
| Albert J. Beveridge | 1899–1911 | Indiana | Rep |
| Joe Biden | 1973–2009 | Delaware | Dem |
| George M. Bibb | 1811–1814 | Kentucky | DemRep |
| George M. Bibb | 1829–1835 | Kentucky | Dem |
| William Wyatt Bibb | 1813–1816 | Georgia | DemRep |
| Alan Bible | 1954–1974 | Nevada | Dem |
| Asa Biggs | 1855–1858 | North Carolina | Dem |
| William Bigler | 1856–1861 | Pennsylvania | Dem |
| Theodore G. Bilbo | 1935–1947 | Mississippi | Dem |
| Jeff Bingaman | 1983–2013 | New Mexico | Dem |
| Hiram Bingham | 1924–1933 | Connecticut | Rep |
| Kinsley S. Bingham | 1859–1861 | Michigan | Rep |
| William Bingham | 1795–1801 | Pennsylvania | Föd |
| Hugo Black | 1927–1937 | Alabama | Dem |
| John Black | 1832–1838 | Mississippi | Dem |
| Joseph Clay Stiles Blackburn | 1885–1897 1901–1907 | Kentucky | Dem |
| Marsha Blackburn | 2019– | Tennessee | Rep |
| James G. Blaine | 1876–1881 | Maine | Rep |
| John J. Blaine | 1927–1933 | Wisconsin | Rep |
| Francis Preston Blair | 1871–1873 | Missouri | Dem |
| Henry W. Blair | 1879–1891 | New Hampshire | Rep |
| William A. Blakley | 1957 1961 | Texas | Dem |
| Newton C. Blanchard | 1894–1897 | Louisiana | Dem |
| Coleman Livingston Blease | 1925–1931 | South Carolina | Dem |
| Jesse Bledsoe | 1813–1814 | Kentucky | DemRep |
| Rufus Blodgett | 1887–1893 | New Jersey | Dem |
| Timothy Bloodworth | 1795–1801 | North Carolina | DemRep |
| William Blount | 1796–1797 | Tennessee | DemRep |
| Richard Blumenthal | 2011– | Connecticut | Dem |
| Roy Blunt | 2011–2023 | Missouri | Rep |
| Elijah Boardman | 1821–1823 | Connecticut | DemRep |
| J. Caleb Boggs | 1961–1973 | Delaware | Dem |
| Lewis V. Bogy | 1873–1877 | Missouri | Dem |
| Kit Bond | 1986–2011 | Missouri | Rep |
| Homer Bone | 1933–1944 | Washington | Dem |
| Cory Booker | 2013– | New Jersey | Dem |
| Newton Booth | 1875–1881 | Kalifornien | AMon |
| John Boozman | 2011– | Arkansas | Rep |
| William Borah | 1907–1940 | Idaho | Rep |
| Arthur I. Boreman | 1869–1875 | West Virginia | Rep |
| David L. Boren | 1979–1994 | Oklahoma | Dem |
| Solon Borland | 1848–1853 | Arkansas | Dem |
| Rudy Boschwitz | 1978–1991 | Minnesota | Rep |
| Joseph H. Bottum | 1962–1963 | South Dakota | Rep |
| Charles Bouligny | 1824–1829 | Louisiana | NatRep |
| Jonathan Bourne | 1907–1913 | Oregon | Rep |
| George S. Boutwell | 1873–1877 | Massachusetts | Rep |
| Lemuel J. Bowden | 1863–1864 | Virginia | Union |
| Thomas M. Bowen | 1883–1889 | Colorado | Rep |
| Eva Bowring | 1954 | Nebraska | Rep |
| Barbara Boxer | 1993–2017 | Kalifornien | Dem |
| James W. Bradbury | 1847–1853 | Maine | Dem |
| William Bradford | 1793–1797 | Rhode Island | Pro Föd |
| Bill Bradley | 1979–1997 | New Jersey | Dem |
| Stephen R. Bradley | 1791–1795 | Vermont | Anti |
| Stephen R. Bradley | 1801–1813 | Vermont | DemRep |
| William O’Connell Bradley | 1909–1914 | Kentucky | Rep |
| James H. Brady | 1913–1918 | Idaho | Rep |
| Nicholas F. Brady | 1982 | New Jersey | Rep |
| Thomas Bragg | 1859–1861 | North Carolina | Dem |
| Lawrence Brainerd | 1854–1855 | Vermont | Free Soil |
| John Branch | 1823–1829 | North Carolina | DemRep |
| Frank B. Brandegee | 1905–1924 | Connecticut | Rep |
| Sam G. Bratton | 1925–1933 | New Mexico | Dem |
| Carol Moseley Braun | 1993–1999 | Illinois | Dem |
| Mike Braun | 2019–2025 | Indiana | Rep |
| John Breaux | 1987–2005 | Louisiana | Dem |
| John Breckinridge | 1801–1805 | Kentucky | DemRep |
| John C. Breckinridge | 1861 | Kentucky | Dem |
| Sidney Breese | 1843–1849 | Illinois | Dem |
| Richard Brent | 1809–1814 | Virginia | DemRep |
| Daniel Brewster | 1963–1969 | Maryland | Dem |
| Owen Brewster | 1941–1952 | Maine | Rep |
| Calvin S. Brice | 1891–1897 | Ohio | Dem |
| John W. Bricker | 1947–1959 | Ohio | Rep |
| Styles Bridges | 1937–1961 | New Hampshire | Rep |
| Frank O. Briggs | 1907–1913 | New Jersey | Rep |
| Frank P. Briggs | 1945–1947 | Missouri | Dem |
| Jesse D. Bright | 1845–1862 | Indiana | Dem |
| Joseph L. Bristow | 1909–1915 | Kansas | Rep |
| Katie Britt | 2023– | Alabama | Rep |
| Bill Brock | 1971–1977 | Tennessee | Rep |
| William Emerson Brock | 1929–1931 | Tennessee | Dem |
| David C. Broderick | 1857–1859 | Kalifornien | Dem |
| Richard Brodhead | 1851–1857 | Pennsylvania | Dem |
| Edward Brooke | 1967–1979 | Massachusetts | Rep |
| Walker Brooke | 1852–1853 | Mississippi | Whig |
| Smith W. Brookhart | 1922–1926 1927–1933 | Iowa | Rep |
| Charles W. Brooks | 1940–1949 | Illinois | Rep |
| J. Melville Broughton | 1948–1949 | North Carolina | Dem |
| Edwin S. Broussard | 1921–1933 | Louisiana | Dem |
| Robert F. Broussard | 1915–1918 | Louisiana | Dem |
| Albert G. Brown | 1854–1861 | Mississippi | Dem |
| Arthur Brown | 1896–1897 | Utah | Rep |
| Bedford Brown | 1829–1840 | North Carolina | Dem |
| B. Gratz Brown | 1863–1867 | Missouri | Rep |
| Ernest S. Brown | 1954 | Nevada | Rep |
| Ethan Allen Brown | 1822–1824 | Ohio | DemRep |
| Ethan Allen Brown | 1824–1825 | Ohio | NatRep |
| Fred H. Brown | 1933–1939 | New Hampshire | Dem |
| Hank Brown | 1991–1997 | Colorado | Rep |
| James Brown | 1813–1817 1819–1823 | Louisiana | DemRep |
| John Brown | 1792–1805 | Kentucky | Anti DemRep |
| Joseph E. Brown | 1880–1891 | Georgia | Dem |
| Norris Brown | 1907–1913 | Nebraska | Rep |
| Prentiss M. Brown | 1936–1943 | Michigan | Dem |
| Scott Brown | 2010–2013 | Massachusetts | Rep |
| Sherrod Brown | 2007–2025 | Ohio | Dem |
| Sam Brownback | 1998–2011 | Kansas | Dem |
| Orville Hickman Browning | 1861–1863 | Illinois | Rep |
| William Gannaway Brownlow | 1869–1875 | Tennessee | Rep |
| Jim Broyhill | 1986 | North Carolina | Rep |
| Blanche Bruce | 1875–1881 | Mississippi | Rep |
| William Cabell Bruce | 1923–1929 | Maryland | Dem |
| Clarence Norman Brunsdale | 1959–1960 | North Dakota | Rep |
| Nathan P. Bryan | 1911–1917 | Florida | Dem |
| Richard Bryan | 1989–2001 | Nevada | Dem |
| William James Bryan | 1907–1908 | Florida | Dem |
| James Buchanan | 1834–1845 | Pennsylvania | Dem |
| C. Douglass Buck | 1943–1949 | Delaware | Rep |
| Charles R. Buckalew | 1863–1869 | Pennsylvania | Dem |
| William Alfred Buckingham | 1869–1875 | Connecticut | Rep |
| James L. Buckley | 1971–1977 | New York | Con |
| Alexander Buckner | 1831–1833 | Missouri | Dem |
| Ted Budd | 2023– | North Carolina | Rep |
| Morgan Bulkeley | 1905–1911 | Connecticut | Rep |
| Robert J. Bulkley | 1930–1939 | Ohio | Dem |
| William Bellinger Bulloch | 1813 | Georgia | DemRep |
| William J. Bulow | 1931–1943 | South Dakota | Dem |
| Dale Bumpers | 1975–1999 | Arkansas | Dem |
| Berkeley L. Bunker | 1940–1942 | Nevada | Dem |
| Jim Bunning | 1998–2011 | Kentucky | Rep |
| Thomas G. Burch | 1946 | Virginia | Dem |
| Jocelyn Burdick | 1992 | North Dakota | Dem |
| Quentin N. Burdick | 1960–1992 | North Dakota | Dem |
| Edward R. Burke | 1935–1941 | Nebraska | Dem |
| Thomas A. Burke | 1953–1954 | Ohio | Dem |
| Elmer Burkett | 1905–1911 | Nebraska | Rep |
| Edwin C. Burleigh | 1913–1916 | Maine | Rep |
| Jacob Burnet | 1828–1831 | Ohio | NatRep |
| Thomas G. Burch | 1946 | Virginia | Dem |
| Henry E. Burnham | 1901–1913 | New Hampshire | Rep |
| Conrad Burns | 1989–2007 | Montana | Rep |
| Ambrose Burnside | 1875–1881 | Rhode Island | Rep |
| Aaron Burr | 1791–1797 | New York | Anti DemRep |
| Richard Burr | 2005–2023 | North Carolina | Rep |
| James Burrill | 1817–1820 | Rhode Island | Föd |
| Roland Burris | 2009–2010 | Illinois | Dem |
| Julius C. Burrows | 1895–1911 | Michigan | Rep |
| Holm O. Bursum | 1921–1925 | New Mexico | Rep |
| Harold Hitz Burton | 1941–1945 | Ohio | Rep |
| Joseph R. Burton | 1901–1906 | Kansas | Rep |
| Theodore E. Burton | 1909–1915 1928–1929 | Ohio | Rep |
| Prescott Bush | 1953–1963 | Connecticut | Rep |
| Harlan J. Bushfield | 1943–1948 | South Dakota | Rep |
| Vera C. Bushfield | 1948 | South Dakota | Rep |
| Andrew Butler | 1846–1857 | South Carolina | Dem |
| Hugh A. Butler | 1941–1954 | Nebraska | Rep |
| John Marshall Butler | 1951–1963 | Maryland | Rep |
| Laphonza Butler | 2023–2025 | Kalifornien | Dem |
| Marion Butler | 1895–1901 | North Carolina | Pop |
| Matthew Butler | 1877–1895 | South Carolina | Dem |
| Pierce Butler | 1789–1795 | South Carolina | Pro Föd |
| Pierce Butler | 1795–1796 1802–1804 | South Carolina | DemRep |
| William M. Butler | 1924–1926 | Massachusetts | Rep |
| Harry F. Byrd Jr. | 1965–1970 | Virginia | Dem |
| Harry F. Byrd Jr. | 1970–1983 | Virginia | Unabh |
| Harry F. Byrd Sr. | 1933–1965 | Virginia | Dem |
| Robert Byrd | 1959–2010 | West Virginia | Dem |
| James F. Byrnes | 1931–1941 | South Carolina | Dem |

### C

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| George Cabot | 1791–1796 | Massachusetts | Pro Föd |
| Donelson Caffery | 1892–1901 | Louisiana | Dem |
| Harry P. Cain | 1946–1953 | Washington | Rep |
| William M. Calder | 1917–1923 | New York | Rep |
| Alexander Caldwell | 1871–1873 | Kansas | Rep |
| John C. Calhoun | 1832–1843 | South Carolina | Null |
| John C. Calhoun | 1845–1850 | South Carolina | Dem |
| Wilkinson Call | 1879–1897 | Florida | Dem |
| Johnson N. Camden | 1881–1887 1893–1895 | West Virginia | Dem |
| Johnson N. Camden Jr. | 1914–1915 | Kentucky | Dem |
| Angus Cameron | 1875–1881 1881–1885 | Wisconsin | Rep |
| J. Donald Cameron | 1877–1897 | Pennsylvania | Rep |
| Ralph H. Cameron | 1921–1927 | Arizona | Rep |
| Simon Cameron | 1845–1849 | Pennsylvania | Dem |
| Simon Cameron | 1857–1861 1867–1877 | Pennsylvania | Rep |
| Alexander Campbell | 1809–1813 | Ohio | DemRep |
| Ben Nighthorse Campbell | 1993–1995 | Colorado | Dem |
| Ben Nighthorse Campbell | 1995–2005 | Colorado | Rep |
| George W. Campbell | 1811–1814 1815–1818 | Tennessee | DemRep |
| Frank J. Cannon | 1896–1899 | Utah | SilRep |
| Howard Cannon | 1959–1983 | Nevada | Dem |
| Maria Cantwell | 2001– | Washington | Dem |
| Homer E. Capehart | 1945–1963 | Indiana | Rep |
| Allen T. Caperton | 1875–1876 | West Virginia | Dem |
| Shelley Moore Capito | 2015– | West Virginia | Rep |
| Arthur Capper | 1919–1949 | Kansas | Rep |
| Hattie Caraway | 1931–1945 | Arkansas | Dem |
| Thaddeus H. Caraway | 1921–1931 | Arkansas | Dem |
| Ben Cardin | 2007–2025 | Maryland | Dem |
| Joseph M. Carey | 1890–1895 | Wyoming | Rep |
| Robert D. Carey | 1930–1937 | Wyoming | Rep |
| John S. Carlile | 1861–1865 | Virginia | Union |
| John G. Carlisle | 1890–1893 | Kentucky | Dem |
| Frank Carlson | 1950–1969 | Kansas | Rep |
| Edward W. Carmack | 1901–1907 | Tennessee | Dem |
| Jean Carnahan | 2001–2002 | Missouri | Dem |
| Matthew H. Carpenter | 1869–1875 1879–1881 | Wisconsin | Rep |
| Tom Carper | 2001–2025 | Delaware | Dem |
| Charles Carroll | 1789–1792 | Maryland | Pro |
| John A. Carroll | 1957–1963 | Colorado | Dem |
| Thomas H. Carter | 1895–1901 1905–1911 | Montana | Rep |
| Edward P. Carville | 1945–1947 | Nevada | Dem |
| Clifford P. Case | 1955–1979 | New Jersey | Rep |
| Francis H. Case | 1951–1962 | South Dakota | Rep |
| Bob Casey | 2007– | Pennsylvania | Dem |
| Lyman R. Casey | 1889–1893 | North Dakota | Rep |
| Lewis Cass | 1845–1848 1849–1857 | Michigan | Dem |
| Eugene Casserly | 1869–1873 | Kalifornien | Dem |
| Bill Cassidy | 2015– | Louisiana | Rep |
| Charles W. Cathcart | 1852–1853 | Indiana | Dem |
| Thomas B. Catron | 1912–1917 | New Mexico | Rep |
| Alexander G. Cattell | 1866–1871 | New Jersey | Rep |
| Jonathan Chace | 1885–1889 | Rhode Island | Rep |
| John Chafee | 1977–1999 | Rhode Island | Rep |
| Lincoln Chafee | 1999–2007 | Rhode Island | Rep |
| Jerome B. Chaffee | 1876–1879 | Colorado | Rep |
| Joseph W. Chalmers | 1845–1847 | Mississippi | Dem |
| George Earle Chamberlain | 1909–1921 | Oregon | Dem |
| Ezekiel F. Chambers | 1826–1834 | Maryland | NatRep |
| Henry H. Chambers | 1825–1826 | Alabama | DemRep |
| Saxby Chambliss | 2003–2015 | Georgia | Rep |
| Christopher G. Champlin | 1809–1811 | Rhode Island | Föd |
| Happy Chandler | 1939–1949 | Kentucky | Dem |
| John Chandler | 1820–1829 | Maine | DemRep |
| William E. Chandler | 1887–1889 1889–1901 | New Hampshire | Rep |
| Zachariah Chandler | 1857–1875 1879 | Michigan | Rep |
| Virgil Chapman | 1949–1951 | Kentucky | Dem |
| Dudley Chase | 1813–1817 | Vermont | DemRep |
| Dudley Chase | 1825–1831 | Vermont | NatRep |
| Salmon P. Chase | 1849–1855 | Ohio | Free Soil |
| Salmon P. Chase | 1861 | Ohio | Rep |
| Robert M. Charlton | 1852–1853 | Georgia | Dem |
| Dennis Chavez | 1935–1962 | New Mexico | Dem |
| Person Colby Cheney | 1886–1887 | New Hampshire | Rep |
| James Chesnut | 1858–1860 | South Carolina | Dem |
| Jeffrey Chiesa | 2013 | New Jersey | Rep |
| George M. Chilcott | 1882–1883 | Colorado | Rep |
| Lawton Chiles | 1971–1989 | Florida | Dem |
| Horace Chilton | 1891–1892 1895–1901 | Texas | Dem |
| William E. Chilton | 1911–1917 | West Virginia | Dem |
| Nathaniel Chipman | 1797–1803 | Vermont | Föd |
| Rufus Choate | 1841–1845 | Massachusetts | Whig |
| Isaac P. Christiancy | 1875–1879 | Michigan | Rep |
| Frank Church | 1957–1981 | Idaho | Dem |
| Joseph Cilley | 1846–1847 | New Hampshire | Dem |
| William C. C. Claiborne | 1817 | Louisiana | DemRep |
| Moses E. Clapp | 1901–1917 | Minnesota | Rep |
| Bennett Champ Clark | 1933–1945 | Missouri | Dem |
| Clarence D. Clark | 1895–1917 | Wyoming | Rep |
| Daniel Clark | 1857–1866 | New Hampshire | Rep |
| David Worth Clark | 1939–1945 | Idaho | Dem |
| Joseph S. Clark | 1957–1969 | Pennsylvania | Dem |
| Dick Clark | 1973–1979 | Iowa | Dem |
| William A. Clark | 1899–1900 1901–1907 | Montana | Dem |
| James Paul Clarke | 1903–1916 | Arkansas | Dem |
| John Hopkins Clarke | 1847–1853 | Rhode Island | Whig |
| Alexander S. Clay | 1897–1910 | Georgia | Dem |
| Clement Claiborne Clay | 1853–1861 | Alabama | Dem |
| Clement Comer Clay | 1837–1841 | Alabama | Dem |
| Henry Clay | 1806–1807 1810–1811 | Kentucky | DemRep |
| Henry Clay | 1831–1832 | Kentucky | NatRep |
| Henry Clay | 1832–1842 1849–1852 | Kentucky | Whig |
| John M. Clayton | 1829–1836 1845–1849 1853–1856 | Delaware | Whig |
| Joshua Clayton | 1798 | Delaware | Föd |
| Powell Clayton | 1871–1877 | Alabama | Rep |
| Thomas Clayton | 1824–1827 | Delaware | NatRep |
| Thomas Clayton | 1837–1847 | Delaware | Whig |
| Max Cleland | 1997–2003 | Georgia | Dem |
| Jeremiah Clemens | 1849–1853 | Alabama | Dem |
| Earle C. Clements | 1950–1957 | Kentucky | Dem |
| Thomas Lanier Clingman | 1858–1861 | North Carolina | Dem |
| DeWitt Clinton | 1802–1803 | New York | DemRep |
| Hillary Clinton | 2001–2009 | New York | Dem |
| Dan Coats | 1989–1999 2011–2017 | Indiana | Rep |
| Thomas W. Cobb | 1824–1828 | Georgia | DemRep |
| Tom Coburn | 2005–2015 | Oklahoma | Rep |
| Thad Cochran | 1978–2018 | Mississippi | Rep |
| William Cocke | 1796–1797 | Tennessee | DemRep |
| Francis Cockrell | 1875–1905 | Missouri | Dem |
| John S. Cohen | 1932–1933 | Georgia | Dem |
| William Cohen | 1979–1997 | Maine | Rep |
| Richard Coke | 1877–1895 | Texas | Dem |
| Cornelius Cole | 1867–1873 | Kalifornien | Rep |
| Norm Coleman | 2003–2009 | Minnesota | Rep |
| John E. Colhoun | 1801–1802 | South Carolina | DemRep |
| Jacob Collamer | 1855–1865 | Vermont | Rep |
| Susan Collins | 1997– | Maine | Rep |
| Alfred H. Colquitt | 1883–1894 | Georgia | Dem |
| Walter T. Colquitt | 1843–1848 | Georgia | Dem |
| LeBaron B. Colt | 1913–1924 | Rhode Island | Rep |
| Joseph P. Comegys | 1856–1857 | Delaware | Whig |
| B. B. Comer | 1920 | Alabama | Dem |
| John Condit | 1809–1817 | New Jersey | DemRep |
| Omar D. Conger | 1881–1887 | Michigan | Rep |
| Roscoe Conkling | 1867–1881 | New York | Rep |
| Tom Connally | 1929–1953 | Texas | Dem |
| John Conness | 1863–1869 | Kalifornien | Rep |
| Simon B. Conover | 1873–1879 | Florida | Rep |
| Charles Magill Conrad | 1842–1843 | Louisiana | Whig |
| Kent Conrad | 1987–2013 | North Dakota | Dem |
| Marlow Cook | 1968–1974 | Kentucky | Rep |
| Marcus A. Coolidge | 1931–1937 | Massachusetts | Dem |
| Chris Coons | 2011– | Delaware | Dem |
| Henry Cooper | 1871–1877 | Tennessee | Dem |
| James Cooper | 1849–1855 | Pennsylvania | Whig |
| John Sherman Cooper | 1946–1949 1952–1955 1956–1973 | Kentucky | Rep |
| Royal S. Copeland | 1923–1938 | New York | Dem |
| Henry W. Corbett | 1867–1873 | Oregon | Rep |
| Guy Cordon | 1944–1955 | Oregon | Rep |
| John Cornyn | 2003– | Texas | Rep |
| Catherine Cortez Masto | 2017– | Nevada | Dem |
| Thomas Corwin | 1845–1850 | Ohio | Whig |
| Jon Corzine | 2001–2006 | New Jersey | Dem |
| Edward P. Costigan | 1931–1937 | Colorado | Dem |
| Norris Cotton | 1954–1974 1975 | New Hampshire | Rep |
| Tom Cotton | 2015– | Arkansas | Rep |
| James J. Couzens | 1922–1936 | Michigan | Rep |
| Paul Coverdell | 1993–2000 | Georgia | Rep |
| Edgar Cowan | 1861–1867 | Pennsylvania | Rep |
| Mo Cowan | 2014 | Massachusetts | Dem |
| Samuel C. Crafts | 1842–1843 | Vermont | Whig |
| Aaron H. Cragin | 1865–1877 | New Hampshire | Rep |
| Larry Craig | 1991–2009 | Idaho | Rep |
| Kevin Cramer | 2019– | North Dakota | Rep |
| Winthrop M. Crane | 1904–1913 | Massachusetts | Rep |
| Alan Cranston | 1969–1993 | Kalifornien | Dem |
| Mike Crapo | 1999– | Idaho | Rep |
| Coe I. Crawford | 1909–1915 | South Dakota | Rep |
| William H. Crawford | 1807–1813 | Georgia | DemRep |
| John Creswell | 1865–1867 | Maryland | Rep |
| Edward D. Crippa | 1954 | Wyoming | Rep |
| John J. Crittenden | 1817–1819 | Kentucky | DemRep |
| John J. Crittenden | 1835–1841 1842–1848 | Kentucky | Whig |
| John J. Crittenden | 1855–1861 | Kentucky | Am |
| William E. Crow | 1921–1922 | Pennsylvania | Rep |
| Robert Crozier | 1873–1874 | Kansas | Rep |
| Ted Cruz | 2013– | Texas | Rep |
| Charles Allen Culberson | 1899–1923 | Texas | Dem |
| Shelby Moore Cullom | 1883–1913 | Illinois | Rep |
| John Culver | 1975–1981 | Iowa | Dem |
| Albert B. Cummins | 1908–1926 | Iowa | Rep |
| Carl Curtis | 1955–1979 | Nebraska | Rep |
| Charles Curtis | 1907–1913 1915–1929 | Kansas | Rep |
| John R. Curtis | 2025– | Utah | Rep |
| Alfred Cuthbert | 1835–1843 | Georgia | Dem |
| Bronson M. Cutting | 1927–1928 1929–1935 | New Mexico | Rep |
| Charles Cutts | 1810–1813 | New Hampshire | DemRep |

### D

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Al D’Amato | 1981–1999 | New York | Rep |
| David Daggett | 1813–1819 | Connecticut | Föd |
| Steve Daines | 2015– | Montana | Rep |
| Porter H. Dale | 1923–1933 | Vermont | Rep |
| George M. Dallas | 1831–1833 | Pennsylvania | Dem |
| Tristram Dalton | 1789–1791 | Massachusetts | Pro |
| Judah Dana | 1836–1837 | Maine | Dem |
| Samuel W. Dana | 1810–1821 | Connecticut | Föd |
| John A. Danaher | 1939–1945 | Connecticut | Rep |
| John Danforth | 1977–1995 | Missouri | Rep |
| Charles E. Daniel | 1954 | South Carolina | Dem |
| John W. Daniel | 1887–1910 | Virginia | Dem |
| Price Daniel | 1953–1957 | Texas | Dem |
| Harry Darby | 1949–1950 | Kansas | Rep |
| Tom Daschle | 1987–2005 | South Dakota | Dem |
| Franklin Davenport | 1798–1799 | New Jersey | Föd |
| Cushman Kellogg Davis | 1887–1900 | Minnesota | Rep |
| David Davis | 1877–1883 | Illinois | Unabh |
| Garrett Davis | 1861–1872 | Kentucky | Dem |
| Henry G. Davis | 1871–1883 | West Virginia | Dem |
| James J. Davis | 1930–1945 | Pennsylvania | Rep |
| Jeff Davis | 1907–1913 | Arkansas | Dem |
| Jefferson Davis | 1847–1851 1857–1861 | Mississippi | Dem |
| John Davis | 1835–1836 | Massachusetts | NatRep |
| John Davis | 1836–1841 1845–1853 | Massachusetts | Whig |
| Henry L. Dawes | 1875–1893 | Massachusetts | Rep |
| William Crosby Dawson | 1849–1855 | Georgia | Whig |
| Jonathan Dayton | 1799–1805 | New Jersey | Föd |
| Mark Dayton | 2001–2007 | Minnesota | DFL (Dem) |
| William L. Dayton | 1842–1851 | New Jersey | Whig |
| William F. De Saussure | 1852–1853 | South Carolina | Dem |
| James De Wolf | 1821–1824 | Rhode Island | DemRep |
| James De Wolf | 1824–1825 | Rhode Island | Dem |
| William Joseph Deboe | 1897–1903 | Kentucky | Rep |
| Dennis DeConcini | 1977–1995 | Arizona | Dem |
| Jim DeMint | 2005–2013 | South Carolina | Rep |
| Charles S. Deneen | 1925–1931 | Illinois | Rep |
| George R. Dennis | 1873–1879 | Maryland | Dem |
| Jeremiah Denton | 1981–1987 | Alabama | Rep |
| Chauncey Depew | 1899–1911 | New York | Rep |
| Jean Noël Destréhan | 1812 | Louisiana | DemRep |
| Mike DeWine | 1995–2007 | Ohio | Rep |
| Samuel Dexter | 1799–1800 | Massachusetts | Föd |
| Nathaniel B. Dial | 1919–1925 | South Carolina | Dem |
| Charles W. F. Dick | 1904–1911 | Ohio | Rep |
| Mahlon Dickerson | 1817–1824 | New Jersey | DemRep |
| Mahlon Dickerson | 1824–1833 | New Jersey | Dem |
| Daniel S. Dickinson | 1844–1851 | New York | Dem |
| Lester J. Dickinson | 1931–1937 | Iowa | Rep |
| Philemon Dickinson | 1790–1793 | New Jersey | Pro |
| William H. Dieterich | 1933–1939 | Illinois | Dem |
| Charles Henry Dietrich | 1901–1905 | Nebraska | Rep |
| Clarence Dill | 1923–1935 | Washington | Dem |
| William P. Dillingham | 1900–1923 | Vermont | Rep |
| Everett Dirksen | 1951–1969 | Illinois | Rep |
| John Adams Dix | 1845–1849 | New York | Dem |
| Alan J. Dixon | 1981–1993 | Illinois | Dem |
| Archibald Dixon | 1852–1855 | Kentucky | Whig |
| James Dixon | 1857–1869 | Connecticut | Rep |
| Joseph M. Dixon | 1907–1912 | Montana | Rep |
| Joseph M. Dixon | 1912–1913 | Montana | Prog |
| Nathan F. Dixon I | 1839–1842 | Rhode Island | Whig |
| Nathan F. Dixon III | 1889–1895 | Rhode Island | Rep |
| Chris Dodd | 1980–2011 | Connecticut | Dem |
| Thomas J. Dodd | 1959–1971 | Connecticut | Dem |
| Augustus C. Dodge | 1846–1855 | Iowa | Dem |
| Henry Dodge | 1848–1857 | Wisconsin | Dem |
| Bob Dole | 1969–1996 | Kansas | Rep |
| Elizabeth Dole | 2003–2009 | North Carolina | Rep |
| Jonathan P. Dolliver | 1900–1910 | Iowa | Rep |
| Joseph N. Dolph | 1883–1895 | Oregon | Rep |
| Pete Domenici | 1973–2009 | New Mexico | Rep |
| Peter H. Dominick | 1963–1975 | Colorado | Rep |
| A. Victor Donahey | 1935–1941 | Ohio | Dem |
| Forrest C. Donnell | 1945–1951 | Missouri | Rep |
| James R. Doolittle | 1857–1869 | Wisconsin | Rep |
| Byron Dorgan | 1992–2011 | North Dakota | Dem |
| Stephen Wallace Dorsey | 1873–1879 | Arkansas | Rep |
| Paul Douglas | 1949–1967 | Illinois | Dem |
| Stephen A. Douglas | 1847–1861 | Illinois | Dem |
| Sheridan Downey | 1939–1950 | Kalifornien | Dem |
| Solomon W. Downs | 1847–1853 | Louisiana | Dem |
| Wall Doxey | 1941–1943 | Mississippi | Dem |
| Charles D. Drake | 1867–1870 | Missouri | Rep |
| Irving W. Drew | 1918 | New Hampshire | Rep |
| John F. Dryden | 1902–1907 | New Jersey | Rep |
| Henry A. du Pont | 1906–1917 | Delaware | Rep |
| T. Coleman du Pont | 1921–1922 1925–1928 | Delaware | Rep |
| Fred Dubois | 1891–1896 | Idaho | Rep |
| Fred Dubois | 1896–1897 | Idaho | SilRep |
| Fred Dubois | 1901–1907 | Idaho | Dem |
| Tammy Duckworth | 2017– | Illinois | Dem |
| Charles E. Dudley | 1829–1833 | New York | Dem |
| James H. Duff | 1951–1957 | Pennsylvania | Rep |
| F. Ryan Duffy | 1933–1939 | Wisconsin | Dem |
| John Foster Dulles | 1949–1950 | New York | Rep |
| Dick Durbin | 1997– | Illinois | Dem |
| David Durenberger | 1978–1995 | Minnesota | Rep |
| Charles Durkee | 1855–1861 | Wisconsin | Rep |
| John A. Durkin | 1975–1980 | New Hampshire | Dem |
| Henry Dworshak | 1946–1949 1949–1962 | Idaho | Rep |

### E

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Thomas Eagleton | 1969–1987 | Missouri | Dem |
| Joseph H. Earle | 1897 | South Carolina | Dem |
| John Porter East | 1981–1986 | North Carolina | Rep |
| James Eastland | 1941 1943–1979 | Mississippi | Dem |
| John Eaton | 1818–1821 | Tennessee | DemRep |
| John Eaton | 1821–1829 | Tennessee | Dem |
| William W. Eaton | 1875–1881 | Connecticut | Dem |
| Zales Ecton | 1947–1953 | Montana | Rep |
| Walter Evans Edge | 1919–1929 | New Jersey | Rep |
| Alonzo J. Edgerton | 1881 | Minnesota | Rep |
| J. Howard Edmondson | 1963–1964 | Oklahoma | Dem |
| George F. Edmunds | 1866–1891 | Vermont | Rep |
| Edward I. Edwards | 1923–1929 | New Jersey | Dem |
| Elaine S. Edwards | 1972 | Louisiana | Dem |
| Henry W. Edwards | 1823–1827 | Connecticut | DemRep |
| John Edwards | 1792–1795 | Kentucky | Anti |
| John Edwards | 1999–2005 | North Carolina | Dem |
| Ninian Edwards | 1818–1824 | Illinois | DemRep |
| Davis Elkins | 1911 1919–1925 | West Virginia | Rep |
| Stephen Benton Elkins | 1895–1911 | West Virginia | Rep |
| Allen J. Ellender | 1937–1972 | Louisiana | Dem |
| Christopher Ellery | 1801–1805 | Rhode Island | DemRep |
| John Elliott | 1819–1825 | Georgia | DemRep |
| Powhatan Ellis | 1825–1826 1827–1832 | Mississippi | Dem |
| Oliver Ellsworth | 1789–1796 | Connecticut | Pro Föd |
| Jonathan Elmer | 1789–1791 | New Jersey | Pro |
| Franklin H. Elmore | 1850 | South Carolina | Dem |
| Clair Engle | 1959–1964 | Kalifornien | Dem |
| James E. English | 1875–1876 | Connecticut | Dem |
| John Ensign | 2001–2011 | Nevada | Rep |
| Mike Enzi | 1996–2021 | Wyoming | Rep |
| John Wayles Eppes | 1817–1819 | Virginia | DemRep |
| John E. Erickson | 1933–1934 | Montana | Dem |
| Joni Ernst | 2015– | Iowa | Rep |
| Richard P. Ernst | 1921–1927 | Kentucky | Rep |
| Sam Ervin | 1954–1974 | North Carolina | Dem |
| James B. Eustis | 1876–1879 1885–1891 | Louisiana | Dem |
| Daniel J. Evans | 1983–1989 | Washington | Rep |
| George Evans | 1841–1847 | Maine | Whig |
| Josiah J. Evans | 1853–1858 | South Carolina | Dem |
| William M. Evarts | 1885–1891 | New York | Rep |
| Edward Everett | 1853–1854 | Massachusetts | Whig |
| Thomas Ewing | 1831–1837 | Ohio | NatRep |
| Thomas Ewing | 1850–1851 | Ohio | Whig |
| William Lee D. Ewing | 1835–1837 | Illinois | Dem |
| J. James Exon | 1979–1997 | Nebraska | Dem |

### F

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| James Graham Fair | 1881–1887 | Nevada | Dem |
| Charles W. Fairbanks | 1897–1905 | Indiana | Rep |
| Lauch Faircloth | 1993–1999 | North Carolina | Rep |
| John Fairfield | 1843–1847 | Maine | Dem |
| Albert B. Fall | 1912–1921 | New Mexico | Rep |
| Paul Fannin | 1965–1977 | Arizona | Rep |
| James T. Farley | 1879–1885 | Kalifornien | Dem |
| Charles B. Farwell | 1887–1891 | Illinois | Rep |
| Nathan A. Farwell | 1864–1865 | Maine | Rep |
| Charles James Faulkner | 1887–1899 | West Virginia | Dem |
| William C. Feazel | 1948 | Louisiana | Dem |
| Russ Feingold | 1992–2011 | Wisconsin | Dem |
| Dianne Feinstein | 1993–2023 | Kalifornien | Dem |
| Alpheus Felch | 1847–1853 | Michigan | Dem |
| Charles N. Felton | 1891–1893 | Kalifornien | Rep |
| Rebecca Latimer Felton | 1922 | Georgia | Dem |
| James Fenner | 1805–1807 | Rhode Island | DemRep |
| Reuben Fenton | 1869–1872 | New York | Rep |
| Reuben Fenton | 1872–1875 | New York | LibRep |
| Homer S. Ferguson | 1943–1955 | Michigan | Rep |
| Bert M. Fernald | 1916–1926 | Maine | Rep |
| Woodbridge Nathan Ferris | 1923–1928 | Michigan | Dem |
| Orris S. Ferry | 1867–1872 | Connecticut | Rep |
| Orris S. Ferry | 1872–1875 | Connecticut | LibRep |
| Orris S. Ferry | 1875 | Connecticut | Rep |
| Thomas W. Ferry | 1871–1883 | Michigan | Rep |
| Simeon D. Fess | 1923–1935 | Ohio | Rep |
| William P. Fessenden | 1854–1856 | Maine | Whig |
| William P. Fessenden | 1856–1864 1865–1869 | Maine | Rep |
| John Fetterman | 2023– | Pennsylvania | Dem |
| William Few | 1789–1793 | Georgia | Anti DemRep |
| Richard Stockton Field | 1862–1863 | New Jersey | Rep |
| William Findlay | 1821–1824 | Pennsylvania | DemRep |
| William Findlay | 1824–1827 | Pennsylvania | Dem |
| Jesse J. Finley | 1887 | Florida | Dem |
| Hamilton Fish | 1851–1856 | New York | Whig |
| Hamilton Fish | 1856–1857 | New York | Rep |
| Deb Fischer | 2013– | Nebraska | Rep |
| James Fisk | 1817–1818 | Vermont | DemRep |
| Graham N. Fitch | 1857–1861 | Indiana | Dem |
| Peter G. Fitzgerald | 1999–2005 | Illinois | Rep |
| Thomas Fitzgerald | 1848–1849 | Michigan | Dem |
| Benjamin Fitzpatrick | 1848–1849 1853–1855 1855–1861 | Alabama | Dem |
| James W. Flanagan | 1870–1875 | Texas | Rep |
| Ralph Flanders | 1946–1959 | Vermont | Rep |
| Duncan U. Fletcher | 1909–1936 | Florida | Dem |
| Frank P. Flint | 1905–1911 | Kalifornien | Rep |
| George G. Fogg | 1866–1867 | New Hampshire | Rep |
| Hiram Fong | 1959–1977 | Hawaii | Rep |
| Samuel A. Foot | 1827–1833 | Connecticut | NatRep |
| Solomon Foot | 1851–1856 | Vermont | Whig |
| Solomon Foot | 1856–1866 | Vermont | Rep |
| Henry S. Foote | 1847–1852 | Mississippi | Dem |
| Joseph B. Foraker | 1897–1909 | Ohio | Rep |
| Wendell H. Ford | 1975–1999 | Kentucky | Dem |
| John Forsyth | 1818–1819 | Georgia | DemRep |
| John Forsyth | 1829–1834 | Georgia | Dem |
| Addison G. Foster | 1899–1905 | Washington | Rep |
| Dwight Foster | 1800–1803 | Massachusetts | Föd |
| Ephraim H. Foster | 1838–1839 1843–1845 | Tennessee | Whig |
| Henry A. Foster | 1844–1845 | New York | Dem |
| Lafayette S. Foster | 1855–1856 | Connecticut | Whig |
| Lafayette S. Foster | 1856–1867 | Connecticut | Rep |
| Murphy J. Foster | 1901–1913 | Louisiana | Dem |
| Theodore Foster | 1790–1803 | Rhode Island | Pro Föd |
| Joseph S. Fowler | 1866–1871 | Tennessee | Union Rep |
| Wyche Fowler | 1987–1993 | Georgia | Dem |
| Sheila Frahm | 1996 | Kansas | Rep |
| Joseph I. France | 1917–1923 | Maryland | Rep |
| John Brown Francis | 1844–1845 | Rhode Island | Law |
| Al Franken | 2009–2018 | Minnesota | DFL (Dem) |
| Jesse Franklin | 1799–1805 1807–1813 | North Carolina | DemRep |
| James B. Frazier | 1905–1911 | Tennessee | Dem |
| Lynn Frazier | 1923–1941 | North Dakota | Rep |
| J. Allen Frear | 1949–1961 | Delaware | Dem |
| Frederick Frelinghuysen | 1793–1796 | New Jersey | Pro Föd |
| Frederick Theodore Frelinghuysen | 1866–1869 1871–1877 | New Jersey | Rep |
| Joseph Sherman Frelinghuysen | 1917–1923 | New Jersey | Rep |
| Theodore Frelinghuysen | 1829–1835 | New Jersey | NatRep |
| John C. Frémont | 1850–1851 | Kalifornien | Rep |
| Bill Frist | 1995–2007 | Tennessee | Rep |
| Eligius Fromentin | 1813–1819 | Louisiana | DemRep |
| William P. Frye | 1881–1911 | Maine | Rep |
| J. William Fulbright | 1945–1975 | Arkansas | Dem |
| Charles William Fulton | 1903–1909 | Oregon | Rep |
| William S. Fulton | 1836–1844 | Arkansas | Dem |

### G

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| John Gaillard | 1804–1826 | South Carolina | DemRep |
| Albert Gallatin | 1793–1794 | Pennsylvania | DemRep |
| Ruben Gallego | 2025– | Arizona | Dem |
| Jacob Harold Gallinger | 1891–1918 | New Hampshire | Rep |
| Robert J. Gamble | 1901–1913 | South Dakota | Rep |
| David H. Gambrell | 1971–1972 | Georgia | Dem |
| Cory Gardner | 2015–2021 | Colorado | Rep |
| Obadiah Gardner | 1911–1913 | Maine | Dem |
| Augustus Hill Garland | 1836–1844 | Arkansas | Dem |
| Jake Garn | 1974–1993 | Utah | Rep |
| Frank B. Gary | 1908–1909 | South Carolina | Dem |
| Edward James Gay | 1918–1921 | Louisiana | Dem |
| Charles Gayarré | (1835) | Louisiana | Dem |
| John H. Gear | 1895–1900 | Iowa | Rep |
| John M. Gearin | 1905–1907 | Oregon | Dem |
| James Z. George | 1881–1897 | Mississippi | Dem |
| Walter F. George | 1923–1957 | Georgia | Dem |
| Obadiah German | 1809–1815 | New York | DemRep |
| Peter G. Gerry | 1917–1929 1935–1947 | Rhode Island | Dem |
| Henry S. Geyer | 1851–1857 | Missouri | Whig |
| Charles Hopper Gibson | 1891–1897 | Maryland | Dem |
| Ernest Gibson Jr. | 1940–1941 | Vermont | Rep |
| Ernest Gibson Sr. | 1933–1940 | Vermont | Rep |
| Paris Gibson | 1901–1905 | Montana | Dem |
| Randall L. Gibson | 1883–1892 | Louisiana | Dem |
| Abijah Gilbert | 1869–1875 | Florida | Rep |
| William Branch Giles | 1804 1804–1815 | Virginia | DemRep |
| Frederick H. Gillett | 1925–1931 | Massachusetts | Rep |
| Francis Gillette | 1854–1855 | Connecticut | Free Soil |
| Guy Gillette | 1936–1945 1949–1955 | Iowa | Dem |
| Kirsten Gillibrand | 2009– | New York | Dem |
| Nicholas Gilman | 1805–1814 | New Hampshire | DemRep |
| Carter Glass | 1920–1946 | Virginia | Dem |
| John Glenn | 1974–1999 | Ohio | Dem |
| Otis F. Glenn | 1928–1933 | Illinois | Rep |
| Guy D. Goff | 1925–1931 | West Virginia | Rep |
| Nathan Goff | 1913–1919 | West Virginia | Rep |
| Phillips Lee Goldsborough | 1929–1935 | Maryland | Rep |
| Robert Henry Goldsborough | 1814–1817 | Maryland | Föd |
| George Goldthwaite | 1871–1877 | Alabama | Dem |
| Barry Goldwater | 1953–1965 1969–1987 | Arizona | Rep |
| Charles Goodell | 1968–1971 | New York | Rep |
| Benjamin Goodhue | 1796–1800 | Massachusetts | Föd |
| Frank R. Gooding | 1921–1928 | Idaho | Rep |
| Chauncey Goodrich | 1807–1813 | Connecticut | Föd |
| Carte Goodwin | 2010 | West Virginia | Dem |
| James Gordon | 1909–1910 | Mississippi | Dem |
| John Brown Gordon | 1873–1880 1891–1897 | Georgia | Dem |
| Al Gore | 1985–1993 | Tennessee | Dem |
| Albert Gore Sr. | 1953–1971 | Tennessee | Dem |
| Christopher Gore | 1813–1816 | Massachusetts | Föd |
| Thomas Gore | 1907–1921 1931–1937 | Oklahoma | Dem |
| Arthur Pue Gorman | 1881–1899 1903–1906 | Maryland | Dem |
| Slade Gorton | 1981–1987 1989–2001 | Washington | Rep |
| Charles C. Gossett | 1945–1946 | Idaho | Dem |
| Arthur R. Gould | 1926–1931 | Maine | Rep |
| Bob Graham | 1987–2005 | Florida | Dem |
| Frank Porter Graham | 1949–1950 | North Carolina | Dem |
| Lindsey Graham | 2003– | South Carolina | Rep |
| William Alexander Graham | 1840–1843 | North Carolina | Whig |
| Phil Gramm | 1985–2002 | Texas | Rep |
| Elijah S. Grammer | 1932–1933 | Washington | Rep |
| Rod Grams | 1995–2001 | Minnesota | Rep |
| Chuck Grassley | 1981– | Iowa | Rep |
| Mike Gravel | 1969–1981 | Alaska | Dem |
| Dixie Bibb Graves | 1937–1938 | Alabama | Dem |
| George Gray | 1885–1899 | Delaware | Dem |
| William Grayson | 1789–1790 | Virginia | Anti |
| James S. Green | 1857–1861 | Missouri | Dem |
| Theodore F. Green | 1937–1961 | Rhode Island | Dem |
| Albert C. Greene | 1845–1851 | Rhode Island | Whig |
| Frank L. Greene | 1923–1930 | Vermont | Rep |
| Ray Greene | 1791–1801 | Rhode Island | Föd |
| Andrew Gregg | 1807–1813 | Pennsylvania | DemRep |
| Judd Gregg | 1992–2011 | New Hampshire | Rep |
| Robert P. Griffin | 1966–1979 | Michigan | Rep |
| Dwight Griswold | 1952–1954 | Nebraska | Rep |
| Stanley Griswold | 1809 | Ohio | DemRep |
| James W. Grimes | 1859–1869 | Iowa | Rep |
| Asle Gronna | 1911–1921 | North Dakota | Rep |
| James Black Groome | 1879–1885 | Maryland | Dem |
| La Fayette Grover | 1877–1883 | Oregon | Dem |
| Ernest Gruening | 1959–1969 | Alaska | Dem |
| Felix Grundy | 1829–1838 | Tennessee | Dem |
| Joseph R. Grundy | 1929–1930 | Pennsylvania | Rep |
| Joseph F. Guffey | 1935–1947 | Pennsylvania | Dem |
| Simon Guggenheim | 1907–1913 | Colorado | Rep |
| Walter Guion | 1918 | Louisiana | Dem |
| James Gunn | 1789–1801 | Georgia | Anti Föd |
| Edward Gurney | 1969–1974 | Florida | Rep |
| John Chandler Gurney | 1939–1951 | South Dakota | Rep |
| James Guthrie | 1865–1868 | Kentucky | Dem |
| William M. Gwin | 1850–1855 1857–1861 | Kalifornien | Dem |

### H

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Kay Hagan | 2009–2015 | North Carolina | Dem |
| Chuck Hagel | 1997–2009 | Nebraska | Rep |
| John S. Hager | 1873–1875 | Kalifornien | Dem |
| Bill Hagerty | 2021– | Tennessee | Rep |
| Eugene Hale | 1881–1911 | Maine | Rep |
| Frederick Hale | 1917–1941 | Maine | Rep |
| John P. Hale | 1847–1848 | New Hampshire | Dem |
| John P. Hale | 1848–1853 | New Hampshire | Free Soil |
| Wilton E. Hall | 1944–1945 | South Carolina | Dem |
| Morgan C. Hamilton | 1870–1877 | Texas | Rep |
| William Thomas Hamilton | 1869–1875 | Maryland | Dem |
| Hannibal Hamlin | 1848–1857 | Maine | Dem |
| Hannibal Hamlin | 1857–1861 1869–1881 | Maine | Rep |
| James Henry Hammond | 1857–1860 | South Carolina | Dem |
| Wade Hampton | 1879–1891 | South Carolina | Dem |
| Mark Hanna | 1897–1904 | Ohio | Rep |
| Robert Hanna | 1831–1832 | Indiana | DemRep |
| Edward A. Hannegan | 1843–1849 | Indiana | Dem |
| Henry C. Hansbrough | 1891–1909 | North Dakota | Rep |
| Clifford P. Hansen | 1967–1978 | Wyoming | Rep |
| Alexander Contee Hanson | 1816–1819 | Maryland | Föd |
| Martin D. Hardin | 1816–1817 | Kentucky | Föd |
| Benjamin F. Harding | 1862–1865 | Oregon | Dem |
| Warren G. Harding | 1915–1921 | Ohio | Rep |
| Thomas W. Hardwick | 1914–1919 | Georgia | Dem |
| Tom Harkin | 1985–2015 | Iowa | Dem |
| James Harlan | 1853–1857 1857–1865 | Iowa | Free Soil Rep |
| Robert Goodloe Harper | 1816 | Maryland | Föd |
| William Harper | 1826 | South Carolina | Dem |
| John W. Harreld | 1921–1927 | Oklahoma | Rep |
| Fred R. Harris | 1964–1973 | Oklahoma | Dem |
| Ira Harris | 1861–1867 | New York | Rep |
| Isham G. Harris | 1877–1897 | Tennessee | Dem |
| John S. Harris | 1868–1871 | Louisiana | Rep |
| Kamala Harris | 2017–2021 | Kalifornien | Dem |
| William A. Harris | 1897–1903 | Kansas | Pop |
| William J. Harris | 1919–1932 | Georgia | Dem |
| Benjamin Harrison | 1881–1888 | Indiana | Rep |
| Pat Harrison | 1918–1941 | Mississippi | Dem |
| William Henry Harrison | 1825–1828 | Ohio | NatRep |
| Gary Hart | 1975–1987 | Colorado | Dem |
| Philip Hart | 1959–1977 | Michigan | Dem |
| Thomas C. Hart | 1945–1946 | Connecticut | Rep |
| Vance Hartke | 1959–1977 | Indiana | Dem |
| James M. Harvey | 1874–1877 | Kansas | Rep |
| Floyd K. Haskell | 1973–1979 | Colorado | Dem |
| Maggie Hassan | 2017– | New Hampshire | Dem |
| Daniel O. Hastings | 1928–1937 | Delaware | Rep |
| Carl Hatch | 1933–1949 | New Mexico | Dem |
| Henry D. Hatfield | 1929–1935 | West Virginia | Rep |
| Mark Hatfield | 1967–1997 | Oregon | Rep |
| Paul G. Hatfield | 1978 | Montana | Dem |
| William Hathaway | 1973–1979 | Maine | Dem |
| Henry P. Haun | 1859–1860 | Kalifornien | Dem |
| Harry B. Hawes | 1921–1926 | Missouri | Dem |
| Albert W. Hawkes | 1943–1949 | New Jersey | Rep |
| Benjamin Hawkins | 1789–1791 | North Carolina | Pro |
| Benjamin Hawkins | 1791–1795 | North Carolina | Anti |
| Paula Hawkins | 1981–1987 | Florida | Rep |
| Joseph Roswell Hawley | 1881–1905 | Connecticut | Rep |
| Josh Hawley | 2019– | Missouri | Rep |
| S. I. Hayakawa | 1977–1983 | Kalifornien | Rep |
| Carl Hayden | 1927–1969 | Arizona | Dem |
| Arthur P. Hayne | 1858 | South Carolina | Dem |
| Robert Young Hayne | 1823–1832 | South Carolina | DemRep Dem Null |
| Monroe Hayward | 1899 | Nebraska | Rep |
| William Henry Haywood | 1843–1846 | North Carolina | Dem |
| George Hearst | 1886 1887–1891 | Kalifornien | Dem |
| Felix Hebert | 1929–1935 | Rhode Island | Rep |
| Chic Hecht | 1983–1989 | Nevada | Rep |
| James Thomas Heflin | 1920–1931 | Alabama | Dem |
| Howell Heflin | 1979–1997 | Alabama | Dem |
| Henry John Heinz | 1977–1991 | Pennsylvania | Rep |
| John Netherland Heiskell | 1913 | Alabama | Dem |
| Martin Heinrich | 2013– | New Mexico | Dem |
| Henry Heitfeld | 1897–1903 | Idaho | Pop |
| Jesse Helms | 1973–2003 | North Carolina | Rep |
| George Helmy | 2024 | New Jersey | Dem |
| James A. Hemenway | 1905–1909 | Indiana | Rep |
| John Hemphill | 1859–1861 | Texas | Dem |
| Charles B. Henderson | 1918–1921 | Nevada | Dem |
| James Pinckney Henderson | 1857–1858 | Texas | Dem |
| John Henderson | 1839–1845 | Mississippi | Whig |
| John B. Henderson | 1862–1869 | Missouri | Union Rep |
| Thomas A. Hendricks | 1863–1869 | Indiana | Dem |
| William Hendricks | 1825–1837 | Indiana | NatRep |
| Robert C. Hendrickson | 1949–1955 | New Jersey | Rep |
| Thomas C. Hennings | 1951–1960 | Missouri | Dem |
| John Henry | 1789–1797 | Maryland | Pro Föd |
| Frank Hereford | 1877–1881 | West Virginia | Dem |
| Clyde L. Herring | 1937–1943 | Iowa | Dem |
| Weldon B. Heyburn | 1903–1912 | Idaho | Rep |
| Bourke B. Hickenlooper | 1945–1969 | Iowa | Rep |
| John Hickenlooper | 2021– | Colorado | Dem |
| John J. Hickey | 1961–1962 | Wyoming | Dem |
| Thomas Holliday Hicks | 1862–1865 | Maryland | Rep |
| Anthony C. Higgins | 1889–1895 | Delaware | Rep |
| Benjamin Harvey Hill | 1877–1882 | Georgia | Dem |
| David B. Hill | 1892–1897 | New York | Dem |
| Isaac Hill | 1831–1836 | New Hampshire | Dem |
| J. Lister Hill | 1938–1969 | Alabama | Dem |
| Joshua Hill | 1871–1873 | Georgia | Rep |
| Nathaniel P. Hill | 1879–1885 | Colorado | Rep |
| William Luther Hill | 1936 | Florida | Dem |
| James Hillhouse | 1796–1810 | Connecticut | Föd |
| William Hindman | 1800–1801 | Maryland | Föd |
| Mazie Hirono | 2013– | Hawaii | Dem |
| Frank Hiscock | 1887–1893 | New York | Rep |
| Gilbert Hitchcock | 1911–1923 | Nebraska | Dem |
| Herbert E. Hitchcock | 1936–1938 | South Dakota | Dem |
| Phineas Hitchcock | 1871–1877 | Nebraska | Rep |
| George Frisbie Hoar | 1877–1904 | Massachusetts | Rep |
| John Sloss Hobart | 1798 | New York | Föd |
| John D. Hoblitzell | 1958 | West Virginia | Rep |
| Kaneaster Hodges | 1977–1979 | Arkansas | Dem |
| John Hoeven | 2011– | North Dakota | Rep |
| Clyde R. Hoey | 1945–1954 | North Carolina | Dem |
| Spessard Holland | 1946–1971 | Florida | Dem |
| Fritz Hollings | 1966–2005 | South Carolina | Dem |
| Henry F. Hollis | 1913–1919 | New Hampshire | Dem |
| Rufus C. Holman | 1939–1945 | Oregon | Rep |
| David Holmes | 1820–1825 | Mississippi | DemRep |
| John Holmes | 1820–1827 | Maine | DemRep |
| John Holmes | 1829–1833 | Maine | NatRep |
| Rush D. Holt Sr. | 1935–1941 | West Virginia | Dem |
| Albert J. Hopkins | 1903–1909 | Illinois | Rep |
| Outerbridge Horsey | 1810–1821 | Delaware | Föd |
| Andrew Jackson Houston | 1941 | Texas | Dem |
| George S. Houston | 1879 | Alabama | Dem |
| Sam Houston | 1846–1855 | Texas | Dem |
| Sam Houston | 1855–1856 | Texas | Am |
| Sam Houston | 1856–1859 | Texas | Unabh |
| Guy V. Howard | 1936–1937 | Minnesota | Rep |
| Jacob M. Howard | 1862–1871 | Michigan | Rep |
| John Eager Howard | 1796–1893 | Maryland | Föd |
| Timothy O. Howe | 1861–1879 | Wisconsin | Rep |
| James B. Howell | 1870–1871 | Iowa | Rep |
| Jeremiah B. Howell | 1811–1817 | Rhode Island | DemRep |
| Robert B. Howell | 1923–1933 | Nebraska | Rep |
| Benjamin Howland | 1804–1809 | Rhode Island | DemRep |
| Roman Hruska | 1954–1976 | Nebraska | Rep |
| Henry Hubbard | 1835–1841 | New Hampshire | Dem |
| Walter Dee Huddleston | 1973–1985 | Kentucky | Dem |
| James W. Huffman | 1945–1946 | Ohio | Dem |
| Daniel Elliott Huger | 1843–1845 | South Carolina | Dem |
| Charles J. Hughes | 1909–1911 | Colorado | Dem |
| Harold Hughes | 1969–1973 | Arizona | Dem |
| James H. Hughes | 1937–1943 | Delaware | Dem |
| William Hughes | 1913–1918 | New Jersey | Dem |
| Cordell Hull | 1931–1933 | Tennessee | Dem |
| Gordon J. Humphrey | 1979–1990 | New Hampshire | Rep |
| Hubert Humphrey | 1949–1964 1971–1978 | Minnesota | DFL (Dem) |
| Muriel Humphrey | 1978 | Minnesota | DFL (Dem) |
| Robert Humphreys | 1956 | Kentucky | Dem |
| Lester C. Hunt | 1949–1954 | Wyoming | Dem |
| John Hunter | 1796–1798 | South Carolina | DemRep |
| Richard C. Hunter | 1934–1935 | Nebraska | Dem |
| Robert Mercer Taliaferro Hunter | 1847–1861 | Virginia | Dem |
| William Hunter | 1811–1821 | Rhode Island | Föd |
| Jabez W. Huntington | 1840–1847 | Connecticut | Whig |
| Eppa Hunton | 1892–1895 | Virginia | Dem |
| Jon Husted | 2025- | Ohio | Rep |
| Paul O. Husting | 1915–1917 | Wisconsin | Dem |
| Tim Hutchinson | 1997–2003 | Arkansas | Rep |
| Kay Bailey Hutchison | 1993–2013 | Texas | Rep |
| Cindy Hyde-Smith | 2018– | Mississippi | Rep |

### I

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| John James Ingalls | 1873–1891 | Kansas | Rep |
| Jim Inhofe | 1994–2023 | Oklahoma | Rep |
| Daniel Inouye | 1963–2012 | Hawaii | Dem |
| John L. M. Irby | 1891–1897 | South Carolina | Dem |
| James Iredell | 1828–1831 | North Carolina | Dem |
| Johnny Isakson | 2005–2019 | Georgia | Rep |
| Alfred Iverson | 1855–1861 | Georgia | Dem |
| Irving Ives | 1947–1959 | New York | Rep |
| Ralph Izard | 1789–1795 | South Carolina | Pro |

### J

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Andrew Jackson | 1797–1798 1823–1825 | Tennessee | DemRep |
| Henry M. Jackson | 1953–1983 | Washington | Dem |
| Howell Edmunds Jackson | 1881–1886 | Tennessee | Dem |
| James Jackson | 1793–1795 | Georgia | Anti |
| James Jackson | 1801–1806 | Georgia | DemRep |
| Samuel D. Jackson | 1944 | Indiana | Dem |
| William Purnell Jackson | 1912–1914 | Maryland | Rep |
| Charles Tillinghast James | 1851–1857 | Rhode Island | Dem |
| Ollie Murray James | 1913–1918 | Kentucky | Dem |
| Spencer Jarnagin | 1843–1847 | Tennessee | Whig |
| Thomas Jordan Jarvis | 1894–1895 | North Carolina | Dem |
| Jacob K. Javits | 1957–1981 | New York | Rep |
| Jim Jeffords | 1989–2001 | Vermont | Rep |
| Jim Jeffords | 2001–2007 | Vermont | Unabh |
| William E. Jenner | 1944–1945 1947–1959 | Indiana | Rep |
| Benning W. Jenness | 1845–1846 | New Hampshire | Dem |
| Roger Jepsen | 1979–1985 | Iowa | Rep |
| Daniel T. Jewett | 1870–1871 | Missouri | Rep |
| Mike Johanns | 2009–2015 | Nebraska | Rep |
| Andrew Johnson | 1857–1862 1875 | Tennessee | Dem |
| Charles Fletcher Johnson | 1911–1917 | Maine | Dem |
| Edwin C. Johnson | 1937–1955 | Colorado | Dem |
| Edwin S. Johnson | 1915–1921 | South Dakota | Dem |
| Henry Johnson | 1818–1823 | Louisiana | DemRep |
| Henry Johnson | 1823–1824 | Louisiana | NatRep |
| Henry Johnson | 1844–1849 | Louisiana | Whig |
| Herschel Vespasian Johnson | 1848–1849 | Georgia | Dem |
| Hiram Johnson | 1917–1945 | Kalifornien | Rep |
| Lyndon B. Johnson | 1949–1961 | Texas | Dem |
| Magnus Johnson | 1923–1925 | Minnesota | FLP |
| Martin N. Johnson | 1909 | North Dakota | Rep |
| Reverdy Johnson | 1845–1849 | Maryland | Whig |
| Reverdy Johnson | 1863–1868 | Maryland | Dem |
| Richard Mentor Johnson | 1819–1824 | Kentucky | DemRep |
| Richard Mentor Johnson | 1824–1829 | Kentucky | Dem |
| Robert Ward Johnson | 1853–1861 | Arkansas | Dem |
| Ron Johnson | 2011– | Wisconsin | Rep |
| Tim Johnson | 1997–2015 | South Dakota | Dem |
| Waldo P. Johnson | 1861–1862 | Missouri | Dem |
| William Samuel Johnson | 1789–1791 | Connecticut | Föd |
| Bennett Johnston | 1973–1997 | Louisiana | Dem |
| John W. Johnston | 1870–1883 | Virginia | Dem |
| Joseph F. Johnston | 1907–1913 | Alabama | Dem |
| Josiah S. Johnston | 1824–1833 | Louisiana | NatRep |
| Olin D. Johnston | 1945–1965 | South Carolina | Dem |
| Rienzi Melville Johnston | 1913 | Texas | Dem |
| Samuel Johnston | 1789–1793 | North Carolina | Pro |
| Benjamin F. Jonas | 1879–1885 | Louisiana | Dem |
| Andrieus A. Jones | 1917–1927 | New Mexico | Dem |
| Charles W. Jones | 1875–1887 | Florida | Dem |
| Doug Jones | 2019–2021 | Alabama | Dem |
| George Jones | 1807 | Georgia | DemRep |
| George W. Jones | 1848–1859 | Iowa | Dem |
| James C. Jones | 1851–1856 | Tennessee | Whig |
| James C. Jones | 1856–1857 | Tennessee | Dem |
| James Kimbrough Jones | 1885–1903 | Arkansas | Dem |
| John P. Jones | 1873–1895 | Nevada | Rep |
| John P. Jones | 1895–1901 | Nevada | Silver |
| John P. Jones | 1901–1903 | Nevada | Rep |
| Wesley Livsey Jones | 1909–1932 | Washington | Rep |
| B. Everett Jordan | 1958–1973 | North Carolina | Dem |
| Leonard B. Jordan | 1962–1973 | Idaho | Rep |
| Jim Justice | 2025– | West Virginia | Rep |

### K

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Tim Kaine | 2013– | Virginia | Dem |
| Elias Kane | 1825–1835 | Illinois | Dem |
| David Karnes | 1987–1988 | Nebraska | Rep |
| Nancy Landon Kassebaum | 1979–1997 | Kansas | Rep |
| Bob Kasten | 1981–1993 | Wisconsin | Rep |
| Ted Kaufman | 2009–2010 | Delaware | Dem |
| William M. Kavanaugh | 1913 | Arkansas | Dem |
| Hamilton Fish Kean | 1929–1935 | New Jersey | Rep |
| John Kean | 1899–1911 | New Jersey | Rep |
| Thomas Kearns | 1901–1905 | Utah | Rep |
| Kenneth Keating | 1959–1965 | New York | Rep |
| Estes Kefauver | 1949–1963 | Tennessee | Dem |
| Frank B. Kellogg | 1965–1968 | Minnesota | Rep |
| William P. Kellogg | 1868–1872 1877–1883 | Louisiana | Rep |
| James K. Kelly | 1871–1877 | Oregon | Dem |
| Mark Kelly | 2021– | Arizona | Dem |
| William Kelly | 1822–1825 | Alabama | DemRep |
| James P. Kem | 1947–1953 | Missouri | Rep |
| Dirk Kempthorne | 1993–1999 | Idaho | Rep |
| John B. Kendrick | 1917–1933 | Wyoming | Dem |
| John E. Kenna | 1883–1893 | West Virginia | Dem |
| Anthony Kennedy | 1857–1863 | Maryland | Am |
| Edward Kennedy | 1962–2009 | Massachusetts | Dem |
| John F. Kennedy | 1953–1961 | Massachusetts | Dem |
| John Neely Kennedy | 2017– | Louisiana | Rep |
| Richard R. Kenney | 1897–1901 | Delaware | Dem |
| Robert F. Kennedy | 1965–1968 | New York | Dem |
| Joseph Kent | 1833–1837 | Maryland | NatRep Whig |
| William S. Kenyon | 1911–1922 | Iowa | Rep |
| John W. Kern | 1911–1917 | Indiana | Dem |
| Francis Kernan | 1875–1881 | New York | Dem |
| John Leeds Kerr | 1841–1843 | Maryland | Whig |
| Joseph Kerr | 1814–1815 | Ohio | DemRep |
| Robert S. Kerr | 1949–1963 | Oklahoma | Dem |
| Bob Kerrey | 1989–2001 | Nebraska | Dem |
| John Kerry | 1985–2013 | Massachusetts | Dem |
| David M. Key | 1875–1877 | Tennessee | Dem |
| Henry W. Keyes | 1919–1937 | New Hampshire | Rep |
| Harley M. Kilgore | 1941–1956 | West Virginia | Dem |
| Andy Kim | 2024– | New Jersey | Dem |
| Angus King | 2013– | Maine | Unabh (Dem) |
| John Pendleton King | 1833–1837 | Georgia | Dem |
| Preston King | 1857–1863 | New York | Rep |
| Rufus King | 1789–1796 | New York | Pro Föd |
| Rufus King | 1813–1819 | New York | Föd |
| William H. King | 1917–1941 | Utah | Dem |
| William R. King | 1819–1829 | Alabama | DemRep |
| William R. King | 1829–1844 | Alabama | Dem |
| William F. Kirby | 1916–1921 | Arkansas | Dem |
| Mark Kirk | 2011–2017 | Illinois | Rep |
| Paul G. Kirk | 2009–2010 | Massachusetts | Dem |
| Samuel J. Kirkwood | 1855–1865 | Iowa | Rep |
| Aaron Kitchell | 1805–1809 | New Jersey | DemRep |
| Alfred B. Kittredge | 1901–1909 | South Dakota | Rep |
| Amy Klobuchar | 2007– | Minnesota | DFL (Dem) |
| Nehemiah R. Knight | 1821–1829 | Rhode Island | DemRep |
| Nehemiah R. Knight | 1829–1835 | Rhode Island | NatRep |
| Nehemiah R. Knight | 1835–1841 | Rhode Island | Whig |
| William F. Knowland | 1945–1959 | Kalifornien | Rep |
| Philander C. Knox | 1904–1909 1913–1921 | Pennsylvania | Rep |
| Herb Kohl | 1989–2013 | Wisconsin | Dem |
| Bob Krueger | 1993 | Texas | Dem |
| Thomas Kuchel | 1953–1969 | Kalifornien | Rep |
| Jon Kyl | 1995–2013 | Arizona | Rep |
| James H. Kyle | 1891–1893 | South Dakota | Unabh (Dem) |
| James H. Kyle | 1893–1897 | South Dakota | Pop |
| James H. Kyle | 1897–1901 | South Dakota | Rep |

### L

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Robert M. La Follette Jr. | 1925–1934 | Wisconsin | Rep |
| Robert M. La Follette Jr. | 1934–1947 | Wisconsin | Prog |
| Robert M. La Follette Sr. | 1906–1924 | Wisconsin | Rep |
| Robert M. La Follette Sr. | 1924–1925 | Wisconsin | Prog |
| Abner Lacock | 1813–1819 | Pennsylvania | DemRep |
| Edwin F. Ladd | 1921–1925 | North Dakota | Rep |
| William R. Laird | 1956 | West Virginia | Dem |
| Lucius Quintus Cincinnatus Lamar | 1877–1885 | Mississippi | Dem |
| John Lambert | 1809–1815 | New Jersey | DemRep |
| Mary Landrieu | 1997–2015 | Louisiana | Dem |
| Harry Lane | 1913–1917 | Oregon | Dem |
| Henry Smith Lane | 1861–1867 | Indiana | Rep |
| James Henry Lane | 1861–1866 | Kansas | Rep |
| Joseph Lane | 1859–1861 | Oregon | Dem |
| John Langdon | 1789–1801 | New Hampshire | Pro Anti DemRep |
| William Langer | 1941–1959 | North Dakota | Rep |
| James Lankford | 2015– | Oklahoma | Rep |
| James Lanman | 1819–1825 | Connecticut | DemRep |
| Elbridge G. Lapham | 1881–1885 | New York | Rep |
| Octaviano Ambrosio Larrazolo | 1929 | New Mexico | Rep |
| Milton Latham | 1860–1863 | Kalifornien | Dem |
| Asbury Latimer | 1903–1908 | South Carolina | Dem |
| Henry Latimer | 1795–1801 | Delaware | Föd |
| John Laurance | 1796–1800 | New York | Föd |
| Frank Lausche | 1957–1969 | Ohio | Dem |
| Frank Lautenberg | 1982–2001 2002–2013 | New Jersey | Dem |
| Paul Laxalt | 1975–1987 | Nevada | Rep |
| Luke Lea | 1911–1917 | Tennessee | Dem |
| Edward L. Leahy | 1949–1950 | Rhode Island | Dem |
| Patrick Leahy | 1975–2023 | Vermont | Dem |
| Walter Leake | 1817–1820 | Mississippi | DemRep |
| Blair Lee | 1914–1917 | Maryland | Dem |
| Joshua B. Lee | 1937–1943 | Oklahoma | Dem |
| Mike Lee | 2011– | Utah | Rep |
| Richard Henry Lee | 1789–1792 | Virginia | Anti |
| Herbert H. Lehman | 1950–1957 | New York | Dem |
| Michael Leib | 1809–1814 | Pennsylvania | DemRep |
| Benjamin W. Leigh | 1834–1836 | Virginia | NatRep Whig |
| George LeMieux | 2009–2011 | Florida | Rep |
| Alton Lennon | 1953–1954 | North Carolina | Dem |
| Irvine Lenroot | 1918–1927 | Wisconsin | Rep |
| Carl Levin | 1979–2015 | Michigan | Dem |
| Dixon Hall Lewis | 1844–1848 | Alabama | Dem |
| J. Hamilton Lewis | 1913–1919 1931–1939 | Illinois | Dem |
| John F. Lewis | 1870–1875 | Virginia | Rep |
| Joe Lieberman | 1989–2006 | Connecticut | Dem |
| Joe Lieberman | 2006–2013 | Connecticut | Unabh (Dem) |
| Blanche Lincoln | 1998–2011 | Arkansas | Dem |
| William Lindsay | 1893–1901 | Kentucky | Dem |
| Lewis F. Linn | 1833–1843 | Missouri | Dem |
| Henry F. Lippitt | 1911–1917 | Rhode Island | Rep |
| Samuel Livermore | 1793–1801 | New Hampshire | Pro Föd |
| Edward Livingston | 1829–1831 | Louisiana | DemRep |
| Edward Lloyd | 1819–1826 | Maryland | DemRep |
| James Lloyd | 1797–1800 | Maryland | Föd |
| James Lloyd | 1808–1813 1822–1826 | Massachusetts | Föd |
| Cyrus Locher | 1928 | Ohio | Dem |
| Francis Locke | 1814–1815 | North Carolina | DemRep |
| Henry Cabot Lodge | 1893–1924 | Massachusetts | Rep |
| Henry Cabot Lodge Jr. | 1937–1944 1947–1953 | Massachusetts | Rep |
| Kelly Loeffler | 2020–2021 | Georgia | Rep |
| Scott Loftin | 1936 | Florida | Dem |
| George Logan | 1801–1807 | Pennsylvania | DemRep |
| John A. Logan | 1871–1877 | Illinois | Rep |
| M. M. Logan | 1931–1939 | Kentucky | Dem |
| William Logan | 1819–1820 | Kentucky | DemRep |
| Augustine Lonergan | 1933–1939 | Connecticut | Dem |
| Chester I. Long | 1903–1909 | Kansas | Rep |
| Edward V. Long | 1960–1968 | Missouri | Dem |
| Huey Long | 1932–1935 | Louisiana | Dem |
| Oren E. Long | 1959–1963 | Hawaii | Dem |
| Rose McConnell Long | 1936–1937 | Louisiana | Dem |
| Russell B. Long | 1948–1987 | Louisiana | Dem |
| William Lorimer | 1909–1912 | Illinois | Rep |
| Trent Lott | 1989–2007 | Mississippi | Rep |
| Walter Lowrie | 1819–1825 | Pennsylvania | DemRep |
| Scott W. Lucas | 1939–1951 | Illinois | Dem |
| Richard Lugar | 1977–2013 | Indiana | Rep |
| Ben R. Luján | 2021– | New Mexico | Dem |
| Cynthia Lummis | 2021– | Wyoming | Rep |
| Alva M. Lumpkin | 1941 | South Carolina | Dem |
| Wilson Lumpkin | 1837–1841 | Georgia | Dem |
| Ernest Lundeen | 1937–1940 | Minnesota | FLP |
| Hall S. Lusk | 1960 | Oregon | Dem |
| Lucius Lyon | 1837–1839 | Michigan | Dem |

### M

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Willis Benson Machen | 1872–1873 | Kentucky | Dem |
| Connie Mack | 1989–2001 | Florida | Rep |
| Samuel Maclay | 1803–1809 | Pennsylvania | DemRep |
| William Maclay | 1789–1791 | Pennsylvania | Anti |
| Nathaniel Macon | 1815–1824 | North Carolina | DemRep |
| Nathaniel Macon | 1824–1828 | North Carolina | Demen |
| Warren G. Magnuson | 1944–1981 | Washington | Dem |
| Allan B. Magruder | 1812–1813 | Louisiana | DemRep |
| William Mahone | 1881–1887 | Virginia | Readj |
| Francis Malbone | 1809 | Rhode Island | Föd |
| Stephen Mallory | 1851–1861 | Florida | Dem |
| Stephen Mallory II | 1897–1907 | Florida | Dem |
| George W. Malone | 1947–1959 | Nevada | Rep |
| Francis T. Maloney | 1935–1945 | Connecticut | Dem |
| Joe Manchin | 2011–2025 | West Virginia | Dem |
| Charles F. Manderson | 1883–1895 | Nebraska | Rep |
| Willie Person Mangum | 1831–1834 | North Carolina | Dem |
| Willie Person Mangum | 1834–1836 | North Carolina | NatRep |
| Willie Person Mangum | 1840–1853 | North Carolina | Whig |
| Mike Mansfield | 1953–1977 | Montana | Dem |
| Lee Mantle | 1895–1899 | Montana | Rep |
| William L. Marcy | 1831–1833 | New York | Dem |
| Ed Markey | 2013– | Massachusetts | Dem |
| William Marks | 1825–1831 | Pennsylvania | NatRep |
| Humphrey Marshall | 1795–1801 | Kentucky | Föd |
| Roger Marshall | 2021– | Kansas | Rep |
| Gilman Marston | 1889 | New Hampshire | Rep |
| Alexander Martin | 1793–1799 | North Carolina | Anti DemRep |
| Edward Martin | 1947–1859 | Pennsylvania | Rep |
| George B. Martin | 1918–1919 | Kentucky | Dem |
| John Martin | 1893–1895 | Kansas | Dem |
| Thomas E. Martin | 1955–1961 | Iowa | Rep |
| Thomas S. Martin | 1895–1919 | Virginia | Dem |
| James Edgar Martine | 1911–1917 | New Jersey | Dem |
| Mel Martínez | 2005–2009 | Florida | Rep |
| Armistead Thomson Mason | 1816–1817 | Virginia | DemRep |
| James Murray Mason | 1847–1861 | Virginia | Dem |
| Jeremiah Mason | 1813–1817 | New Hampshire | Föd |
| Jonathan Mason | 1800–1803 | Massachusetts | Föd |
| Stevens Thomson Mason | 1794–1803 | Virginia | DemRep |
| William E. Mason | 1897–1903 | Illinois | Rep |
| William A. Massey | 1912–1913 | Nevada | Rep |
| Harlan Mathews | 1993–1994 | Tennessee | Dem |
| Elisha Mathewson | 1807–1811 | Rhode Island | DemRep |
| Charles Mathias | 1969–1987 | Maryland | Rep |
| Spark Matsunaga | 1977–1990 | Hawaii | Dem |
| Stanley Matthews | 1877–1879 | Ohio | Dem |
| Mack Mattingly | 1981–1987 | Georgia | Rep |
| Samuel B. Maxey | 1875–1887 | Texas | Dem |
| Burnet R. Maybank | 1941–1954 | South Carolina | Dem |
| Earle Bradford Mayfield | 1923–1929 | Texas | Dem |
| William Gibbs McAdoo | 1933–1938 | Kalifornien | Dem |
| George W. McBride | 1895–1901 | Oregon | Rep |
| Pat McCarran | 1933–1954 | Nevada | Dem |
| Eugene McCarthy | 1959–1971 | Minnesota | DFL (Dem) |
| Joseph McCarthy | 1947–1957 | Wisconsin | Rep |
| John Little McClellan | 1943–1977 | Arkansas | Dem |
| James A. McClure | 1973–1991 | Idaho | Rep |
| Louis E. McComas | 1899–1905 | Maryland | Rep |
| Mitch McConnell | 1985– | Kentucky | Rep |
| William J. McConnell | 1890–1891 | Idaho | Rep |
| David H. McCormick | 2025– | Pennsylvania | Rep |
| Joseph M. McCormick | 1919–1925 | Illinois | Rep |
| James B. McCreary | 1903–1909 | Kentucky | Dem |
| Thomas C. McCreery | 1868–1871 1873–1879 | Kentucky | Dem |
| Porter J. McCumber | 1899–1923 | North Dakota | Rep |
| Roscoe C. McCulloch | 1929–1930 | Ohio | Rep |
| James W. McDill | 1881–1883 | Iowa | Rep |
| Alexander McDonald | 1868–1871 | Arkansas | Rep |
| Joseph E. McDonald | 1875–1881 | Indiana | Rep |
| James A. McDougall | 1861–1867 | Kalifornien | Dem |
| George McDuffie | 1842–1846 | South Carolina | Dem |
| Samuel D. McEnery | 1897–1910 | Louisiana | Dem |
| Ernest McFarland | 1941–1953 | Arizona | Dem |
| Gale W. McGee | 1959–1977 | Wyoming | Dem |
| George McGill | 1931–1939 | Kansas | Dem |
| George McGovern | 1963–1981 | South Dakota | Dem |
| J. Howard McGrath | 1947–1949 | Rhode Island | Dem |
| Joseph McIlvaine | 1823–1826 | New Jersey | NatRep |
| Thomas J. McIntyre | 1962–1979 | New Hampshire | Dem |
| Samuel McKean | 1833–1839 | Pennsylvania | Dem |
| Kenneth McKellar | 1917–1953 | Tennessee | Dem |
| John McKinley | 1826–1831 1837 | Alabama | Dem |
| William B. McKinley | 1921–1926 | Illinois | Rep |
| Louis McLane | 1827–1829 | Delaware | Dem |
| Anselm J. McLaurin | 1894–1895 1901–1909 | Illinois | Dem |
| John L. McLaurin | 1897–1903 | South Carolina | Dem |
| George P. McLean | 1911–1929 | Connecticut | Rep |
| John McLean | 1824–1825 | Illinois | DemRep |
| John McLean | 1829–1830 | Illinois | Dem |
| Brien McMahon | 1945–1952 | Connecticut | Dem |
| William H. McMaster | 1925–1931 | South Dakota | Rep |
| James McMillan | 1889–1902 | Michigan | Rep |
| Samuel J. R. McMillan | 1875–1887 | Minnesota | Rep |
| Patrick V. McNamara | 1955–1966 | Michigan | Dem |
| Charles L. McNary | 1917–1918 1918–1944 | Oregon | Rep |
| John R. McPherson | 1877–1895 | New Jersey | Dem |
| John J. McRae | 1851–1852 | Mississippi | Dem |
| Samuel McRoberts | 1841–1843 | Illinois | Dem |
| Martha McSally | 2019–2021 | Arizona | Rep |
| James M. Mead | 1938–1947 | New York | Dem |
| Rice W. Means | 1924–1927 | Colorado | Rep |
| Edwin L. Mechem | 1962–1964 | New Mexico | Rep |
| Return J. Meigs | 1808–1810 | Ohio | DemRep |
| John Melcher | 1977–1989 | Montana | Dem |
| Prentiss Mellen | 1818–1820 | Massachusetts | Föd |
| Bob Menendez | 2007–2024 | New Jersey | Dem |
| David Meriwether | 1852 | Kentucky | Dem |
| Jeff Merkley | 2009– | Oregon | Dem |
| William Duhurst Merrick | 1838–1845 | Maryland | Whig |
| Augustus Summerfield Merrimon | 1873–1879 | North Carolina | Dem |
| Jesse H. Metcalf | 1924–1937 | Rhode Island | Rep |
| Lee Metcalf | 1961–1978 | Montana | Dem |
| Thomas Metcalfe | 1848–1849 | Kentucky | Whig |
| Howard Metzenbaum | 1974–1975 1976–1995 | Ohio | Dem |
| Barbara Mikulski | 1987–2017 | Maryland | Dem |
| Joseph Millard | 1901–1907 | Nebraska | Rep |
| John Milledge | 1977–1989 | Georgia | DemRep |
| Bert H. Miller | 1949 | Idaho | Dem |
| Homer Miller | 1871 | Georgia | Dem |
| Jack Miller | 1961–1973 | Iowa | Rep |
| Jacob W. Miller | 1841–1853 | New Jersey | Whig |
| John E. Miller | 1937–1941 | Arkansas | Dem |
| John Franklin Miller | 1881–1886 | Kalifornien | Rep |
| Stephen Decatur Miller | 1831–1833 | South Carolina | Null |
| Warner Miller | 1881–1887 | New York | Rep |
| Zell Miller | 2000–2005 | Georgia | Dem |
| Eugene Millikin | 1941–1957 | Colorado | Rep |
| Elijah H. Mills | 1820–1827 | Massachusetts | Föd |
| Roger Q. Mills | 1892–1899 | Texas | Dem |
| John Gerald Milton | 1938 | New Jersey | Dem |
| William Hall Milton | 1908–1909 | Florida | Dem |
| Sherman Minton | 1935–1941 | Indiana | Dem |
| Charles B. Mitchel | 1861 | Arkansas | Dem |
| George J. Mitchell | 1980–1995 | Maine | Dem |
| Hugh Mitchell | 1945–1946 | Washington | Dem |
| John H. Mitchell | 1873–1879 1885–1897 1901–1905 | Oregon | Rep |
| John I. Mitchell | 1881–1887 | Pennsylvania | Rep |
| John L. Mitchell | 1893–1899 | Wisconsin | Dem |
| Stephen Mix Mitchell | 1793–1795 | Connecticut | Pro |
| Samuel L. Mitchill | 1804–1809 | New York | DemRep |
| Walter Mondale | 1964–1973 | Minnesota | DFL (Dem) |
| Hernando Money | 1897–1911 | Mississippi | Dem |
| James Monroe | 1790–1794 | Virginia | Anti |
| A. S. Mike Monroney | 1951–1969 | Oklahoma | Dem |
| Joseph Montoya | 1965–1977 | New Mexico | Dem |
| Ashley Moody | 2025- | Florida | Rep |
| Blair Moody | 1951–1952 | Michigan | Dem |
| Gideon C. Moody | 1889–1891 | South Dakota | Rep |
| Wyman B. S. Moor | 1848 | Maine | Dem |
| A. Harry Moore | 1935–1938 | New Jersey | Dem |
| Andrew Moore | 1804 1804–1809 | Virginia | DemRep |
| Edward H. Moore | 1943–1949 | Oklahoma | Rep |
| Jerry Moran | 2011– | Kansas | Rep |
| James Turner Morehead | 1841–1847 | Kentucky | Whig |
| Bernie Moreno | 2025– | Ohio | Rep |
| Edwin D. Morgan | 1863–1869 | New York | Rep |
| John Tyler Morgan | 1877–1907 | Alabama | Dem |
| Robert Burren Morgan | 1975–1981 | North Carolina | Dem |
| David L. Morril | 1817–1823 | New Hampshire | DemRep |
| Lot M. Morrill | 1861–1869 1869–1876 | Maine | Rep |
| Justin Smith Morrill | 1867–1898 | Vermont | Rep |
| Gouverneur Morris | 1800–1803 | New York | Föd |
| Robert Morris | 1789–1795 | Pennsylvania | Pro |
| Thomas Morris | 1833–1839 | Ohio | Dem |
| Cameron A. Morrison | 1930–1932 | North Carolina | Dem |
| Dwight Morrow | 1930–1931 | New Jersey | Rep |
| Jeremiah Morrow | 1813–1819 | Ohio | DemRep |
| Wayne Morse | 1945–1952 | Oregon | Rep |
| Wayne Morse | 1952–1955 | Oregon | Unabh |
| Wayne Morse | 1955–1969 | Oregon | Dem |
| Jackson Morton | 1849–1855 | Florida | Whig |
| Oliver Hazard Perry Morton | 1867–1877 | Indiana | Rep |
| Thruston Ballard Morton | 1957–1968 | Kentucky | Rep |
| George H. Moses | 1918–1933 | New Hampshire | Rep |
| John Moses | 1945 | North Dakota | Dem |
| Frank Moss | 1959–1977 | Utah | Dem |
| Alexander Mouton | 1837–1842 | Louisiana | Dem |
| Daniel Patrick Moynihan | 1977–2001 | New York | Dem |
| Peter Muhlenberg | 1801 | Pennsylvania | DemRep |
| Frederick W. Mulkey | 1907 1918 | Oregon | Rep |
| Markwayne Mullin | 2023– | Oklahoma | Rep |
| Karl Earl Mundt | 1948–1973 | South Dakota | Rep |
| Orrice Abram Murdock | 1941–1947 | Utah | Dem |
| Frank Murkowski | 1981–2002 | Alaska | Rep |
| Lisa Murkowski | 2002– | Alaska | Rep |
| Chris Murphy | 2013– | Connecticut | Dem |
| Edward Murphy | 1893–1899 | New York | Dem |
| George Murphy | 1965–1971 | Kalifornien | Rep |
| Maurice J. Murphy | 1961–1962 | New Hampshire | Rep |
| Richard L. Murphy | 1933–1936 | Iowa | Dem |
| James E. Murray | 1934–1961 | Montana | Dem |
| Patty Murray | 1993– | Washington | Dem |
| Edmund Muskie | 1959–1980 | Maine | Dem |
| Francis J. Myers | 1945–1951 | Pennsylvania | Dem |
| Henry L. Myers | 1911–1923 | Montana | Dem |

### N

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Arnold Naudain | 1830–1836 | Delaware | NatRep |
| Matthew M. Neely | 1923–1929 1931–1941 1949–1958 | West Virginia | Dem |
| Arthur E. Nelson | 1942 | Minnesota | Rep |
| Ben Nelson | 2001–2013 | Nebraska | Dem |
| Gaylord Nelson | 1963–1981 | Wisconsin | Dem |
| Knute Nelson | 1896–1923 | Minnesota | Rep |
| James W. Nesmith | 1861–1867 | Oregon | Dem |
| Maurine Brown Neuberger | 1960–1967 | Oregon | Dem |
| Richard L. Neuberger | 1955–1960 | Oregon | Dem |
| Harry Stewart New | 1916–1922 | Indiana | Rep |
| Truman Handy Newberry | 1919–1922 | Michigan | Rep |
| Francis G. Newlands | 1903–1917 | Nevada | Dem |
| Robert C. Nicholas | 1836–1841 | Louisiana | Dem |
| Wilson Cary Nicholas | 1799–1804 | Virginia | DemRep |
| Alfred O. P. Nicholson | 1840–1842 | Tennessee | Dem |
| Samuel D. Nicholson | 1921–1923 | Colorado | Rep |
| Don Nickles | 1981–2005 | Oklahoma | Rep |
| John Milton Niles | 1835–1839 1843–1849 | Connecticut | Dem |
| George S. Nixon | 1905–1912 | Nevada | Rep |
| Richard Nixon | 1951–1953 | Kalifornien | Rep |
| James Noble | 1816–1831 | Indiana | DemRep |
| Peter Norbeck | 1921–1936 | South Dakota | Rep |
| George W. Norris | 1913–1936 | Nebraska | Rep |
| George W. Norris | 1936–1943 | Nebraska | Unabh |
| Moses Norris | 1849–1855 | New Hampshire | Dem |
| William North | 1798 | New York | Föd |
| Daniel S. Norton | 1865–1870 | Minnesota | Rep |
| John Norvell | 1837–1841 | Michigan | Dem |
| Thomas M. Norwood | 1871–1877 | Georgia | Dem |
| Amos Nourse | 1857 | Maine | Rep |
| John F. Nugent | 1918–1921 | Idaho | Dem |
| Sam Nunn | 1973–1997 | Georgia | Dem |
| Gerald Nye | 1925–1945 | North Dakota | Rep |
| James W. Nye | 1864–1873 | Nevada | Rep |

### O

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Herbert O’Conor | 1947–1953 | Maryland | Dem |
| W. Lee O’Daniel | 1941–1949 | Texas | Dem |
| James Aloysius O’Gorman | 1911–1917 | New York | Dem |
| Joseph C. O’Mahoney | 1934–1953 1954–1961 | Wyoming | Dem |
| Barack Obama | 2004–2008 | Illinois | Dem |
| Tasker Oddie | 1921–1933 | Nevada | Rep |
| Aaron Ogden | 1801–1803 | New Jersey | Föd |
| Richard James Oglesby | 1873–1879 | Illinois | Rep |
| Simeon Olcott | 1801–1805 | New Hampshire | Föd |
| George T. Oliver | 1909–1917 | Pennsylvania | Rep |
| Thomas W. Osborn | 1868–1873 | Florida | Rep |
| Jon Ossoff | 2021– | Georgia | Dem |
| Harrison Gray Otis | 1817–1822 | Massachusetts | Föd |
| Lee Slater Overman | 1903–1930 | North Carolina | Dem |
| John H. Overton | 1933–1948 | Louisiana | Dem |
| Robert Latham Owen | 1907–1925 | Oklahoma | Dem |

### P

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Bob Packwood | 1969–1995 | Oregon | Rep |
| Algernon Paddock | 1875–1881 1887–1893 | Nebraska | Rep |
| Alex Padilla | 2021- | Kalifornien | Dem |
| Carroll S. Page | 1908–1923 | Vermont | Rep |
| John Page | 1836–1837 | New Hampshire | Dem |
| Elijah Paine | 1795–1801 | Vermont | Föd |
| John M. Palmer | 1891–1897 | Illinois | Dem |
| Thomas W. Palmer | 1883–1889 | Michigan | Rep |
| William A. Palmer | 1818–1823 | Vermont | DemRep |
| William A. Palmer | 1823–1825 | Vermont | NatRep |
| Nahum Parker | 1807–1810 | New Hampshire | DemRep |
| Richard E. Parker | 1836–1837 | Virginia | Dem |
| Albion K. Parris | 1827–1828 | Maine | DemRep |
| John Fabyan Parrott | 1819–1825 | New Hampshire | DemRep |
| Frank C. Partridge | 1930–1931 | Vermont | Rep |
| Samuel Pasco | 1887–1899 | Florida | Dem |
| John O. Pastore | 1950–1976 | Rhode Island | Dem |
| William Paterson | 1789–1790 | New Jersey | Pro |
| David T. Patterson | 1866–1869 | Tennessee | Dem |
| James W. Patterson | 1867–1873 | New Hampshire | Rep |
| John J. Patterson | 1873–1879 | South Carolina | Rep |
| Roscoe C. Patterson | 1929–1935 | Missouri | Rep |
| Thomas M. Patterson | 1901–1907 | Colorado | Dem |
| John Patton | 1894–1895 | Michigan | Rep |
| Rand Paul | 2011– | Kentucky | Rep |
| Frederick G. Payne | 1953–1959 | Maine | Rep |
| Henry B. Payne | 1885–1891 | Ohio | Dem |
| Thomas H. Paynter | 1907–1913 | Kentucky | Dem |
| Roger C. Peace | 1941 | South Carolina | Dem |
| James Pearce | 1843–1861 | Maryland | Whig |
| James Pearce | 1861–1862 | Maryland | Dem |
| James B. Pearson | 1962–1978 | Kansas | Rep |
| Henry R. Pease | 1874–1875 | Mississippi | Rep |
| William A. Peffer | 1891–1897 | Kansas | Pop |
| Claiborne Pell | 1961–1997 | Rhode Island | Dem |
| George H. Pendleton | 1879–1885 | Ohio | Dem |
| Isaac S. Pennybacker | 1845–1847 | Virginia | Dem |
| Boies Penrose | 1897–1921 | Pennsylvania | Rep |
| Claude Pepper | 1937–1951 | Florida | Dem |
| George W. Pepper | 1922–1927 | Pennsylvania | Rep |
| Charles H. Percy | 1967–1985 | Illinois | Rep |
| LeRoy Percy | 1910–1913 | Mississippi | Dem |
| David Perdue | 2015–2021 | Georgia | Rep |
| Bishop W. Perkins | 1892–1893 | Kansas | Rep |
| George Clement Perkins | 1893–1915 | Kalifornien | Rep |
| Kirtland I. Perky | 1912–1913 | Idaho | Dem |
| Gary Peters | 2015– | Michigan | Dem |
| Richard F. Pettigrew | 1889–1901 | South Dakota | Rep |
| John Pettit | 1853–1855 | Indiana | Dem |
| Edmund Pettus | 1897–1907 | Alabama | Dem |
| James D. Phelan | 1915–1921 | Kalifornien | Dem |
| Samuel S. Phelps | 1839–1851 1853–1854 | Vermont | Whig |
| Lawrence C. Phipps | 1919–1931 | Colorado | Rep |
| Israel Pickens | 1826 | Alabama | Dem |
| Timothy Pickering | 1803–1811 | Massachusetts | Föd |
| Franklin Pierce | 1837–1842 | New Hampshire | Dem |
| Gilbert A. Pierce | 1889–1891 | North Dakota | Rep |
| Austin F. Pike | 1883–1896 | New Hampshire | Rep |
| Samuel H. Piles | 1905–1911 | Washington | Rep |
| William B. Pine | 1925–1931 | Oklahoma | Rep |
| Charles Pinckney | 1798–1801 | South Carolina | DemRep |
| William Pinkney | 1819–1822 | Maryland | DemRep |
| Key Pittman | 1913–1940 | Nevada | Dem |
| Orville H. Platt | 1879–1905 | Connecticut | Rep |
| Thomas C. Platt | 1881 1897–1909 | New York | Rep |
| James Pleasants | 1819–1822 | Virginia | DemRep |
| Preston B. Plumb | 1877–1891 | Kansas | Rep |
| William Plumer | 1802–1807 | New Hampshire | Föd |
| George Poindexter | 1830–1835 | Mississippi | Dem |
| Miles Poindexter | 1911–1923 | Washington | Rep |
| Luke P. Poland | 1865–1867 | Vermont | Rep |
| Trusten Polk | 1857–1862 | Missouri | Dem |
| William P. Pollock | 1818–1819 | South Carolina | Dem |
| Atlee Pomerene | 1911–1923 | Ohio | Dem |
| Samuel C. Pomeroy | 1861–1873 | Kansas | Rep |
| John Pool | 1868–1873 | North Carolina | Rep |
| James Pinckney Pope | 1933–1939 | Idaho | Dem |
| John Pope | 1807–1813 | Kentucky | DemRep |
| Alexander Porter | 1833–1837 | Louisiana | Whig |
| Augustus Seymour Porter | 1840–1845 | Michigan | Whig |
| Rob Portman | 2011–2023 | Ohio | Rep |
| Thomas Posey | 1812–1813 | Louisiana | DemRep |
| Charles E. Potter | 1952–1959 | Michigan | Rep |
| Samuel J. Potter | 1803–1804 | Rhode Island | DemRep |
| Richard Potts | 1793–1796 | Maryland | Pro Föd |
| Lazarus W. Powell | 1859–1865 | Kentucky | Dem |
| Thomas C. Power | 1890–1895 | Montana | Rep |
| Daniel D. Pratt | 1869–1875 | Indiana | Rep |
| Thomas Pratt | 1850–1857 | Maryland | Whig |
| Samuel Prentiss | 1831–1837 | Vermont | NatRep |
| Samuel Prentiss | 1837–1842 | Vermont | Whig |
| Larry Pressler | 1979–1997 | South Dakota | Rep |
| William C. Preston | 1833–1837 | South Carolina | Null |
| William C. Preston | 1837–1842 | South Carolina | Whig |
| Samuel Price | 1876–1877 | West Virginia | Dem |
| Oliver H. Prince | 1828–1829 | Georgia | Dem |
| Jeter Connelly Pritchard | 1895–1903 | North Carolina | Rep |
| Redfield Proctor | 1874–1875 1891–1908 | Vermont | Rep |
| Winston L. Prouty | 1959–1971 | Vermont | Rep |
| William Proxmire | 1957–1989 | Wisconsin | Dem |
| David Pryor | 1979–1997 | Arkansas | Dem |
| Luke Pryor | 1880 | Alabama | Dem |
| Mark Pryor | 2003–2015 | Arkansas | Dem |
| George E. Pugh | 1855–1861 | Ohio | Dem |
| James L. Pugh | 1880–1897 | Alabama | Dem |
| William E. Purcell | 1910–1911 | North Dakota | Dem |
| William A. Purtell | 1952 1953–1959 | Connecticut | Rep |
| Gladys Pyle | 1938–1939 | South Dakota | Rep |

### Q

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Joseph V. Quarles | 1899–1905 | Wisconsin | Rep |
| Matthew Quay | 1887–1899 1901–1904 | Pennsylvania | Rep |
| Dan Quayle | 1981–1989 | Indiana | Rep |

### R

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| George L. P. Radcliffe | 1935–1947 | Maryland | Dem |
| Samuel M. Ralston | 1923–1925 | Indiana | Dem |
| Alexander Ramsey | 1863–1875 | Minnesota | Rep |
| Jennings Randolph | 1958–1985 | West Virginia | Dem |
| John Randolph of Roanoke | 1825–1827 | Virginia | Dem |
| Theodore Fitz Randolph | 1875–1881 | New Jersey | Dem |
| Joseph E. Ransdell | 1913–1931 | Louisiana | Dem |
| Matt Whitaker Ransom | 1872–1895 | North Carolina | Dem |
| Robert Rantoul | 1851 | Massachusetts | Dem |
| Joseph Lafayette Rawlins | 1897–1903 | Utah | Dem |
| Charles A. Rawson | 1922 | Iowa | Rep |
| Isidor Rayner | 1905–1912 | Maryland | Dem |
| George Read | 1789–1793 | Delaware | Pro |
| Jacob Read | 1795–1801 | South Carolina | Föd |
| John Henninger Reagan | 1887–1891 | Texas | Dem |
| Alfred E. Reames | 1938 | Oregon | Dem |
| Clyde M. Reed | 1939–1949 | Kansas | Rep |
| David A. Reed | 1922–1935 | Pennsylvania | Rep |
| Jack Reed | 1997– | Rhode Island | Dem |
| James A. Reed | 1911–1929 | Missouri | Dem |
| Philip Reed | 1806–1813 | Maryland | DemRep |
| Thomas Buck Reed | 1826–1827 1829 | Mississippi | Dem |
| David Settle Reid | 1854–1859 | North Carolina | Dem |
| Harry Reid | 1987–2017 | Nevada | Dem |
| Hiram Rhodes Revels | 1870–1871 | Mississippi | Rep |
| W. Chapman Revercomb | 1943–1949 1956–1959 | West Virginia | Rep |
| Robert Rice Reynolds | 1932–1945 | North Carolina | Dem |
| Samuel W. Reynolds | 1954 | Nebraska | Rep |
| Robert Rhett | 1850–1852 | South Carolina | Dem |
| Abraham A. Ribicoff | 1963–1981 | Connecticut | Dem |
| Benjamin F. Rice | 1868–1873 | Arkansas | Rep |
| Henry Mower Rice | 1858–1863 | Minnesota | Dem |
| Harry A. Richardson | 1907–1913 | Delaware | Rep |
| William Alexander Richardson | 1863–1865 | Illinois | Dem |
| Pete Ricketts | 2023– | Nebraska | Rep |
| George R. Riddle | 1864–1867 | Delaware | Dem |
| Harrison H. Riddleberger | 1883–1889 | Virginia | Readj (Rep) |
| Henry M. Ridgely | 1827–1829 | Delaware | Föd |
| Donald W. Riegle | 1977–1995 | Michigan | Dem |
| Jim Risch | 2009– | Idaho | Rep |
| William Cabell Rives | 1832–1834 | Virginia | Dem |
| William Cabell Rives | 1836–1845 | Virginia | Whig |
| William N. Roach | 1893–1899 | North Dakota | Dem |
| William H. Roane | 1837–1841 | Virginia | Dem |
| Chuck Robb | 1989–2001 | Virginia | Dem |
| Asher Robbins | 1825–1839 | Rhode Island | NatRep Whig |
| Jonathan Roberts | 1814–1821 | Pennsylvania | DemRep |
| Pat Roberts | 1997–2021 | Kansas | Rep |
| Absalom Willis Robertson | 1946–1966 | Virginia | Dem |
| Edward V. Robertson | 1943–1949 | Wyoming | Dem |
| Thomas J. Robertson | 1868–1877 | South Carolina | Rep |
| Arthur Raymond Robinson | 1925–1935 | Indiana | Rep |
| John McCracken Robinson | 1830–1841 | Illinois | Dem |
| Jonathan Robinson | 1807–1815 | Vermont | DemRep |
| Joseph Taylor Robinson | 1913–1937 | Arkansas | Dem |
| Moses Robinson | 1791–1796 | Vermont | Anti DemRep |
| John M. Robsion | 1930 | Kentucky | Rep |
| Lisa Blunt Rochester | 2025– | Delaware | Dem |
| Jay Rockefeller | 1985–2015 | West Virginia | Dem |
| Julius Rockwell | 1854–1855 | Massachusetts | Whig |
| Caesar A. Rodney | 1822–1823 | Delaware | DemRep |
| Daniel Rodney | 1826–1827 | Delaware | NatRep |
| Mitt Romney | 2019–2025 | Utah | Rep |
| Edward H. Rollins | 1877–1883 | New Hampshire | Rep |
| Elihu Root | 1909–1915 | New York | Rep |
| Jacky Rosen | 2019– | Nevada | Dem |
| Joseph Rosier | 1941–1942 | West Virginia | Dem |
| Edmund G. Ross | 1866–1871 | Kansas | Rep |
| James Ross | 1794–1803 | Pennsylvania | Pro Föd |
| Jonathan Ross | 1899–1900 | Vermont | Rep |
| William V. Roth | 1971–2001 | Delaware | Rep |
| Mike Rounds | 2015– | South Dakota | Rep |
| John Rowan | 1825–1831 | Kentucky | DemRep |
| Marco Rubio | 2011– | Florida | Rep |
| Benjamin Ruggles | 1815–1824 | Ohio | DemRep |
| Benjamin Ruggles | 1824–1833 | Ohio | NatRep |
| John Ruggles | 1835–1841 | Maine | Dem |
| Warren Rudman | 1981–1993 | New Hampshire | Rep |
| Thomas Jefferson Rusk | 1846–1857 | Texas | Dem |
| Donald S. Russell | 1965–1966 | South Carolina | Dem |
| Richard Russell | 1933–1971 | Georgia | Dem |
| John Rutherfurd | 1791–1798 | New Jersey | Pro Föd |

### S

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Dwight M. Sabin | 1883–1889 | Minnesota | Rep |
| Frederic M. Sackett | 1925–1930 | Kentucky | Rep |
| Ken Salazar | 2004–2009 | Colorado | Dem |
| Pierre Salinger | 1964–1965 | Kalifornien | Dem |
| Leverett Saltonstall | 1945–1967 | Massachusetts | Rep |
| Bernie Sanders | 2007– | Vermont | Unabh (Dem) |
| Newell Sanders | 1912–1913 | Tennessee | Rep |
| Wilbur F. Sanders | 1890–1893 | Montana | Rep |
| Nathan Sanford | 1815–1821 | New York | DemRep |
| Nathan Sanford | 1826–1831 | New York | NatRep |
| Terry Sanford | 1986–1993 | North Carolina | Dem |
| Rick Santorum | 1995–2007 | Pennsylvania | Rep |
| Paul Sarbanes | 1977–2007 | Maryland | Dem |
| Aaron A. Sargent | 1873–1879 | Kalifornien | Rep |
| Ben Sasse | 2015–2023 | Nebraska | Rep |
| Jim Sasser | 1977–1995 | Tennessee | Dem |
| Eli M. Saulsbury | 1871–1889 | Delaware | Dem |
| Willard Saulsbury Jr. | 1913–1919 | Delaware | Dem |
| Willard Saulsbury Sr. | 1859–1871 | Delaware | Dem |
| Alvin Saunders | 1877–1883 | Nebraska | Rep |
| Frederick A. Sawyer | 1868–1873 | South Carolina | Rep |
| Philetus Sawyer | 1881–1893 | Wisconsin | Rep |
| William B. Saxbe | 1969–1975 | Ohio | Dem |
| Thomas D. Schall | 1925–1935 | Minnesota | Rep |
| Brian Schatz | 2012– | Hawaii | Dem |
| Adam Schiff | 2024– | Kalifornien | Dem |
| Eric Schmitt | 2023– | Missouri | Rep |
| Harrison Schmitt | 1977–1983 | New Mexico | Rep |
| Andrew Frank Schoeppel | 1949–1962 | Kansas | Rep |
| Chuck Schumer | 1999– | New York | Dem |
| James Schureman | 1799–1801 | New Jersey | Föd |
| Carl Schurz | 1869–1871 | Missouri | Rep |
| Carl Schurz | 1871–1875 | Missouri | LibRep |
| Karl C. Schuyler | 1932–1933 | Colorado | Rep |
| Philip Schuyler | 1789–1791 | New York | Pro |
| Philip Schuyler | 1797–1798 | New York | Föd |
| Henry H. Schwartz | 1937–1943 | Wyoming | Dem |
| Richard Schweiker | 1969–1981 | Pennsylvania | Rep |
| Hugh Scott | 1959–1977 | Pennsylvania | Rep |
| John Scott | 1869–1875 | Pennsylvania | Rep |
| Nathan B. Scott | 1899–1911 | West Virginia | Rep |
| Rick Scott | 2019– | Florida | Rep |
| Tim Scott | 2013 – | South Carolina | Rep |
| W. Kerr Scott | 1954–1958 | North Carolina | Dem |
| William L. Scott | 1973–1979 | Virginia | Rep |
| James G. Scrugham | 1942–1945 | Nevada | Dem |
| Fred Andrew Seaton | 1951–1952 | Nebraska | Rep |
| William K. Sebastian | 1848–1861 | Arkansas | Dem |
| Theodore Sedgwick | 1796–1799 | Massachusetts | Föd |
| James Semple | 1843–1847 | Illinois | Dem |
| Jeff Sessions | 1997–2017 | Alabama | Rep |
| Ambrose Hundley Sevier | 1836–1848 | Arkansas | Dem |
| William H. Seward | 1849–1854 | New York | Whig |
| William H. Seward | 1854–1861 | New York | Rep |
| William Joyce Sewell | 1881–1887 1895–1901 | New Jersey | Rep |
| Horatio Seymour | 1821–1824 | Vermont | DemRep |
| Horatio Seymour | 1824–1833 | Vermont | NatRep |
| John F. Seymour | 1991–1992 | Kalifornien | Rep |
| John F. Shafroth | 1913–1919 | Colorado | Dem |
| Jeanne Shaheen | 2009– | New Hampshire | Dem |
| William Sharon | 1875–1881 | Nevada | Rep |
| James Sheafe | 1801–1802 | New Hampshire | Föd |
| Tim Sheehy | 2025– | Montana | Rep |
| William Paine Sheffield | 1884–1885 | Rhode Island | Rep |
| Richard Shelby | 1987–1994 | Alabama | Dem |
| Richard Shelby | 1994–2023 | Alabama | Rep |
| Ether Shepley | 1833–1836 | Maine | Dem |
| Morris Sheppard | 1913–1941 | Texas | Dem |
| John Sherman | 1861–1877 1881–1897 | Ohio | Rep |
| Lawrence Yates Sherman | 1913–1921 | Illinois | Rep |
| Roger Sherman | 1791–1793 | Connecticut | Pro |
| James Shields | 1849–1855 | Illinois | Dem |
| James Shields | 1858–1859 | Minnesota | Dem |
| James Shields | 1879 | Missouri | Dem |
| John K. Shields | 1913–1925 | Tennessee | Dem |
| Henrik Shipstead | 1923–1941 | Minnesota | FLP |
| Henrik Shipstead | 1941–1947 | Minnesota | Rep |
| Benjamin F. Shively | 1909–1916 | Indiana | Dem |
| Samuel M. Shortridge | 1921–1933 | Kalifornien | Rep |
| Hugh Ike Shott | 1942–1943 | West Virginia | Rep |
| George Laird Shoup | 1890–1901 | Idaho | Rep |
| Nathaniel Silsbee | 1826–1835 | Massachusetts | NatRep |
| Furnifold McLendel Simmons | 1901–1931 | North Carolina | Dem |
| James F. Simmons | 1841–1847 | Rhode Island | Whig |
| James F. Simmons | 1857–1862 | Rhode Island | Rep |
| Joseph Simon | 1898–1903 | Oregon | Rep |
| Paul Simon | 1985–1997 | Illinois | Dem |
| Alan K. Simpson | 1979–1997 | Wyoming | Rep |
| Milward Lee Simpson | 1962–1967 | Wyoming | Rep |
| Kyrsten Sinema | 2019–2022 | Arizona | Dem |
| Kyrsten Sinema | 2022–2025 | Arizona | Unabh (Dem) |
| James H. Slater | 1879–1885 | Oregon | Dem |
| James M. Slattery | 1939–1940 | Illinois | Dem |
| John Slidell | 1853–1861 | Whig | Dem |
| Elissa Slotkin | 2025– | Michigan | Dem |
| George Smathers | 1951–1969 | Florida | Dem |
| William H. Smathers | 1937–1943 | New Jersey | Dem |
| Benjamin A. Smith | 1960–1962 | Massachusetts | Dem |
| Daniel Smith | 1798–1799 | Tennessee | DemRep |
| Delazon Smith | 1859 | Oregon | Dem |
| Ellison D. Smith | 1909–1944 | South Carolina | Dem |
| Gordon H. Smith | 1997–2009 | Oregon | Rep |
| Howard Alexander Smith | 1944–1959 | New Jersey | Rep |
| Israel Smith | 1803–1807 | Vermont | DemRep |
| James Smith | 1893–1899 | New Jersey | Dem |
| John Smith | 1804–1813 | New York | DemRep |
| John Smith | 1803–1808 | Ohio | DemRep |
| John Walter Smith | 1908–1921 | Maryland | Dem |
| M. Hoke Smith | 1911–1921 | Georgia | Dem |
| Marcus A. Smith | 1912–1921 | Arizona | Dem |
| Margaret Chase Smith | 1949–1973 | Maine | Rep |
| Nathan Smith | 1833–1835 | Connecticut | Whig |
| Oliver H. Smith | 1837–1843 | Indiana | Whig |
| Perry Smith | 1837–1843 | Connecticut | Dem |
| Ralph Tyler Smith | 1969–1970 | Illinois | Rep |
| Robert C. Smith | 1991–2003 | New Hampshire | Rep |
| Samuel Smith | 1803–1815 | Maryland | DemRep |
| Samuel Smith | 1822–1833 | Maryland | Dem |
| Tina Smith | 2018– | Minnesota | DFL (Dem) |
| Truman Smith | 1849–1854 | Connecticut | Whig |
| William Smith | 1816–1823 | South Carolina | DemRep |
| William Smith | 1826–1831 | South Carolina | Dem |
| William Alden Smith | 1907–1919 | Michigan | Rep |
| Willis Smith | 1950–1953 | North Carolina | Dem |
| Reed Smoot | 1903–1933 | Utah | Rep |
| Olympia Snowe | 1995–2013 | Maine | Rep |
| Pierre Soulé | 1847 1849–1853 | Louisiana | Dem |
| Samuel L. Southard | 1821–1823 | New Jersey | DemRep |
| Samuel L. Southard | 1833–1842 | New Jersey | Whig |
| John Sparkman | 1946–1979 | Alabama | Dem |
| Arlen Specter | 1980–2009 | Pennsylvania | Rep |
| Arlen Specter | 2009–2011 | Pennsylvania | Dem |
| Jesse Speight | 1845–1847 | Mississippi | Dem |
| John S. Spence | 1836–1840 | Maryland | NatRep Whig |
| G. Lloyd Spencer | 1941–1943 | Arkansas | Dem |
| George E. Spencer | 1868–1879 | Alabama | Rep |
| Selden P. Spencer | 1918–1925 | Missouri | Rep |
| William B. Spong | 1966–1973 | Virginia | Dem |
| John Coit Spooner | 1885–1891 1897–1907 | Wisconsin | Rep |
| Watson C. Squire | 1889–1897 | Washington | Rep |
| Peleg Sprague | 1829–1835 | Maine | NatRep |
| William Sprague III | 1842–1844 | Rhode Island | Whig |
| William Sprague IV | 1863–1875 | Rhode Island | Rep |
| Presley Spruance | 1847–1853 | Delaware | Whig |
| Debbie Stabenow | 2001–2025 | Michigan | Dem |
| Robert Stafford | 1971–1989 | Vermont | Rep |
| Robert N. Stanfield | 1921–1927 | Oregon | Rep |
| William A. Stanfill | 1945–1946 | Kentucky | Rep |
| Leland Stanford | 1885–1893 | Kalifornien | Rep |
| Augustus Owsley Stanley | 1919–1925 | Kentucky | Dem |
| Joseph Stanton | 1790–1793 | Rhode Island | Anti |
| Benjamin Stark | 1861–1862 | Oregon | Dem |
| Ozora P. Stearns | 1871 | Minnesota | Rep |
| Daniel F. Steck | 1926–1931 | Iowa | Dem |
| Frederick Steiwer | 1927–1938 | Oregon | Rep |
| John C. Stennis | 1947–1989 | Mississippi | Dem |
| Hubert D. Stephens | 1923–1935 | Mississippi | Dem |
| Isaac Stephenson | 1907–1915 | Wisconsin | Rep |
| Thomas Sterling | 1913–1925 | South Dakota | Rep |
| Ted Stevens | 1969–2009 | Alaska | Rep |
| Adlai Stevenson | 1970–1981 | Illinois | Dem |
| John W. Stevenson | 1871–1877 | Kentucky | Dem |
| David Stewart | 1849–1850 | Maryland | Whig |
| David W. Stewart | 1926–1927 | Iowa | Rep |
| Donald W. Stewart | 1978–1981 | Alabama | Dem |
| John Wolcott Stewart | 1908 | Vermont | Rep |
| Tom Stewart | 1939–1949 | Tennessee | Dem |
| William M. Stewart | 1864–1875 1887–1905 | Nevada | Rep |
| John P. Stockton | 1865–1866 1869–1875 | New Jersey | Dem |
| Richard Stockton | 1796–1799 | New Jersey | Föd |
| Robert F. Stockton | 1851–1853 | New Jersey | Dem |
| Montfort Stokes | 1816–1823 | North Carolina | DemRep |
| David Stone | 1813–1814 | North Carolina | DemRep |
| Richard Stone | 1975–1989 | Florida | Dem |
| William J. Stone | 1903–1918 | Missouri | Dem |
| Clement Storer | 1817–1819 | New Hampshire | DemRep |
| Thomas M. Storke | 1938–1939 | Kalifornien | Dem |
| Luther Strange | 2017–2018 | Alabama | Rep |
| Robert Strange | 1836–1840 | North Carolina | Dem |
| Caleb Strong | 1789–1796 | Massachusetts | Pro Föd |
| Charles E. Stuart | 1853–1859 | Michigan | Dem |
| Daniel Sturgeon | 1840–1851 | Pennsylvania | Dem |
| Dan Sullivan | 2015– | Alaska | Rep |
| Patrick Joseph Sullivan | 1929–1930 | Wyoming | Rep |
| William V. Sullivan | 1898–1901 | Mississippi | Dem |
| Charles Sumner | 1851–1854 | Massachusetts | Free Soil |
| Charles Sumner | 1854–1870 | Massachusetts | Rep |
| Charles Sumner | 1870–1874 | Massachusetts | LibRep |
| Thomas Sumter | 1801–1810 | South Carolina | DemRep |
| John E. Sununu | 2002–2008 | New Hampshire | Rep |
| George Sutherland | 1905–1917 | Utah | Rep |
| Howard Sutherland | 1917–1923 | West Virginia | Rep |
| Claude A. Swanson | 1910–1933 | Virginia | Dem |
| Benjamin Swift | 1833–1839 | Vermont | Whig |
| Stuart Symington | 1953–1977 | Missouri | Dem |
| Steve Symms | 1981–1993 | Idaho | Rep |

### T

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Horace Tabor | 1883 | Colorado | Rep |
| Kingsley A. Taft | 1946–1947 | Ohio | Rep |
| Robert Taft | 1939–1953 | Ohio | Rep |
| Robert Taft Jr. | 1971–1976 | Ohio | Rep |
| Thomas Taggart | 1916 | Indiana | Dem |
| Charles Tait | 1809–1819 | Georgia | DemRep |
| Isham Talbot | 1815–1819 1820–1825 | Kentucky | DemRep |
| Jim Talent | 2002–2007 | Missouri | Rep |
| James Taliaferro | 1899–1911 | Florida | Dem |
| Nathaniel P. Tallmadge | 1833–1839 1840–1844 | New York | Dem |
| Herman Talmadge | 1957–1981 | Georgia | Dem |
| Benjamin Tappan | 1839–1845 | Ohio | Dem |
| Josiah Tattnall | 1796–1799 | Georgia | DemRep |
| Glen H. Taylor | 1945–1951 | Idaho | Dem |
| John Taylor | 1810–1816 | South Carolina | DemRep |
| John Taylor of Caroline | 1792–1794 | Virginia | Anti |
| John Taylor of Caroline | 1803 1822–1824 | Virginia | DemRep |
| Robert Love Taylor | 1907–1912 | Tennessee | Dem |
| Waller Taylor | 1816–1825 | Indiana | DemRep |
| Henry Tazewell | 1794–1799 | Virginia | Anti DemRep |
| Littleton Waller Tazewell | 1824–1832 | Virginia | Dem |
| John C. Ten Eyck | 1859–1865 | New Jersey | Rep |
| Henry Moore Teller | 1876–1882 1885–1909 | Colorado | Rep Dem |
| Joseph M. Terrell | 1910–1911 | Georgia | Dem |
| Jon Tester | 2007–2025 | Montana | Dem |
| John Milton Thayer | 1867–1871 | Nebraska | Rep |
| Charles S. Thomas | 1913–1921 | Colorado | Dem |
| Craig L. Thomas | 1995–2007 | Wyoming | Rep |
| Elbert D. Thomas | 1933–1951 | Utah | Dem |
| Elmer Thomas | 1927–1951 | Oklahoma | Dem |
| Jesse B. Thomas | 1818–1829 | Illinois | DemRep |
| John W. Thomas | 1928–1933 1940–1945 | Idaho | Rep |
| Philip F. Thomas | (1867) | Maryland | Dem |
| Edwin Keith Thomson | (1961) | Wyoming | Rep |
| John Renshaw Thomson | 1853–1862 | New Jersey | Dem |
| Fountain L. Thompson | 1909–1910 | North Dakota | Dem |
| Fred Thompson | 1994–2003 | Tennessee | Rep |
| John Burton Thompson | 1853–1859 | Kentucky | Whig |
| Thomas W. Thompson | 1814–1817 | New Hampshire | Föd |
| William Henry Thompson | 1933–1934 | Nebraska | Dem |
| William Howard Thompson | 1913–1919 | Kansas | Dem |
| John Thornton | 1910–1915 | Louisiana | Dem |
| Buckner Thruston | 1805–1809 | Kentucky | DemRep |
| John Thune | 2005– | South Dakota | Rep |
| Allen G. Thurman | 1869–1881 | Ohio | Dem |
| Strom Thurmond | 1954–1956 1956–1964 | South Carolina | Dem |
| Strom Thurmond | 1964–2003 | South Carolina | Rep |
| John Mellen Thurston | 1895–1901 | Nebraska | Rep |
| Edward John Thye | 1947–1959 | Minnesota | Rep |
| Isaac Tichenor | 1796–1797 1815–1821 | Vermont | Föd |
| Edward Tiffin | 1807–1809 | Ohio | DemRep |
| Thom Tillis | 2015– | North Carolina | Rep |
| Benjamin Tillman | 1895–1918 | South Carolina | Dem |
| John Tipton | 1832–1839 | Indiana | Dem |
| Thomas Tipton | 1867–1875 | Nebraska | Rep |
| Charles W. Tobey | 1939–1953 | New Hampshire | Rep |
| Gideon Tomlinson | 1831–1837 | Connecticut | NatRep |
| Robert Toombs | 1853–1861 | Georgia | Dem |
| Pat Toomey | 2011–2023 | Pennsylvania | Rep |
| Robert Torricelli | 1997–2003 | New Jersey | Dem |
| Isaac Toucey | 1852–1857 | Connecticut | Dem |
| John Tower | 1961–1985 | Texas | Rep |
| Charles A. Towne | 1900–1901 | Minnesota | Dem |
| Charles E. Townsend | 1911–1923 | Michigan | Rep |
| John G. Townsend | 1929–1941 | Delaware | Rep |
| Uriah Tracy | 1796–1807 | Connecticut | Föd |
| Park Trammell | 1917–1936 | Florida | Dem |
| Paul S. Trible | 1983–1989 | Virginia | Rep |
| William A. Trimble | 1819–1821 | Ohio | DemRep |
| James F. Trotter | 1838 | Mississippi | Dem |
| George Troup | 1816–1818 1829–1833 | Georgia | DemRep Dem |
| Harry S. Truman | 1935–1945 | Missouri | Dem |
| Jonathan Trumbull | 1795–1796 | Connecticut | Föd |
| Lyman Trumbull | 1855–1873 | Illinois | Dem Rep |
| Paul Tsongas | 1979–1985 | Massachusetts | Dem |
| Tommy Tuberville | 2021– | Alabama | Rep |
| James M. Tunnell | 1941–1947 | Delaware | Dem |
| John V. Tunney | 1971–1977 | Kalifornien | Dem |
| Thomas B. Turley | 1897–1901 | Tennessee | Dem |
| George Turner | 1897–1903 | Washington | Dem |
| James Turner | 1805–1816 | North Carolina | DemRep |
| Hopkins L. Turney | 1845–1851 | Tennessee | Dem |
| David Turpie | 1863 1887–1899 | Indiana | Dem |
| Joseph Tydings | 1965–1971 | Maryland | Dem |
| Millard Tydings | 1927–1951 | Maryland | Dem |
| John Tyler | 1827–1836 | Virginia | NatRep Whig |
| Lawrence Tyson | 1925–1929 | Tennessee | Dem |

### U

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Mark Udall | 2009–2015 | Colorado | Dem |
| Tom Udall | 2009–2021 | New Mexico | Dem |
| William B. Umstead | 1946–1948 | North Carolina | Dem |
| Joseph R. Underwood | 1847–1853 | Kentucky | Whig |
| Oscar Underwood | 1915–1927 | Alabama | Dem |
| Thomas R. Underwood | 1951–1952 | Kentucky | Dem |
| William Upham | 1843–1853 | Vermont | Whig |
| Robert W. Upton | 1953–1954 | New Hampshire | Rep |

### V

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Martin Van Buren | 1821–1828 | New York | Dem |
| Nicholas Van Dyke | 1817–1826 | Delaware | Föd |
| Chris Van Hollen | 2017– | Maryland | Dem |
| Frederick Van Nuys | 1933–1944 | Indiana | Dem |
| Peter G. Van Winkle | 1863–1869 | West Virginia | Rep |
| Charles Van Wyck | 1881–1887 | Nebraska | Rep |
| JD Vance | 2023–2025 | Ohio | Rep |
| Zebulon Baird Vance | 1879–1894 | North Carolina | Dem |
| Arthur H. Vandenberg | 1928–1951 | Michigan | Rep |
| James K. Vardaman | 1913–1919 | Mississippi | Dem |
| William Scott Vare | 1927–1929 | Pennsylvania | Rep |
| Joseph Bradley Varnum | 1811–1817 | Massachusetts | DemRep |
| Abraham B. Venable | 1803–1804 | Virginia | DemRep |
| George Graham Vest | 1879–1903 | Missouri | Dem |
| George Vickers | 1868–1873 | Maryland | Dem |
| William Freeman Vilas | 1891–1897 | Wisconsin | Dem |
| John M. Vining | 1793–1798 | Delaware | Pro Föd |
| David Vitter | 2005–2017 | Louisiana | Rep |
| George Voinovich | 1998–2011 | Ohio | Rep |
| Daniel W. Voorhees | 1877–1897 | Indiana | Dem |

### W

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Benjamin Wade | 1851–1856 1856–1869 | Ohio | Whig Rep |
| Bainbridge Wadleigh | 1873–1879 | New Hampshire | Rep |
| James Wolcott Wadsworth | 1915–1927 | New York | Rep |
| George A. Waggaman | 1831–1835 | Louisiana | NatRep |
| Robert F. Wagner | 1927–1949 | New York | Dem |
| Frederic C. Walcott | 1929–1935 | Connecticut | Rep |
| John Wales | 1849–1851 | Delaware | Whig |
| Freeman Walker | 1819–1821 | Georgia | DemRep |
| George Walker | 1814 | Kentucky | DemRep |
| Isaac P. Walker | 1848–1855 | Wisconsin | Dem |
| James D. Walker | 1879–1885 | Arkansas | Dem |
| John Walker | 1790 | Virginia | Pro |
| John Williams Walker | 1819–1822 | Alabama | DemRep |
| Robert J. Walker | 1835–1845 | Mississippi | Dem |
| Walter Walker | 1932 | Colorado | Dem |
| Garret D. Wall | 1835–1841 | New Jersey | Dem |
| James Walter Wall | 1863 | New Jersey | Dem |
| William A. Wallace | 1875–1881 | Pennsylvania | Dem |
| Monrad Wallgren | 1940–1945 | Washington | Dem |
| Malcolm Wallop | 1977–1995 | Wyoming | Rep |
| Arthur Walsh | 1943–1944 | New Jersey | Dem |
| David I. Walsh | 1919–1925 1926–1947 | Massachusetts | Dem |
| John Walsh | 2014–2015 | Montana | Dem |
| Patrick Walsh | 1894–1895 | Georgia | Dem |
| Thomas J. Walsh | 1913–1933 | Montana | Dem |
| Herbert S. Walters | 1963–1964 | Tennessee | Dem |
| Edward C. Walthall | 1885–1894 1895–1898 | Mississippi | Dem |
| George Walton | 1795–1796 | Georgia | Föd |
| Matthias Ward | 1858–1859 | Texas | Dem |
| Nicholas Ware | 1821–1824 | Georgia | DemRep |
| John Warner | 1979–2009 | Virginia | Rep |
| Mark Warner | 2009– | Virginia | Dem |
| Willard Warner | 1868–1871 | Alabama | Rep |
| William Warner | 1905–1911 | Missouri | Rep |
| Raphael Warnock | 2021– | Georgia | Dem |
| Elizabeth Warren | 2013– | Massachusetts | Dem |
| Francis E. Warren | 1890–1893 1895–1929 | Wyoming | Rep |
| William B. Washburn | 1874–1875 | Massachusetts | Rep |
| William D. Washburn | 1889–1895 | Minnesota | Rep |
| Charles W. Waterman | 1927–1932 | Colorado | Rep |
| Arthur Vivian Watkins | 1947–1959 | Utah | Rep |
| Clarence Wayland Watson | 1911–1913 | West Virginia | Dem |
| James Watson | 1798–1800 | New York | Föd |
| James Eli Watson | 1916–1933 | Indiana | Rep |
| Thomas E. Watson | 1921–1922 | Georgia | Dem |
| Jim Webb | 2007–2013 | Virginia | Dem |
| William R. Webb | 1913 | Tennessee | Dem |
| Daniel Webster | 1827–1833 1833–1841 1845–1850 | Massachusetts | NatRep Whig |
| John W. Weeks | 1913–1919 | Massachusetts | Rep |
| Sinclair Weeks | 1944 | Massachusetts | Rep |
| Lowell P. Weicker | 1971–1989 | Connecticut | Rep |
| Adonijah Welch | 1868–1869 | Florida | Rep |
| Peter Welch | 2023– | Vermont | Dem |
| Herman Welker | 1951–1957 | Idaho | Rep |
| John B. Weller | 1852–1857 | Kalifornien | Dem |
| Ovington Weller | 1921–1927 | Maryland | Rep |
| George Wellington | 1897–1903 | Maryland | Dem |
| John S. Wells | 1855 | New Hampshire | Dem |
| William H. Wells | 1799–1804 1813–1817 | Delaware | Föd |
| Paul Wellstone | 1991–2002 | Minnesota | Dem |
| Joseph R. West | 1871–1872 1872 1872–1877 | Louisiana | Rep LibRep Rep |
| William S. West | 1914 | Georgia | Dem |
| James Westcott | 1845–1849 | Florida | Dem |
| George P. Wetmore | 1895–1907 1908–1913 | Rhode Island | Rep |
| Jesse Wharton | 1814–1815 | Tennessee | DemRep |
| Burton K. Wheeler | 1923–1947 | Montana | Dem |
| Kenneth S. Wherry | 1943–1951 | Nebraska | Rep |
| James Whitcomb | 1849–1852 | Indiana | Dem |
| Albert Smith White | 1839–1845 | Indiana | Whig |
| Edward Douglass White | 1891–1894 | Louisiana | Dem |
| Francis S. White | 1914–1915 | Alabama | Dem |
| Hugh Lawson White | 1825–1835 1835–1836 1836–1840 | Tennessee | Dem NatRep Whig |
| Samuel White | 1801–1809 | Delaware | Föd |
| Stephen M. White | 1893–1899 | Kalifornien | Dem |
| Wallace H. White | 1931–1949 | Maine | Rep |
| Sheldon Whitehouse | 2007– | Rhode Island | Dem |
| Jenkin Whiteside | 1809–1811 | Tennessee | DemRep |
| Washington C. Whitthorne | 1886–1887 | Tennessee | Dem |
| William Pinkney Whyte | 1868–1869 1875–1881 1906–1908 | Maryland | Dem |
| Roger Wicker | 2009– | Mississippi | Rep |
| Louis Wigfall | 1859–1861 | Texas | Dem |
| Leonard Wilcox | 1842–1843 | New Hampshire | Dem |
| Alexander Wiley | 1939–1963 | Wisconsin | Rep |
| Xenophon P. Wilfley | 1918 | Missouri | Dem |
| William Wilkins | 1831–1834 | Pennsylvania | Dem |
| Morton S. Wilkinson | 1859–1865 | Minnesota | Rep |
| Calvin Willey | 1825–1831 | Connecticut | NatRep |
| Waitman T. Willey | 1861–1863 1863–1871 | Virginia West Virginia | Union Rep |
| Abram P. Williams | 1886–1887 | Kalifornien | Rep |
| George Henry Williams | 1865–1871 | Oregon | Rep |
| George Howard Williams | 1925–1926 | Missouri | Rep |
| Harrison A. Williams | 1959–1982 | New Jersey | Dem |
| Jared W. Williams | 1853–1854 | New Hampshire | Dem |
| John Williams | 1815–1823 | Tennessee | DemRep |
| John J. Williams | 1947–1970 | Delaware | Rep |
| John Sharp Williams | 1911–1923 | Mississippi | Dem |
| John Stuart Williams | 1879–1885 | Kentucky | Dem |
| Reuel Williams | 1837–1843 | Maine | Dem |
| Thomas Hickman Williams | 1838–1839 | Mississippi | Dem |
| Thomas Hill Williams | 1817–1824 1824–1829 | Mississippi | DemRep Dem |
| Ben M. Williamson | 1930–1931 | Kentucky | Dem |
| Frank B. Willis | 1921–1928 | Ohio | Rep |
| Raymond E. Willis | 1941–1947 | Indiana | Rep |
| David Wilmot | 1861–1863 | Pennsylvania | Rep |
| Ephraim King Wilson | 1885–1891 | Maryland | Dem |
| George A. Wilson | 1943–1949 | Iowa | Rep |
| Henry Wilson | 1855 1855–1856 1856–1873 | Massachusetts | Free Soil Am Rep |
| James F. Wilson | 1883–1895 | Iowa | Rep |
| James J. Wilson | 1815–1821 | New Jersey | DemRep |
| John L. Wilson | 1895–1899 | Washington | Rep |
| Pete Wilson | 1983–1991 | Kalifornien | Rep |
| Robert Wilson | 1862–1863 | Missouri | Union |
| William Windom | 1870–1871 1871–1881 1881–1883 | Minnesota | Rep |
| Paine Wingate | 1789–1793 | New Hampshire | Anti |
| Robert Charles Winthrop | 1850–1851 | Massachusetts | Whig |
| Tim Wirth | 1987–1993 | Colorado | Dem |
| Garrett L. Withers | 1949–1950 | Kentucky | Dem |
| Robert E. Withers | 1875–1881 | Virginia | Dem |
| Harris Wofford | 1991–1995 | Pennsylvania | Dem |
| Thomas A. Wofford | 1956 | South Carolina | Dem |
| Edward O. Wolcott | 1889–1901 | Colorado | Rep |
| Josiah O. Wolcott | 1917–1921 | Delaware | Dem |
| William Woodbridge | 1841–1847 | Michigan | Whig |
| Levi Woodbury | 1825–1831 1841–1845 | New Hampshire | Dem |
| John D. Works | 1911–1917 | Kalifornien | Rep |
| Thomas Worthington | 1803–1807 1810–1814 | Ohio | DemRep |
| George G. Wright | 1871–1877 | Iowa | Rep |
| Joseph A. Wright | 1862–1863 | Indiana | Dem |
| Robert Wright | 1801–1806 | Maryland | DemRep |
| Silas Wright | 1833–1844 | New York | Dem |
| William Wright | 1853–1859 1863–1866 | New Jersey | Dem |
| Ron Wyden | 1997– | Oregon | Dem |
| Louis C. Wyman | 1975 | New Hampshire | Rep |

### Y

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Ralph Yarborough | 1957–1971 | Texas | Dem |
| Richard Yates | 1865–1871 | Illinois | Rep |
| Lafayette Young | 1910–1911 | Iowa | Rep |
| Milton Young | 1945–1981 | North Dakota | Rep |
| Richard M. Young | 1837–1843 | Illinois | Dem |
| Stephen M. Young | 1959–1971 | Ohio | Dem |
| Todd Young | 2017– | Indiana | Rep |
| David Levy Yulee | 1845–1851 1855–1861 | Florida | Dem |

### Z

| Senator | Amtszeit(en) | Bundesstaat | Partei |
| Edward Zorinsky | 1977–1987 | Nebraska | Dem |

## Parteien

Weiterführende Informationen zu den teilweise heute nicht mehr existierenden Parteien, denen die Senatoren angehörten, finden sich im Artikel Politische Parteien der Vereinigten Staaten. In der Liste werden folgende Kürzel verwendet, die aktuell (Stand 2023) im Senat vertretenen Parteien sind gefettet. Bei Unabhängigen und Senatoren kleinerer Parteien ist in Klammern die unterstützende bzw. unterstützte Partei vermerkt, soweit bekannt.
* Unabh: Unabhängiger
* Pro: Pro-Administration Party, bis etwa 1792 (keine Partei im modernen Sinn), entwickelte sich zur Föderalistischen Partei
* Anti: Anti-Administration Party, bis etwa 1792 (keine Partei im modernen Sinn), entwickelte sich zur Demokratisch-Republikanischen Partei
* Föd: Föderalistische Partei, etwa 1791 bis 1820
* DemRep: Demokratisch-Republikanische Partei, auch Jeffersonian Republicans, etwa 1792 bis 1828
* Dem: Demokratische Partei, seit 1828, auch Anhänger Jacksons vor 1828
** DFL: Minnesota Democratic-Farmer-Labor Party, seit 1944 Teil der Demokraten, vorher FLP
* Null: Nullifier Party, etwa 1828 bis 1836
* NatRep: National Republican Party, etwa 1830 bis 1832, auch Gegner Jacksons vor 1830
* Whig: United States Whig Party, etwa 1833 bis 1860
* Law: Law and Order Party of Rhode Island, etwa 1842 bis 1845
* Free Soil: Free Soil Party, 1848 bis 1856
* Am: Know-Nothing Party oder American Party, etwa 1854 bis 1860
* Rep: Republikanische Partei, seit 1854
* Union: Unionistische Partei, Unionist Party und Unconditional Union Party, 1861 bis 1867
* Pop: Populist Party oder People’s Party, etwa 1870 bis 1908
* AMon: Anti-Monopoly Party, etwa 1870 bis 1885
* LibRep: Liberal Republican Party, etwa 1872 bis 1875
* Readj: Readjuster Party, 1877 bis 1895
* Silver: Silver Party, etwa 1892 bis 1902
* SilRep: Silver Republican Party, 1896 bis 1901
* Prog: Progressive Party (1912), 1912 bis 1916 sowie Progressive Party (1924), 1924 bis 1946
* FLP: Bauern- und Arbeiterpartei von Minnesota oder Farmer-Labor Party of Minnesota, 1918 bis 1944, seitdem DFL
* Con: Conservative Party of New York State, seit 1962
* IPM: Independence Party of Minnesota, seit 1992