Class 1 Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2006, 2012, 2018, and 2024. The next election will be in 2030. | C | Class 2 Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2008, 2010 (special election), 2014, and 2020. The next election will be in 2026. |
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# | Senator | Party | Dates in office | Electoral history | T | T | Electoral history | Dates in office | Party | Senator | # |
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1 | George Read | Pro- Admin. | Mar 4, 1789 – Sep 18, 1793 | Elected in 1788. | 1 | 1st | 1 | Elected in 1788. | Mar 4, 1789 – Mar 3, 1793 | Anti- Admin. | Richard Bassett | 1 |
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Re-elected in 1790.Resigned to become Chief Justice of Delaware. | 2 | 2nd | Pro- Admin. |
3rd | 2 | Elected in 1793.Resigned. | Mar 4, 1793 – Jan 19, 1798 | Pro-Admin. | John Vining | 2 |
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Vacant | Sep 18, 1793 – Feb 7, 1795 | |
2 | Henry Latimer | Pro- Admin. | Feb 7, 1795 – Feb 28, 1801 | Elected in 1795 to finish Read's term. |
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Federalist | 4th | Federalist |
Re-elected in 1797.Resigned. | 3 | 5th |
Elected in 1798 to finish Vining's term.Died. | Jan 19, 1798 – Aug 11, 1798 | Federalist | Joshua Clayton | 3 |
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| Aug 11, 1798 – Jan 17, 1799 | Vacant |
Elected in 1799 to finish Clayton's term. | Jan 17, 1799 – Nov 6, 1804 | Federalist | William H. Wells | 4 |
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6th | 3 | Re-elected in 1799.Resigned. |
3 | Samuel White | Federalist | Feb 28, 1801 – Nov 4, 1809 | Appointed to finish Latimer's term. |
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7th |
Re-elected in 1803. [1] | 4 | 8th |
| Nov 6, 1804 – Nov 13, 1804 | Vacant |
Elected in 1804 to finish Wells's term. | Nov 13, 1804 – Mar 3, 1813 | Federalist | James A. Bayard | 5 |
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9th | 4 | Re-elected in 1805. |
10th |
Re-elected in 1809. [2] Died. | 5 | 11th |
Vacant | Nov 4, 1809 – Jan 12, 1810 | |
4 | Outerbridge Horsey | Federalist | Jan 12, 1810 – Mar 3, 1821 | Elected in 1810 to finish White's term. |
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12th | 5 | Re-elected in 1811.Resigned. |
13th | | Mar 3, 1813 – May 21, 1813 | Vacant |
Elected in 1813 to finish Bayard's term.Retired. | May 21, 1813 – Mar 3, 1817 | Federalist | William H. Wells | 6 |
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Re-elected in 1815. [3] Retired. | 6 | 14th |
15th | 6 | Elected in 1817.Legislature failed to elect. | Mar 4, 1817 – Mar 3, 1823 | Federalist | Nicholas Van Dyke | 7 |
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16th |
Vacant | Mar 4, 1821 – Jan 23, 1822 | | 7 | 17th |
5 | Caesar A. Rodney | Democratic- Republican | Jan 24, 1822 – Jan 29, 1823 | Elected late to finish vacant term.Resigned to become U.S. Minister to the United Provinces of the River Plate. |
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Vacant | Jan 29, 1823 – Jan 8, 1824 | |
18th | 7 | | Mar 4, 1823 – Jan 8, 1824 | Vacant |
Re-elected late.Died. | Jan 8, 1824 – May 21, 1826 | Federalist | Nicholas Van Dyke |
6 | Thomas Clayton | Federalist | Jan 8, 1824 – Mar 3, 1827 | Elected in 1824 to finish Rodney's term. |
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National Republican | 19th | National Republican |
| May 21, 1826 – Nov 8, 1826 | Vacant |
Appointed to continue Van Dyke's term.Retired. | Nov 8, 1826 – Jan 12, 1827 | National Republican | Daniel Rodney | 8 |
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Elected in 1827 to finish Van Dyke's term.Retired. | Jan 12, 1827 – Mar 3, 1829 | Jacksonian | Henry M. Ridgely | 9 |
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7 | Louis McLane | Jacksonian | Mar 4, 1827 – Apr 16, 1829 | Elected in 1827.Resigned to become U.S. Envoy Extraordinary and Minister Plenipotentiary to England. | 8 | 20th |
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21st | 8 | Elected in 1829. | Mar 4, 1829 – Dec 29, 1836 | National Republican | John M. Clayton | 10 |
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Vacant | Apr 16, 1829 – Jan 7, 1830 | |
8 | Arnold Naudain | National Republican | Jan 7, 1830 – Jun 16, 1836 | Elected in 1830 to finish McLane's term. |
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22nd |
Re-elected in 1832.Resigned. | 9 | 23rd |
24th | 9 | Re-elected in 1835.Resigned. |
9 | Richard H. Bayard | National Republican | Jun 17, 1836 – Sep 19, 1839 | Elected in 1836 to finish Naudain's term. |
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| Dec 29, 1836 – Jan 9, 1837 | Vacant |
Elected in 1837 to finish his cousin's term. | Jan 9, 1837 – Mar 3, 1847 | National Republican | Thomas Clayton | 11 |
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Whig | 25th | Whig |
Re-elected during the 1838/39 cycle.Resigned to become Chief Justice of Delaware. | 10 | 26th |
Vacant | Sep 19, 1839 – Jan 11, 1841 | |
Richard H. Bayard | Whig | Jan 12, 1841 – Mar 3, 1845 | Elected in 1841 to finish his own term.Retired. |
27th | 10 | Re-elected in 1841. |
28th |
10 | John M. Clayton | Whig | Mar 4, 1845 – Feb 23, 1849 | Elected in 1845.Resigned to become U.S. Secretary of State. | 11 | 29th |
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30th | 11 | Elected in 1846 or 1847.Retired. | Mar 4, 1847 – Mar 3, 1853 | Whig | Presley Spruance | 12 |
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11 | John Wales | Whig | Feb 23, 1849 – Mar 3, 1851 | Elected in 1849 to finish Clayton's term.Lost re-election. |
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31st |
12 | James A. Bayard Jr. | Democratic | Mar 4, 1851 – Jan 29, 1864 | Elected in 1851. | 12 | 32nd |
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33rd | 12 | Elected in 1853.Died. | Mar 4, 1853 – Nov 9, 1856 | Whig | John M. Clayton | 13 |
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34th |
| Nov 9, 1856 – Nov 19, 1856 | Vacant |
Appointed to continue Clayton's term.Declined nomination to finish Clayton's term. | Nov 19, 1856 – Jan 14, 1857 | Whig | Joseph P. Comegys | 14 |
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Elected in 1857 to finish Clayton's term.Lost re-election. | Jan 14, 1857 – Mar 3, 1859 | Democratic | Martin W. Bates | 15 |
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Re-elected in 1857. | 13 | 35th |
36th | 13 | Elected in 1858. | Mar 4, 1859 – Mar 3, 1871 | Democratic | Willard Saulsbury Sr. | 16 |
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37th |
Re-elected in 1863.Resigned. | 14 | 38th |
13 | George R. Riddle | Democratic | Jan 29, 1864 – Mar 28, 1867 | Elected in 1864 to finish Bayard's term.Died. |
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39th | 14 | Re-elected in 1864.Lost re-election. |
40th |
Vacant | Mar 29, 1867 – Apr 5, 1867 | |
14 | James A. Bayard Jr. | Democratic | Apr 5, 1867 – Mar 3, 1869 | Appointed to continue his own term. Elected in 1869 to finish his own term. [4] Retired. |
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15 | Thomas F. Bayard | Democratic | Mar 4, 1869 – Mar 6, 1885 | Elected in 1869. | 15 | 41st |
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42nd | 15 | Elected in 1870. | Mar 4, 1871 – Mar 3, 1889 | Democratic | Eli Saulsbury | 17 |
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43rd |
Re-elected in 1875. | 16 | 44th |
45th | 16 | Re-elected in 1876. |
46th |
Re-elected in 1881.Resigned to become U.S. Secretary of State. | 17 | 47th |
48th | 17 | Re-elected in 1883.Lost re-election. |
49th |
Vacant | Mar 6, 1885 – Mar 18, 1885 | |
16 | George Gray | Democratic | Mar 18, 1885 – Mar 3, 1899 | Elected in 1885 to finish Bayard's term. |
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Re-elected in 1887. | 18 | 50th |
51st | 18 | Election year unknown.Lost re-election. | Mar 4, 1889 – Mar 3, 1895 | Republican | Anthony Higgins | 18 |
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52nd |
Re-elected in 1893.Lost re-election. | 19 | 53rd |
54th | 19 | Legislature failed to elect. | Mar 4, 1895 – Jan 19, 1897 | Vacant |
Elected in 1897 to finish vacant term.Lost re-election. | Jan 19, 1897 – Mar 3, 1901 | Democratic | Richard R. Kenney | 19 |
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55th |
Vacant | Mar 4, 1899 – Mar 1, 1903 | Legislature failed to elect. | 20 | 56th |
57th | 20 | Legislature failed to elect. | Mar 4, 1901 – Mar 2, 1903 | Vacant |
17 | L. Heisler Ball | Republican | Mar 2, 1903 – Mar 3, 1905 | Elected in 1903 to finish vacant term. | Elected in 1903 to finish vacant term.Retired. | Mar 2, 1903 – Mar 3, 1907 | Republican | J. Frank Allee | 20 |
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58th |
Vacant | Mar 4, 1905 – Jun 12, 1906 | Legislature failed to elect. | 21 | 59th |
18 | Henry A. du Pont | Republican | Jun 13, 1906 – Mar 3, 1917 | Elected in 1906 to finish vacant term. |
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60th | 21 | Elected in 1907. [5] Retired. | Mar 4, 1907 – Mar 3, 1913 | Republican | Harry A. Richardson | 21 |
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61st |
Re-elected in 1911.Lost re-election. | 22 | 62nd |
63rd | 22 | Elected in 1913.Lost re-election. | Mar 4, 1913 – Mar 3, 1919 | Democratic | Willard Saulsbury Jr. | 22 |
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64th |
19 | Josiah O. Wolcott | Democratic | Mar 4, 1917 – Jul 2, 1921 | Elected in 1916. Resigned to become Chancellor of Delaware. | 23 | 65th |
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66th | 23 | Elected in 1918.Lost renomination. | Mar 4, 1919 – Mar 3, 1925 | Republican | L. Heisler Ball | 23 |
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67th |
20 | T. Coleman du Pont | Republican | Jul 7, 1921 – Nov 6, 1922 | Appointed to finish Wolcott's term.Lost election to finish Wolcott's term. |
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21 | Thomas F. Bayard Jr. | Democratic | Nov 7, 1922 – Mar 3, 1929 | Elected in 1922 to finish Wolcott's term. |
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Elected in 1922.Lost re-election. | 24 | 68th |
69th | 24 | Elected in 1924.Resigned. | Mar 4, 1925 – Dec 8, 1928 | Republican | T. Coleman du Pont | 24 |
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70th |
| Dec 8, 1928 – Dec 10, 1928 | Vacant |
Appointed to finish du Pont's term. Elected in 1930 to finish du Pont's term. | Dec 10, 1928 – Jan 3, 1937 | Republican | Daniel O. Hastings | 25 |
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22 | John G. Townsend Jr. | Republican | Mar 4, 1929 – Jan 3, 1941 | Elected in 1928. | 25 | 71st |
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72nd | 25 | Elected in 1930.Lost re-election. |
73rd |
Re-elected in 1934.Lost re-election. | 26 | 74th |
75th | 26 | Elected in 1936.Lost renomination. | Jan 3, 1937 – Jan 3, 1943 | Democratic | James H. Hughes | 26 |
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76th |
23 | James M. Tunnell | Democratic | Jan 3, 1941 – Jan 3, 1947 | Elected in 1940.Lost re-election. | 27 | 77th |
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78th | 27 | Elected in 1942.Lost re-election. | Jan 3, 1943 – Jan 3, 1949 | Republican | C. Douglass Buck | 27 |
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79th |
24 | John J. Williams | Republican | Jan 3, 1947 – Dec 31, 1970 | Elected in 1946. | 28 | 80th |
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81st | 28 | Elected in 1948. | Jan 3, 1949 – Jan 3, 1961 | Democratic | J. Allen Frear Jr. | 28 |
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82nd |
Re-elected in 1952. | 29 | 83rd |
84th | 29 | Re-elected in 1954.Lost re-election. |
85th |
Re-elected in 1958. | 30 | 86th |
87th | 30 | Elected in 1960. | Jan 3, 1961 – Jan 3, 1973 | Republican | J. Caleb Boggs | 29 |
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88th |
Re-elected in 1964.Retired and resigned to give his successor preferential seniority. | 31 | 89th |
90th | 31 | Re-elected in 1966.Lost re-election. |
91st |
25 | William Roth | Republican | Jan 1, 1971 – Jan 3, 2001 | Appointed to finish Williams's term, having been elected to the next term. |
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Elected in 1970. | 32 | 92nd |
93rd | 32 | Elected in 1972. | Jan 3, 1973 – Jan 15, 2009 | Democratic | Joe Biden | 30 |
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94th |
Re-elected in 1976. | 33 | 95th |
96th | 33 | Re-elected in 1978. |
97th |
Re-elected in 1982. | 34 | 98th |
99th | 34 | Re-elected in 1984. |
100th |
Re-elected in 1988. | 35 | 101st |
102nd | 35 | Re-elected in 1990. |
103rd |
Re-elected in 1994.Lost re-election. | 36 | 104th |
105th | 36 | Re-elected in 1996. |
106th |
26 | Tom Carper | Democratic | Jan 3, 2001 – Jan 3, 2025 | Elected in 2000. | 37 | 107th |
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108th | 37 | Re-elected in 2002. |
109th |
Re-elected in 2006. | 38 | 110th |
111th | 38 | Re-elected in 2008.Resigned to become U.S. Vice President. |
Appointed to continue Biden's term.Retired when his successor was elected. | Jan 15, 2009 [6] – Nov 15, 2010 | Democratic | Ted Kaufman | 31 |
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Elected in 2010 to finish Biden's term. | Nov 15, 2010 – present | Democratic | Chris Coons | 32 |
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112th |
Re-elected in 2012. | 39 | 113th |
114th | 39 | Re-elected in 2014. |
115th |
Re-elected in 2018.Retired. | 40 | 116th |
117th | 40 | Re-elected in 2020. |
118th |
27 | Lisa Blunt Rochester | Democratic | Jan 3, 2025 – present | Elected in 2024. | 41 | 119th |
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120th | 41 | To be determined in the 2026 election. |
121st |
# | Senator | Party | Years in office | Electoral history | T | C | T | Electoral history | Years in office | Party | Senator | # |
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Class 1 | Class 2 |
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