| CONGRESS | SENATOR | TERM BEGAN | TERM ENDED | COMMENTS |
|---|---|---|---|---|
| Class 2 | ||||
| 12th | Jean N. Destrehan (N/A) | Sept. 3, 1812 | Oct. 1, 18121 | Resigned |
| 12th | Thomas Posey (R) | Oct. 8, 1812 | Feb. 4, 1813 | Appointed |
| 12th-14th | James Brown (R) | Feb. 5, 1813 | Mar. 3, 1817 | |
| 15th | William C.C. Claiborne (D) | Mar. 4, 1817 | Nov. 23, 1817 | Died |
| 15th-18th | Henry Johnson (R, ADAMS-CLAY R) | Jan. 12, 1818 | May 27, 1824 | Resigned |
| 18th-20th | C.J. Dominique Bouligny (ADAMS-CLAY R, ADAMS) | Nov. 19, 1824 | Mar. 3, 1829 | |
| 21st-22nd | Edward Livingston (J) | Mar. 4, 1829 | May 24, 1831 | Resigned |
| 22nd-23rd | George A. Waggaman (AJ) | Nov. 15, 1831 | Mar. 3, 1835 | |
| 24th-26th | Robert C. Nicholas (J, D) | Jan. 13, 18362 | Mar. 3, 1841 | |
| 27th-29th | Alexander Barrow (W) | Mar. 4, 1841 | Dec. 29, 1846 | Died |
| 29th | Pierre Soule (D) | Jan. 21, 1847 | Mar. 3, 1847 | |
| 30th-32nd | Solomon W. Downs (D) | Mar. 4, 1847 | Mar. 3, 1853 | |
| 33rd-36th | Judah P. Benjamin (W, OP, D) | Mar. 4, 1853 | Feb. 4, 18613 | |
| 40th-41st | John S. Harris (R) | Jul. 9, 18684 | Mar. 3, 1871 | |
| 42nd-44th | J. Rodman West (R) | Mar. 4, 1871 | Mar. 3, 1877 | |
| 45th-47th | William P. Kellogg (R) | Mar. 4, 1877 | Mar. 3, 1883 | |
| 48th-53rd | Randall L. Gibson (D) | Mar. 4, 1883 | Dec. 15, 1892 | Died |
| 52nd-56th | Donelson Caffery (D) | Dec. 31, 1892 | Mar. 3, 1901 | Appointed, then elected |
| 57th-62nd | Murphy J. Foster (D) | Mar. 4, 1901 | Mar. 3, 1913 | |
| 63rd-71st | Joseph E. Ransdell (D) | Mar. 4, 1913 | Mar. 3, 1931 | |
| 72nd-74th | Huey P. Long (D) | Jan. 25, 19325 | Sept. 10, 1935 | Died |
| 74th | Rose McConnell Long (D) | Jan. 31, 1936 | Jan. 3, 1937 | Appointed, then elected |
| 75th-92nd | Allen J. Ellender (D) | Jan. 3, 1937 | Jul. 27, 1972 | Died |
| 92nd | Elaine S. Edwards6 (D) | Aug. 1, 1972 | Nov. 13, 1972 | Appointed; resigned |
| 92nd-104th | J. Bennett Johnston Jr. (D) | Nov. 14, 19727 | Jan. 3, 1997 | |
| 105th-113th | Mary L. Landrieu (D) | Jan. 3, 1997 | Jan. 3, 2015 | |
| 114th- | Bill Cassidy (R) | Jan. 3, 2015 | Present | |
| Class 3 | ||||
| 12th | Allan B. Magruder (R) | Sept. 3, 1812 | Mar. 3, 1813 | |
| 13th-15th | Eligius Fromentin (R) | Mar. 4, 1813 | Mar. 3, 1819 | |
| 16th-18th | James Brown (R, ADAMS-CLAY R) | Mar. 4, 1819 | Dec. 10, 1823 | Resigned |
| 18th-23rd | Josiah S. Johnston (ADAMS-CLAY R, ADAMS, AJ) | Jan. 15, 1824 | May 19, 1833 | Died |
| 23rd-24th | Alexander Porter (AJ) | Dec. 19, 18338 | Jan. 5, 1837 | Resigned |
| 24th-27th | Alexander Mouton (J, D) | Jan. 12, 1837 | Mar. 1, 1842 | Resigned |
| 27th | Charles M. Conrad (W) | Apr. 14, 1842 | Mar. 3, 1843 | |
| 28th-30th | Henry Johnson (W) | Feb. 12, 18449 | Mar. 3, 1849 | |
| 31st-33rd | Pierre Soule (D) | Mar. 4, 1849 | Apr. 11, 1853 | Resigned |
| 33rd-36th | John Slidell (D) | Apr. 28, 1853 | Feb. 4, 186110 | Withdrew |
| 40th-44th | William P. Kellogg11 (R) | Jul. 9, 1868 | Nov. 1, 1872 | Resigned |
| 44th-45th | James B. Eustis (D) | Jan. 12, 1876 | Mar. 3, 1879 | |
| 46th-48th | Benjamin F. Jonas (D) | Mar. 4, 1879 | Mar. 3, 1885 | |
| 49th-51st | James B. Eustis (D) | Mar. 4, 1885 | Mar. 3, 1891 | |
| 52nd-53rd | Edward D. White (D) | Mar. 4, 1891 | Mar. 12, 1894 | Resigned |
| 53rd-54th | Newton C. Blanchard (D) | Mar. 12, 1894 | Mar. 3, 1897 | Appointed, then elected |
| 55th-61st | Samuel D. McEnery (D) | Mar. 4, 1897 | Jun. 28, 1910 | Died |
| 61st-63rd | John R. Thornton (D) | Dec. 7, 1910 | Mar. 3, 1915 | |
| 64th-65th | Robert F. Broussard (D) | Mar. 4, 1915 | Apr. 12, 1918 | Died |
| 65th | Walter Guion (D) | Apr. 22, 1918 | Nov. 5, 1918 | Appointed |
| 65th-66th | Edward J. Gay (D) | Nov. 6, 1918 | Mar. 3, 1921 | |
| 67th-72nd | Edwin S. Broussard (D) | Mar. 4, 1921 | Mar. 3, 1933 | |
| 73rd-80th | John H. Overton (D) | Mar. 4, 1933 | May 14, 1948 | Died |
| 80th | William C. Feazel (D) | May 18, 1948 | Dec. 30, 1948 | Appointed |
| 80th-99th | Russell B. Long (D) | Dec. 31, 194812 | Jan. 3, 1987 | |
| 100th-108th | John B. Breaux (D) | Jan. 3, 1987 | Jan. 3, 2005 | |
| 109th-114th | David Vitter (R) | Jan. 3, 2005 | Jan. 3, 2017 | |
| 115th- | John Kennedy (R) | Jan. 3, 2017 | Present | |
1. Never sworn in. Resigned Oct. 1, 1812.
2. Elected in place of Chas. E. A. Gayarre, who did not qualify. Vacancy from Mar. 4, 1835, to Jan. 13, 1836.
3. Withdrew Feb. 4, 1861. Seat declared vacant Mar. 14, 1861. Because of Civil War, vacancy from Feb. 4, 1861, to July 9, 1868, when Louisiana was readmitted to representation in the Union.
4. Elected by legislature, to fill vacancy in term beginning Mar. 4, 1865. Seated July 17, 1868.
5. Elected Nov. 4, 1930. Governor during interim. Vacancy from Sept. 11, 1935 to Jan. 30, 1936.
6. Appointed by her husband, the governor, to fill vacancy. Resigned, effective Nov. 13, 1972.
7. Elected to six-year term commencing Jan. 3, 1973; subsequently appointed by governor to fill vacancy in term ending Jan. 3, 1973.
8. Vacancy from May 20 to Dec. 18, 1833.
9. Alexander Porter was elected for this term, but he did not present credentials nor qualify. Vacancy from Mar. 4, 1843, to Feb. 12, 1844.
10. Withdrew from the Senate Feb. 4, 1861. Because of Civil War, vacancy from Feb. 4, 1861, to July 9, 1868, when Louisiana was readmitted to representation in the Union.
11. By legislature, to fill vacancy in term beginning Mar. 4, 1867. Seated July 17, 1868. Resigned Nov. 1, 1872. Vacancy from Nov. 2, 1872, to Jan. 11, 1876.
12. Elected Nov. 2, 1948, for term ending Jan. 3, 1951. Oath administered Dec. 31, 1948.
