# List of United States senators from Louisiana

Louisiana was admitted to the Union on April 30, 1812, and elects senators to class 2 and class 3. Its current senators are Republicans Bill Cassidy and John Kennedy. Russell Long was the state's longest serving senator, served 1948–1987. Louisiana is one of fifteen states alongside California, Colorado, Florida, Georgia, Hawaii, Idaho, Maine, Massachusetts, Minnesota, Missouri, Nevada, Pennsylvania, South Dakota and Utah to have a younger senior senator and an older junior senator.

## List of senators

| Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | C | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. |
| # | Senator | Party | Dates in office | Electoral history | T | C | T | Electoral history | Dates in office | Party | Senator | # |
| Vacant | Vacant | Vacant | Apr 30, 1812 – Sep 3, 1812 | Louisiana did not elect its senators until four months after statehood. | 1 | 12th | 1 | Louisiana did not elect its senators until four months after statehood. | Apr 30, 1812 – Sep 3, 1812 | Vacant | Vacant | Vacant |
| 1 | Jean Noël Destréhan | Democratic- Republican | Sep 3, 1812 – Oct 1, 1812 | Resigned | 1 | 12th | 1 | Elected in 1812. | Sep 3, 1812 – Mar 3, 1813 | Democratic- Republican | Allan B. Magruder | 1 |
| Vacant | Vacant | Vacant | Oct 1, 1812 – Oct 8, 1812 | | 1 | 12th | 1 | Elected in 1812. | Sep 3, 1812 – Mar 3, 1813 | Democratic- Republican | Allan B. Magruder | 1 |
| 2 | Thomas Posey | Democratic- Republican | Oct 8, 1812 – Feb 4, 1813 | Appointed to continue Destréhan's term.Lost election to finish Destréhan's term. | 1 | 12th | 1 | Elected in 1812. | Sep 3, 1812 – Mar 3, 1813 | Democratic- Republican | Allan B. Magruder | 1 |
| 3 | James Brown | Democratic- Republican | Feb 5, 1813 – Mar 3, 1817 | Elected to finish Destréhan's term.Lost election to full term. | 1 | 12th | 1 | Elected in 1812. | Sep 3, 1812 – Mar 3, 1813 | Democratic- Republican | Allan B. Magruder | 1 |
| 3 | James Brown | Democratic- Republican | Feb 5, 1813 – Mar 3, 1817 | Elected to finish Destréhan's term.Lost election to full term. | 1 | 13th | 2 | Elected in 1813 Retired. | Mar 4, 1813 – Mar 3, 1819 | Democratic- Republican | Eligius Fromentin | 2 |
| 3 | James Brown | Democratic- Republican | Feb 5, 1813 – Mar 3, 1817 | Elected to finish Destréhan's term.Lost election to full term. | 1 | 14th | 2 | Elected in 1813 Retired. | Mar 4, 1813 – Mar 3, 1819 | Democratic- Republican | Eligius Fromentin | 2 |
| 4 | William C. C. Claiborne | Democratic- Republican | Mar 4, 1817 – Nov 23, 1817 | Elected in 1817.Died. | 2 | 15th | 2 | Elected in 1813 Retired. | Mar 4, 1813 – Mar 3, 1819 | Democratic- Republican | Eligius Fromentin | 2 |
| Vacant | Vacant | Vacant | Nov 23, 1817 – Jan 12, 1818 | | 2 | 15th | 2 | Elected in 1813 Retired. | Mar 4, 1813 – Mar 3, 1819 | Democratic- Republican | Eligius Fromentin | 2 |
| 5 | Henry Johnson | Democratic- Republican | Jan 12, 1818 – May 27, 1824 | Elected to finish Claiborne's term. | 2 | 15th | 2 | Elected in 1813 Retired. | Mar 4, 1813 – Mar 3, 1819 | Democratic- Republican | Eligius Fromentin | 2 |
| 5 | Henry Johnson | Democratic- Republican | Jan 12, 1818 – May 27, 1824 | Elected to finish Claiborne's term. | 2 | 16th | 3 | Elected in 1819.Resigned to become U.S. Minister to France. | Mar 4, 1819 – Dec 10, 1823 | Democratic- Republican | James Brown | 3 |
| 5 | Henry Johnson | Democratic- Republican | Jan 12, 1818 – May 27, 1824 | Elected to finish Claiborne's term. | 2 | 17th | 3 | Elected in 1819.Resigned to become U.S. Minister to France. | Mar 4, 1819 – Dec 10, 1823 | Democratic- Republican | James Brown | 3 |
| 5 | Henry Johnson | Democratic- Republican | Jan 12, 1818 – May 27, 1824 | Elected to full term in 1823.Resigned to become Governor of Louisiana. | 3 | 18th | 3 | Elected in 1819.Resigned to become U.S. Minister to France. | Mar 4, 1819 – Dec 10, 1823 | Democratic- Republican | James Brown | 3 |
| 5 | Henry Johnson | Democratic- Republican | Jan 12, 1818 – May 27, 1824 | Elected to full term in 1823.Resigned to become Governor of Louisiana. | 3 | 18th | 3 | | Dec 10, 1823 – Jan 15, 1824 | Vacant | Vacant | Vacant |
| 5 | Henry Johnson | Democratic- Republican | Jan 12, 1818 – May 27, 1824 | Elected to full term in 1823.Resigned to become Governor of Louisiana. | 3 | 18th | 3 | Elected to finish Brown's term. | Jan 15, 1824 – May 19, 1833 | Democratic- Republican | Josiah S. Johnston | 4 |
| Vacant | Vacant | Vacant | May 27, 1824 – Nov 19, 1824 | | 3 | 18th | 3 | Elected to finish Brown's term. | Jan 15, 1824 – May 19, 1833 | Democratic- Republican | Josiah S. Johnston | 4 |
| 6 | Dominique Bouligny | Democratic- Republican | Nov 19, 1824 – Mar 3, 1829 | Elected to finish Johnson's term. | 3 | 18th | 3 | Elected to finish Brown's term. | Jan 15, 1824 – May 19, 1833 | Democratic- Republican | Josiah S. Johnston | 4 |
| 6 | Dominique Bouligny | National Republican | Nov 19, 1824 – Mar 3, 1829 | Elected to finish Johnson's term. | 3 | 19th | 4 | Elected to full term in 1825. | Jan 15, 1824 – May 19, 1833 | National Republican | Josiah S. Johnston | 4 |
| 6 | Dominique Bouligny | National Republican | Nov 19, 1824 – Mar 3, 1829 | Elected to finish Johnson's term. | 3 | 20th | 4 | Elected to full term in 1825. | Jan 15, 1824 – May 19, 1833 | National Republican | Josiah S. Johnston | 4 |
| 7 | Edward Livingston | Jacksonian | Mar 4, 1829 – May 24, 1831 | Elected in 1829.Resigned to become U.S. Secretary of State. | 4 | 21st | 4 | Elected to full term in 1825. | Jan 15, 1824 – May 19, 1833 | National Republican | Josiah S. Johnston | 4 |
| 7 | Edward Livingston | Jacksonian | Mar 4, 1829 – May 24, 1831 | Elected in 1829.Resigned to become U.S. Secretary of State. | 4 | 22nd | 5 | Re-elected in 1831.Died. | Jan 15, 1824 – May 19, 1833 | National Republican | Josiah S. Johnston | 4 |
| Vacant | Vacant | Vacant | May 24, 1831 – Nov 15, 1831 | | 4 | 22nd | 5 | Re-elected in 1831.Died. | Jan 15, 1824 – May 19, 1833 | National Republican | Josiah S. Johnston | 4 |
| 8 | George A. Waggaman | National Republican | Nov 15, 1831 – Mar 3, 1835 | Elected to finish Livingston's term. | 4 | 22nd | 5 | Re-elected in 1831.Died. | Jan 15, 1824 – May 19, 1833 | National Republican | Josiah S. Johnston | 4 |
| 8 | George A. Waggaman | National Republican | Nov 15, 1831 – Mar 3, 1835 | Elected to finish Livingston's term. | 4 | 23rd | 5 | Re-elected in 1831.Died. | Jan 15, 1824 – May 19, 1833 | National Republican | Josiah S. Johnston | 4 |
| 8 | George A. Waggaman | National Republican | Nov 15, 1831 – Mar 3, 1835 | Elected to finish Livingston's term. | 4 | 23rd | 5 | | May 19, 1833 – Dec 19, 1833 | Vacant | Vacant | Vacant |
| 8 | George A. Waggaman | National Republican | Nov 15, 1831 – Mar 3, 1835 | Elected to finish Livingston's term. | 4 | 23rd | 5 | Elected to finish Johnston's term.Resigned due to ill health. | Dec 19, 1833 – Jan 5, 1837 | National Republican | Alexander Porter | 5 |
| Vacant | Vacant | Vacant | Mar 4, 1835 – Jan 13, 1836 | Charles Gayarré (J) was elected in 1835, but resigned due to ill health. | 5 | 24th | 5 | Elected to finish Johnston's term.Resigned due to ill health. | Dec 19, 1833 – Jan 5, 1837 | National Republican | Alexander Porter | 5 |
| 9 | Robert C. Nicholas | Jacksonian | Jan 13, 1836 – Mar 3, 1841 | Elected to finish Gauarré's term.[data missing] | 5 | 24th | 5 | Elected to finish Johnston's term.Resigned due to ill health. | Dec 19, 1833 – Jan 5, 1837 | National Republican | Alexander Porter | 5 |
| 9 | Robert C. Nicholas | Jacksonian | Jan 13, 1836 – Mar 3, 1841 | Elected to finish Gauarré's term.[data missing] | 5 | 24th | 5 | | Jan 5, 1837 – Jan 12, 1837 | Vacant | Vacant | Vacant |
| 9 | Robert C. Nicholas | Jacksonian | Jan 13, 1836 – Mar 3, 1841 | Elected to finish Gauarré's term.[data missing] | 5 | 24th | 5 | Elected to finish Porter's term. | Jan 12, 1837 – Mar 1, 1842 | Jacksonian | Alexandre Mouton | 6 |
| 9 | Robert C. Nicholas | Democratic | Jan 13, 1836 – Mar 3, 1841 | Elected to finish Gauarré's term.[data missing] | 5 | 25th | 6 | Re-elected in 1837.Resigned. | Jan 12, 1837 – Mar 1, 1842 | Democratic | Alexandre Mouton | 6 |
| 9 | Robert C. Nicholas | Democratic | Jan 13, 1836 – Mar 3, 1841 | Elected to finish Gauarré's term.[data missing] | 5 | 26th | 6 | Re-elected in 1837.Resigned. | Jan 12, 1837 – Mar 1, 1842 | Democratic | Alexandre Mouton | 6 |
| 10 | Alexander Barrow | Whig | Mar 4, 1841 – Dec 29, 1846 | Elected in 1840.Died. | 6 | 27th | 6 | Re-elected in 1837.Resigned. | Jan 12, 1837 – Mar 1, 1842 | Democratic | Alexandre Mouton | 6 |
| 10 | Alexander Barrow | Whig | Mar 4, 1841 – Dec 29, 1846 | Elected in 1840.Died. | 6 | 27th | 6 | | Mar 1, 1842 – Apr 14, 1842 | Vacant | Vacant | Vacant |
| 10 | Alexander Barrow | Whig | Mar 4, 1841 – Dec 29, 1846 | Elected in 1840.Died. | 6 | 27th | 6 | Appointed to finish Mouton's term.Lost election to full term. | Apr 14, 1842 – Mar 3, 1843 | Whig | Charles Conrad | 7 |
| 10 | Alexander Barrow | Whig | Mar 4, 1841 – Dec 29, 1846 | Elected in 1840.Died. | 6 | 28th | 7 | Elected in 1843, but due to ill health did not take his seat.Died. | Mar 4, 1843 – Jan 13, 1844 | Whig | Alexander Porter | 8 |
| 10 | Alexander Barrow | Whig | Mar 4, 1841 – Dec 29, 1846 | Elected in 1840.Died. | 6 | 28th | 7 | | Jan 13, 1844 – Feb 12, 1844 | Vacant | Vacant | Vacant |
| 10 | Alexander Barrow | Whig | Mar 4, 1841 – Dec 29, 1846 | Elected in 1840.Died. | 6 | 28th | 7 | Elected to finish Porter's termLost election to full term in 1849. | Feb 12, 1844 – Mar 3, 1849 | Whig | Henry Johnson | 9 |
| 10 | Alexander Barrow | Whig | Mar 4, 1841 – Dec 29, 1846 | Elected in 1840.Died. | 6 | 29th | 7 | Elected to finish Porter's termLost election to full term in 1849. | Feb 12, 1844 – Mar 3, 1849 | Whig | Henry Johnson | 9 |
| Vacant | Vacant | Vacant | Dec 29, 1846 – Jan 21, 1847 | | 6 | 29th | 7 | Elected to finish Porter's termLost election to full term in 1849. | Feb 12, 1844 – Mar 3, 1849 | Whig | Henry Johnson | 9 |
| 11 | Pierre Soulé | Democratic | Jan 21, 1847 – Mar 3, 1847 | Elected to finish Barrow's term.[data missing] | 6 | 29th | 7 | Elected to finish Porter's termLost election to full term in 1849. | Feb 12, 1844 – Mar 3, 1849 | Whig | Henry Johnson | 9 |
| 12 | Solomon W. Downs | Democratic | Mar 4, 1847 – Mar 3, 1853 | Elected in 1847.Lost re-election. | 7 | 30th | 7 | Elected to finish Porter's termLost election to full term in 1849. | Feb 12, 1844 – Mar 3, 1849 | Whig | Henry Johnson | 9 |
| 12 | Solomon W. Downs | Democratic | Mar 4, 1847 – Mar 3, 1853 | Elected in 1847.Lost re-election. | 7 | 31st | 8 | Elected in 1848.Resigned to become U.S. Minister to Spain. | Mar 3, 1849 – Apr 11, 1853 | Democratic | Pierre Soulé | 10 |
| 12 | Solomon W. Downs | Democratic | Mar 4, 1847 – Mar 3, 1853 | Elected in 1847.Lost re-election. | 7 | 32nd | 8 | Elected in 1848.Resigned to become U.S. Minister to Spain. | Mar 3, 1849 – Apr 11, 1853 | Democratic | Pierre Soulé | 10 |
| 13 | Judah P. Benjamin | Whig | Mar 4, 1853 – Feb 4, 1861 | Elected in 1852. | 8 | 33rd | 8 | Elected in 1848.Resigned to become U.S. Minister to Spain. | Mar 3, 1849 – Apr 11, 1853 | Democratic | Pierre Soulé | 10 |
| 13 | Judah P. Benjamin | Whig | Mar 4, 1853 – Feb 4, 1861 | Elected in 1852. | 8 | 33rd | 8 | | Apr 11, 1853 – Dec 5, 1853 | Vacant | Vacant | Vacant |
| 13 | Judah P. Benjamin | Whig | Mar 4, 1853 – Feb 4, 1861 | Elected in 1852. | 8 | 33rd | 8 | Elected to finish Soulé's term. | Dec 5, 1853 – Feb 4, 1861 | Democratic | John Slidell | 11 |
| 13 | Judah P. Benjamin | Whig | Mar 4, 1853 – Feb 4, 1861 | Elected in 1852. | 8 | 34th | 9 | Re-election year unknown.Resigned. | Dec 5, 1853 – Feb 4, 1861 | Democratic | John Slidell | 11 |
| 13 | Judah P. Benjamin | Democratic | Mar 4, 1853 – Feb 4, 1861 | Elected in 1852. | 8 | 35th | 9 | Re-election year unknown.Resigned. | Dec 5, 1853 – Feb 4, 1861 | Democratic | John Slidell | 11 |
| 13 | Judah P. Benjamin | Democratic | Mar 4, 1853 – Feb 4, 1861 | Re-elected in 1859.Withdrew. | 9 | 36th | 9 | Re-election year unknown.Resigned. | Dec 5, 1853 – Feb 4, 1861 | Democratic | John Slidell | 11 |
| Vacant | Vacant | Vacant | Feb 4, 1861 – Jul 8, 1868 | Civil War and Reconstruction | 9 | 36th | 9 | Civil War and Reconstruction | Feb 4, 1861 – Jul 9, 1868 | Vacant | Vacant | Vacant |
| Vacant | Vacant | Vacant | Feb 4, 1861 – Jul 8, 1868 | Civil War and Reconstruction | 9 | 37th | 10 | Civil War and Reconstruction | Feb 4, 1861 – Jul 9, 1868 | Vacant | Vacant | Vacant |
| Vacant | Vacant | Vacant | Feb 4, 1861 – Jul 8, 1868 | Civil War and Reconstruction | 9 | 38th | 10 | Civil War and Reconstruction | Feb 4, 1861 – Jul 9, 1868 | Vacant | Vacant | Vacant |
| Vacant | Vacant | Vacant | Feb 4, 1861 – Jul 8, 1868 | Civil War and Reconstruction | 10 | 39th | 10 | Civil War and Reconstruction | Feb 4, 1861 – Jul 9, 1868 | Vacant | Vacant | Vacant |
| Vacant | Vacant | Vacant | Feb 4, 1861 – Jul 8, 1868 | Civil War and Reconstruction | 10 | 40th | 11 | Civil War and Reconstruction | Feb 4, 1861 – Jul 9, 1868 | Vacant | Vacant | Vacant |
| 14 | John S. Harris | Republican | Jul 8, 1868 – Mar 3, 1871 | Elected to finish incomplete term in 1868.[data missing]. | 10 | 40th | 11 | Civil War and Reconstruction | Feb 4, 1861 – Jul 9, 1868 | Vacant | Vacant | Vacant |
| 14 | John S. Harris | Republican | Jul 8, 1868 – Mar 3, 1871 | Elected to finish incomplete term in 1868.[data missing]. | 10 | 40th | 11 | Elected to finish incomplete term.Resigned to become Governor of Louisiana. | Jul 9, 1868 – Nov 1, 1872 | Republican | William Pitt Kellogg | 12 |
| 14 | John S. Harris | Republican | Jul 8, 1868 – Mar 3, 1871 | Elected to finish incomplete term in 1868.[data missing]. | 10 | 41st | 11 | Elected to finish incomplete term.Resigned to become Governor of Louisiana. | Jul 9, 1868 – Nov 1, 1872 | Republican | William Pitt Kellogg | 12 |
| 15 | J. R. West | Republican | Mar 4, 1871 – Mar 3, 1877 | Election year unknown.Retired. | 11 | 42nd | 11 | Elected to finish incomplete term.Resigned to become Governor of Louisiana. | Jul 9, 1868 – Nov 1, 1872 | Republican | William Pitt Kellogg | 12 |
| 15 | J. R. West | Republican | Mar 4, 1871 – Mar 3, 1877 | Election year unknown.Retired. | 11 | 42nd | 11 | Senate declined to seat rival claimants William L. McMillen and P. B. S. Pinchback | Nov 1, 1872 – Jan 12, 1876 | Vacant | Vacant | Vacant |
| 15 | J. R. West | Republican | Mar 4, 1871 – Mar 3, 1877 | Election year unknown.Retired. | 11 | 43rd | 12 | Senate declined to seat rival claimants William L. McMillen and P. B. S. Pinchback | Nov 1, 1872 – Jan 12, 1876 | Vacant | Vacant | Vacant |
| 15 | J. R. West | Republican | Mar 4, 1871 – Mar 3, 1877 | Election year unknown.Retired. | 11 | 44th | 12 | Senate declined to seat rival claimants William L. McMillen and P. B. S. Pinchback | Nov 1, 1872 – Jan 12, 1876 | Vacant | Vacant | Vacant |
| 15 | J. R. West | Republican | Mar 4, 1871 – Mar 3, 1877 | Election year unknown.Retired. | 11 | 44th | 12 | Elected to finish incomplete term in 1876.Lost re-election. | Jan 12, 1876 – Mar 3, 1879 | Democratic | James B. Eustis | 13 |
| 16 | William Pitt Kellogg | Republican | Mar 4, 1877 – Mar 3, 1883 | Elected in 1876.Retired to run for U.S. House. | 12 | 45th | 12 | Elected to finish incomplete term in 1876.Lost re-election. | Jan 12, 1876 – Mar 3, 1879 | Democratic | James B. Eustis | 13 |
| 16 | William Pitt Kellogg | Republican | Mar 4, 1877 – Mar 3, 1883 | Elected in 1876.Retired to run for U.S. House. | 12 | 46th | 13 | Elected in 1879.Lost re-election. | Mar 4, 1879 – Mar 3, 1885 | Democratic | Benjamin F. Jonas | 14 |
| 16 | William Pitt Kellogg | Republican | Mar 4, 1877 – Mar 3, 1883 | Elected in 1876.Retired to run for U.S. House. | 12 | 47th | 13 | Elected in 1879.Lost re-election. | Mar 4, 1879 – Mar 3, 1885 | Democratic | Benjamin F. Jonas | 14 |
| 17 | Randall L. Gibson | Democratic | Mar 4, 1883 – Dec 15, 1892 | Elected in 1882. | 13 | 48th | 13 | Elected in 1879.Lost re-election. | Mar 4, 1879 – Mar 3, 1885 | Democratic | Benjamin F. Jonas | 14 |
| 17 | Randall L. Gibson | Democratic | Mar 4, 1883 – Dec 15, 1892 | Elected in 1882. | 13 | 49th | 14 | Election year unknown.Retired. | Mar 4, 1885 – Mar 3, 1891 | Democratic | James B. Eustis | 15 |
| 17 | Randall L. Gibson | Democratic | Mar 4, 1883 – Dec 15, 1892 | Elected in 1882. | 13 | 50th | 14 | Election year unknown.Retired. | Mar 4, 1885 – Mar 3, 1891 | Democratic | James B. Eustis | 15 |
| 17 | Randall L. Gibson | Democratic | Mar 4, 1883 – Dec 15, 1892 | Re-elected in 1889.Died. | 14 | 51st | 14 | Election year unknown.Retired. | Mar 4, 1885 – Mar 3, 1891 | Democratic | James B. Eustis | 15 |
| 17 | Randall L. Gibson | Democratic | Mar 4, 1883 – Dec 15, 1892 | Re-elected in 1889.Died. | 14 | 52nd | 15 | Elected in 1891.Resigned to become U.S. Supreme Court Justice. | Mar 4, 1891 – Mar 12, 1894 | Democratic | Edward Douglass White | 16 |
| Vacant | Vacant | Vacant | Dec 15, 1892 – Dec 31, 1892 | | 14 | 52nd | 15 | Elected in 1891.Resigned to become U.S. Supreme Court Justice. | Mar 4, 1891 – Mar 12, 1894 | Democratic | Edward Douglass White | 16 |
| 18 | Donelson Caffery | Democratic | Dec 31, 1892 – Mar 3, 1901 | Appointed to continue Gibson's term.Elected in 1894 to finish Gibson's term. | 14 | 52nd | 15 | Elected in 1891.Resigned to become U.S. Supreme Court Justice. | Mar 4, 1891 – Mar 12, 1894 | Democratic | Edward Douglass White | 16 |
| 18 | Donelson Caffery | Democratic | Dec 31, 1892 – Mar 3, 1901 | Appointed to continue Gibson's term.Elected in 1894 to finish Gibson's term. | 14 | 53rd | 15 | Elected in 1891.Resigned to become U.S. Supreme Court Justice. | Mar 4, 1891 – Mar 12, 1894 | Democratic | Edward Douglass White | 16 |
| 18 | Donelson Caffery | Democratic | Dec 31, 1892 – Mar 3, 1901 | Appointed to continue Gibson's term.Elected in 1894 to finish Gibson's term. | 14 | 53rd | 15 | Appointed to continue White's term.Elected in 1894 to finish White's term.Retired. | Mar 12, 1894 – Mar 3, 1897 | Democratic | Newton C. Blanchard | 17 |
| 18 | Donelson Caffery | Democratic | Dec 31, 1892 – Mar 3, 1901 | Elected in 1894 to the next term, before election to finish Gibson's term.Retired. | 15 | 54th | 15 | Appointed to continue White's term.Elected in 1894 to finish White's term.Retired. | Mar 12, 1894 – Mar 3, 1897 | Democratic | Newton C. Blanchard | 17 |
| 18 | Donelson Caffery | Democratic | Dec 31, 1892 – Mar 3, 1901 | Elected in 1894 to the next term, before election to finish Gibson's term.Retired. | 15 | 55th | 16 | Elected in 1896. | Mar 4, 1897 – Jun 28, 1910 | Democratic | Samuel D. McEnery | 18 |
| 18 | Donelson Caffery | Democratic | Dec 31, 1892 – Mar 3, 1901 | Elected in 1894 to the next term, before election to finish Gibson's term.Retired. | 15 | 56th | 16 | Elected in 1896. | Mar 4, 1897 – Jun 28, 1910 | Democratic | Samuel D. McEnery | 18 |
| 19 | Murphy J. Foster | Democratic | Mar 4, 1901 – Mar 3, 1913 | Elected in 1900. | 16 | 57th | 16 | Elected in 1896. | Mar 4, 1897 – Jun 28, 1910 | Democratic | Samuel D. McEnery | 18 |
| 19 | Murphy J. Foster | Democratic | Mar 4, 1901 – Mar 3, 1913 | Elected in 1900. | 16 | 58th | 17 | Re-elected early in 1900. | Mar 4, 1897 – Jun 28, 1910 | Democratic | Samuel D. McEnery | 18 |
| 19 | Murphy J. Foster | Democratic | Mar 4, 1901 – Mar 3, 1913 | Elected in 1900. | 16 | 59th | 17 | Re-elected early in 1900. | Mar 4, 1897 – Jun 28, 1910 | Democratic | Samuel D. McEnery | 18 |
| 19 | Murphy J. Foster | Democratic | Mar 4, 1901 – Mar 3, 1913 | Re-elected early in 1904.Lost renomination. | 17 | 60th | 17 | Re-elected early in 1900. | Mar 4, 1897 – Jun 28, 1910 | Democratic | Samuel D. McEnery | 18 |
| 19 | Murphy J. Foster | Democratic | Mar 4, 1901 – Mar 3, 1913 | Re-elected early in 1904.Lost renomination. | 17 | 61st | 18 | Re-elected in 1908.Died. | Mar 4, 1897 – Jun 28, 1910 | Democratic | Samuel D. McEnery | 18 |
| 19 | Murphy J. Foster | Democratic | Mar 4, 1901 – Mar 3, 1913 | Re-elected early in 1904.Lost renomination. | 17 | 61st | 18 | | Jun 28, 1910 – Dec 7, 1910 | Vacant | Vacant | Vacant |
| 19 | Murphy J. Foster | Democratic | Mar 4, 1901 – Mar 3, 1913 | Re-elected early in 1904.Lost renomination. | 17 | 61st | 18 | Elected to finish McEnery's term.Retired. | Dec 7, 1910 – Mar 3, 1915 | Democratic | John Thornton | 19 |
| 19 | Murphy J. Foster | Democratic | Mar 4, 1901 – Mar 3, 1913 | Re-elected early in 1904.Lost renomination. | 17 | 62nd | 18 | Elected to finish McEnery's term.Retired. | Dec 7, 1910 – Mar 3, 1915 | Democratic | John Thornton | 19 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Elected in 1912. | 18 | 63rd | 18 | Elected to finish McEnery's term.Retired. | Dec 7, 1910 – Mar 3, 1915 | Democratic | John Thornton | 19 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Elected in 1912. | 18 | 64th | 19 | Elected early in 1912.Died. | Mar 4, 1915 – Apr 12, 1918 | Democratic | Robert F. Broussard | 20 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Elected in 1912. | 18 | 65th | 19 | Elected early in 1912.Died. | Mar 4, 1915 – Apr 12, 1918 | Democratic | Robert F. Broussard | 20 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Elected in 1912. | 18 | 65th | 19 | | Apr 12, 1918 – Apr 22, 1918 | Vacant | Vacant | Vacant |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Elected in 1912. | 18 | 65th | 19 | Appointed to continue Broussard's term.Retired when elected successor qualified. | Apr 22, 1918 – Nov 5, 1918 | Democratic | Walter Guion | 21 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Elected in 1912. | 18 | 65th | 19 | Elected to finish Broussard's term.Retired. | Nov 6, 1918 – Mar 3, 1921 | Democratic | Edward J. Gay | 22 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Re-elected in 1918. | 19 | 66th | 19 | Elected to finish Broussard's term.Retired. | Nov 6, 1918 – Mar 3, 1921 | Democratic | Edward J. Gay | 22 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Re-elected in 1918. | 19 | 67th | 20 | Elected in 1920. | Mar 4, 1921 – Mar 3, 1933 | Democratic | Edwin S. Broussard | 23 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Re-elected in 1918. | 19 | 68th | 20 | Elected in 1920. | Mar 4, 1921 – Mar 3, 1933 | Democratic | Edwin S. Broussard | 23 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Re-elected in 1924.Lost renomination. | 20 | 69th | 20 | Elected in 1920. | Mar 4, 1921 – Mar 3, 1933 | Democratic | Edwin S. Broussard | 23 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Re-elected in 1924.Lost renomination. | 20 | 70th | 21 | Re-elected in 1926.Lost renomination. | Mar 4, 1921 – Mar 3, 1933 | Democratic | Edwin S. Broussard | 23 |
| 20 | Joseph E. Ransdell | Democratic | Mar 4, 1913 – Mar 3, 1931 | Re-elected in 1924.Lost renomination. | 20 | 71st | 21 | Re-elected in 1926.Lost renomination. | Mar 4, 1921 – Mar 3, 1933 | Democratic | Edwin S. Broussard | 23 |
| Vacant | Vacant | Vacant | Mar 4, 1931 – Jan 25, 1932 | | 21 | 72nd | 21 | Re-elected in 1926.Lost renomination. | Mar 4, 1921 – Mar 3, 1933 | Democratic | Edwin S. Broussard | 23 |
| 21 | Huey Long | Democratic | Jan 25, 1932 – Sep 10, 1935 | Elected in 1930, but continued to serve as Louisiana governor until Jan 25, 1932.Assassinated. | 21 | 72nd | 21 | Re-elected in 1926.Lost renomination. | Mar 4, 1921 – Mar 3, 1933 | Democratic | Edwin S. Broussard | 23 |
| 21 | Huey Long | Democratic | Jan 25, 1932 – Sep 10, 1935 | Elected in 1930, but continued to serve as Louisiana governor until Jan 25, 1932.Assassinated. | 21 | 73rd | 22 | Elected in 1932. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 21 | Huey Long | Democratic | Jan 25, 1932 – Sep 10, 1935 | Elected in 1930, but continued to serve as Louisiana governor until Jan 25, 1932.Assassinated. | 21 | 74th | 22 | Elected in 1932. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| Vacant | Vacant | Vacant | Sep 10, 1935 – Jan 31, 1936 | | 21 | 74th | 22 | Elected in 1932. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 22 | Rose M. Long | Democratic | Jan 31, 1936 – Jan 3, 1937 | Appointed to continue her husband's term.Elected in 1936 to finish her husband's term.Retired. | 21 | 74th | 22 | Elected in 1932. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Elected in 1936. | 22 | 75th | 22 | Elected in 1932. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Elected in 1936. | 22 | 76th | 23 | Re-elected in 1938. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Elected in 1936. | 22 | 77th | 23 | Re-elected in 1938. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1942. | 23 | 78th | 23 | Re-elected in 1938. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1942. | 23 | 79th | 24 | Re-elected in 1944.Died. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1942. | 23 | 80th | 24 | Re-elected in 1944.Died. | Mar 4, 1933 – May 14, 1948 | Democratic | John Overton | 24 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1942. | 23 | 80th | 24 | | May 14, 1948 – May 18, 1948 | Vacant | Vacant | Vacant |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1942. | 23 | 80th | 24 | Appointed to continue Overton's term.Retired when elected successor qualified. | May 18, 1948 – Dec 30, 1948 | Democratic | William C. Feazel | 25 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1942. | 23 | 80th | 24 | Elected to finish Overton's term. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1948. | 24 | 81st | 24 | Elected to finish Overton's term. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1948. | 24 | 82nd | 25 | Re-elected in 1950. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1948. | 24 | 83rd | 25 | Re-elected in 1950. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1954. | 25 | 84th | 25 | Re-elected in 1950. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1954. | 25 | 85th | 26 | Re-elected in 1956. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1954. | 25 | 86th | 26 | Re-elected in 1956. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1960. | 26 | 87th | 26 | Re-elected in 1956. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1960. | 26 | 88th | 27 | Re-elected in 1962. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1960. | 26 | 89th | 27 | Re-elected in 1962. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1966.Died. | 27 | 90th | 27 | Re-elected in 1962. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1966.Died. | 27 | 91st | 28 | Re-elected in 1968. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 23 | Allen Ellender | Democratic | Jan 3, 1937 – July 27, 1972 | Re-elected in 1966.Died. | 27 | 92nd | 28 | Re-elected in 1968. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| Vacant | Vacant | Vacant | Jul 27, 1972 – Aug 1, 1972 | | 27 | 92nd | 28 | Re-elected in 1968. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 24 | Elaine Edwards | Democratic | Aug 1, 1972 – Nov 13, 1972 | Appointed by her husband to continue Ellender's term.Retired when successor qualified and resigned early. | 27 | 92nd | 28 | Re-elected in 1968. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Appointed to finish Ellender's term, having already been elected to the next term. | 27 | 92nd | 28 | Re-elected in 1968. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Elected in 1972. | 28 | 93rd | 28 | Re-elected in 1968. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Elected in 1972. | 28 | 94th | 29 | Re-elected in 1974. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Elected in 1972. | 28 | 95th | 29 | Re-elected in 1974. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1978. | 29 | 96th | 29 | Re-elected in 1974. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1978. | 29 | 97th | 30 | Re-elected in 1980.Retired. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1978. | 29 | 98th | 30 | Re-elected in 1980.Retired. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1984. | 30 | 99th | 30 | Re-elected in 1980.Retired. | Dec 31, 1948 – Jan 3, 1987 | Democratic | Russell Long | 26 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1984. | 30 | 100th | 31 | Elected in 1986. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1984. | 30 | 101st | 31 | Elected in 1986. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1990.Retired. | 31 | 102nd | 31 | Elected in 1986. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1990.Retired. | 31 | 103rd | 32 | Re-elected in 1992. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 25 | J. Bennett Johnston | Democratic | Nov 14, 1972 – Jan 3, 1997 | Re-elected in 1990.Retired. | 31 | 104th | 32 | Re-elected in 1992. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Elected in 1996. | 32 | 105th | 32 | Re-elected in 1992. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Elected in 1996. | 32 | 106th | 33 | Re-elected in 1998.Retired. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Elected in 1996. | 32 | 107th | 33 | Re-elected in 1998.Retired. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Re-elected in 2002 in runoff election. | 33 | 108th | 33 | Re-elected in 1998.Retired. | Jan 3, 1987 – Jan 3, 2005 | Democratic | John Breaux | 27 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Re-elected in 2002 in runoff election. | 33 | 109th | 34 | Elected in 2004. | Jan 3, 2005 – Jan 3, 2017 | Republican | David Vitter | 28 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Re-elected in 2002 in runoff election. | 33 | 110th | 34 | Elected in 2004. | Jan 3, 2005 – Jan 3, 2017 | Republican | David Vitter | 28 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Re-elected in 2008.Lost re-election. | 34 | 111th | 34 | Elected in 2004. | Jan 3, 2005 – Jan 3, 2017 | Republican | David Vitter | 28 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Re-elected in 2008.Lost re-election. | 34 | 112th | 35 | Re-elected in 2010.Retired. | Jan 3, 2005 – Jan 3, 2017 | Republican | David Vitter | 28 |
| 26 | Mary Landrieu | Democratic | Jan 3, 1997 – Jan 3, 2015 | Re-elected in 2008.Lost re-election. | 34 | 113th | 35 | Re-elected in 2010.Retired. | Jan 3, 2005 – Jan 3, 2017 | Republican | David Vitter | 28 |
| 27 | Bill Cassidy | Republican | Jan 3, 2015 – present | Elected in 2014 in runoff election. | 35 | 114th | 35 | Re-elected in 2010.Retired. | Jan 3, 2005 – Jan 3, 2017 | Republican | David Vitter | 28 |
| 27 | Bill Cassidy | Republican | Jan 3, 2015 – present | Elected in 2014 in runoff election. | 35 | 115th | 36 | Elected in 2016 in runoff election. | Jan 3, 2017 – present | Republican | John Kennedy | 29 |
| 27 | Bill Cassidy | Republican | Jan 3, 2015 – present | Elected in 2014 in runoff election. | 35 | 116th | 36 | Elected in 2016 in runoff election. | Jan 3, 2017 – present | Republican | John Kennedy | 29 |
| 27 | Bill Cassidy | Republican | Jan 3, 2015 – present | Re-elected in 2020. | 36 | 117th | 36 | Elected in 2016 in runoff election. | Jan 3, 2017 – present | Republican | John Kennedy | 29 |
| 27 | Bill Cassidy | Republican | Jan 3, 2015 – present | Re-elected in 2020. | 36 | 118th | 37 | Re-elected in 2022. | Jan 3, 2017 – present | Republican | John Kennedy | 29 |
| 27 | Bill Cassidy | Republican | Jan 3, 2015 – present | Re-elected in 2020. | 36 | 119th | 37 | Re-elected in 2022. | Jan 3, 2017 – present | Republican | John Kennedy | 29 |
| To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | 37 | 120th | 37 | Re-elected in 2022. | Jan 3, 2017 – present | Republican | John Kennedy | 29 |
| To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | 37 | 121st | 38 | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. |
| # | Senator | Party | Years in office | Electoral history | T | C | T | Electoral history | Years in office | Party | Senator | # |
| Class 2 | Class 2 | Class 2 | Class 2 | Class 2 | Class 2 | C | Class 3 | Class 3 | Class 3 | Class 3 | Class 3 | Class 3 |