| Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in2006,2012,2018, and2024 . The next election will be in2030. | C | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in2004,2010,2016, and2022. The next election will be in2028. |
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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 |  Oliver Ellsworth | Pro-Administration | Mar 4, 1789 – Mar 8, 1796 | Elected in 1788. | 1 | 1st | 1 | Elected in 1788.Resigned. | Mar 4, 1789 – Mar 3, 1791 | Pro-Administration |  William S. Johnson | 1 |
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| Re-elected in 1791.Resigned to becomeChief Justice of the United States. | 2 | 2nd | | Mar 4, 1791 – Jun 13, 1791 | Vacant |
| Elected to finish Johnson's term.Died. | Jun 13, 1791 – Jul 23, 1793 | Pro-Administration |  Roger Sherman | 2 |
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| 3rd |
| | Jul 23, 1793 – Dec 2, 1793 | Vacant |
| Elected to finish Sherman's term.Retired. | Dec 2, 1793 – Mar 3, 1795 | Pro-Administration |  Stephen Mix Mitchell | 3 |
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| Federalist | 4th | 2 | Election date unknown.Resigned to becomeLieutenant Governor of Connecticut. | Mar 4, 1795 – Jun 10, 1796 | Federalist |  Jonathan Trumbull Jr. | 4 |
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| Vacant | Mar 8, 1796 – May 12, 1796 | |
| | Jun 10, 1796 – Oct 13, 1796 | Vacant |
| Elected to finish Trumbull's term. | Oct 13, 1796 – Jul 19, 1807 | Federalist |  Uriah Tracy | 5 |
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| 2 |  James Hillhouse | Federalist | May 12, 1796 – Jun 10, 1810 | Elected to finish Ellsworth's term. |
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| Re-elected in 1797. | 3 | 5th |
| 6th |
| 7th | 3 | Re-elected in 1801. |
| Re-elected in 1802.[1] | 4 | 8th |
| 9th |
| 10th | 4 | Re-elected in 1807.Died. |
| | Jul 19, 1807 – Oct 25, 1807 | Vacant |
| Elected to finish Tracy's term. | Oct 25, 1807 – May 13, 1813 | Federalist |  Chauncey Goodrich | 6 |
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| Re-elected in 1809.Resigned. | 5 | 11th |
| Vacant | Jun 10, 1810 – Dec 4, 1810 | |
| 3 |  Samuel W. Dana | Federalist | Dec 4, 1810 – Mar 3, 1821 | Elected to finish Hillhouse's term. |
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| 12th |
| 13th | 5 | Re-elected in 1813.Resigned to becomeLieutenant Governor of Connecticut. |
| Elected to finish Goodrich's term.Retired. | May 13, 1813 – Mar 3, 1819 | Federalist |  David Daggett | 7 |
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| Re-elected in 1814. | 6 | 14th |
| 15th |
| 16th | 6 | Elected in 1818.Re-elected in 1824 and presented his credentials but was not permitted to qualify. | Mar 4, 1819 – Mar 3, 1825 | Democratic-Republican |  James Lanman | 8 |
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| 4 |  Elijah Boardman | Democratic-Republican | Mar 4, 1821 – Aug 18, 1823 | Elected in 1821.Died. | 7 | 17th |
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| 18th |
| Vacant | Aug 18, 1823 – Oct 8, 1823 | |
| 5 |  Henry W. Edwards | Democratic-Republican | Oct 8, 1823 – Mar 3, 1827 | Appointed to continue Boardman's term.Elected in 1824 to finish Boardman's term. |
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| Jacksonian | 19th | 7 | | Mar 4, 1825 – May 4, 1825 | Vacant |
| Elected late to complete Lanman's term.[data missing] | May 4, 1825 – Mar 3, 1831 | National Republican |  Calvin Willey | 9 |
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| 6 |  Samuel A. Foot | National Republican | Mar 4, 1827 – Mar 3, 1833 | Elected in 1826.Lost re-election. | 8 | 20th |
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| 21st |
| 22nd | 8 | Elected in 1831.[data missing] | Mar 4, 1831 – Mar 3, 1837 | National Republican |  Gideon Tomlinson | 10 |
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| 7 |  Nathan Smith | National Republican | Mar 4, 1833 – Dec 6, 1835 | Elected in 1832.Died. | 9 | 23rd |
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| 24th |
| Vacant | Dec 6, 1835 – Dec 21, 1835 | |
| 8 |  John Milton Niles | Jacksonian | Dec 21, 1835 – Mar 3, 1839 | Elected to finish Smith's term.Retired. |
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| Democratic | 25th | 9 | Elected in 1837.[data missing] | Mar 4, 1837 – Mar 3, 1843 | Democratic | Perry Smith | 11 |
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| 9 | Thaddeus Betts | Whig | Mar 4, 1839 – Apr 7, 1840 | Elected in 1838 or 1839.Died. | 10 | 26th |
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| Vacant | Apr 7, 1840 – May 4, 1840 | |
| 10 |  Jabez W. Huntington | Whig | May 4, 1840 – Nov 1, 1847 | Elected to finish Betts's term. |
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| 27th |
| 28th | 10 | Elected in 1842.Retired. | Mar 4, 1843[2] – Mar 3, 1849 | Democratic |  John Milton Niles | 12 |
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| Re-elected in 1844 or 1845.Died. | 11 | 29th |
| 30th |
| Vacant | Nov 1, 1847 – Nov 11, 1847 | |
| 11 |  Roger Sherman Baldwin | Whig | Nov 11, 1847 – Mar 3, 1851 | Appointed to continue Huntington's term.Elected in 1848 to finish Huntington's term.[data missing] |
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| 31st | 11 | Elected in 1848 or 1849.Resigned. | Mar 4, 1849 – May 24, 1854 | Whig |  Truman Smith | 13 |
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| Vacant | Mar 4, 1851 – May 12, 1852 | | 12 | 32nd |
| 12 |  Isaac Toucey | Democratic | May 12, 1852 – Mar 3, 1857 | Elected late in 1852.Retired. |
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| 33rd |
| Elected to finish Smith's term.Retired. | May 24, 1854 – Mar 3, 1855 | Free Soil |  Francis Gillette | 14 |
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| 34th | 12 | Elected in 1854. | Mar 4, 1855 – Mar 3, 1867 | Republican |  Lafayette S. Foster | 15 |
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| 13 |  James Dixon | Republican | Mar 4, 1857 – Mar 3, 1869 | Elected in 1856. | 13 | 35th |
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| 36th |
| 37th | 13 | Re-elected in 1860.Lost re-election. |
| Re-elected in 1862.Lost re-election. | 14 | 38th |
| 39th |
| 40th | 14 | Elected in 1866. | Mar 4, 1867 – Nov 21, 1875 | Republican |  Orris S. Ferry | 16 |
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| 14 |  William A. Buckingham | Republican | Mar 4, 1869 – Feb 5, 1875 | Elected in 1868 or 1869.Lost re-election and died before end of term. | 15 | 41st |
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| 42nd |
| 43rd | 15 | Re-elected in 1872.Died. | Liberal Republican |
| 15 |  William W. Eaton | Democratic | Feb 5, 1875 – Mar 3, 1881 | Appointed to finish Buckingham's term, having been elected to the next term. |
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| Elected in 1874.Unknown if retired or lost re-election. | 16 | 44th | Republican |
| | Nov 21, 1875 – Nov 27, 1875 | Vacant |
| Appointed to continue Ferry's term.Retired when successor elected. | Nov 27, 1875 – May 17, 1876 | Democratic |  James E. English | 17 |
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| Elected to finish Ferry's term.[data missing] | May 17, 1876 – Mar 3, 1879 | Democratic |  William Barnum | 18 |
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| 45th |
| 46th | 16 | Elected in 1879. | Mar 4, 1879 – Apr 21, 1905 | Republican |  Orville H. Platt | 19 |
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| 16 |  Joseph R. Hawley | Republican | Mar 4, 1881 – Mar 3, 1905 | Elected in 1881. | 17 | 47th |
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| 48th |
| 49th | 17 | Re-elected in 1885. |
| Re-elected in 1887. | 18 | 50th |
| 51st |
| 52nd | 18 | Re-elected in 1891. |
| Re-elected in 1893. | 19 | 53rd |
| 54th |
| 55th | 19 | Re-elected in 1897. |
| Re-elected in 1899.Retired. | 20 | 56th |
| 57th |
| 58th | 20 | Re-elected in 1903.Died. |
| | Apr 21, 1905 – May 10, 1905 | Vacant |
| 17 |  Morgan Bulkeley | Republican | Mar 4, 1905 – Mar 3, 1911 | Elected in 1905.[3]Lost re-election. | 21 | 59th |
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| Elected to finish Platt's term. | May 10, 1905 – Oct 14, 1924 | Republican |  Frank B. Brandegee | 20 |
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| 60th |
| 61st | 21 | Re-elected in 1909. |
| 18 |  George P. McLean | Republican | Mar 4, 1911 – Mar 3, 1929 | Elected in 1911. | 22 | 62nd |
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| 63rd |
| 64th | 22 | Re-elected in 1914. |
| Re-elected in 1916. | 23 | 65th |
| 66th |
| 67th | 23 | Re-elected in 1920.Died. |
| Re-elected in 1922.Retired. | 24 | 68th |
| | Oct 14, 1924 – Dec 17, 1924 | Vacant |
| Elected to finish Brandegee's term and seated Jan 8, 1925.[4] | Dec 17, 1924 – Mar 3, 1933 | Republican |  Hiram Bingham III | 21 |
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| 69th |
| 70th | 24 | Re-elected in 1926.Lost re-election. |
| 19 |  Frederic C. Walcott | Republican | Mar 4, 1929 – Jan 3, 1935 | Elected in 1928.Lost re-election. | 25 | 71st |
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| 72nd |
| 73rd | 25 | Elected in 1932.Lost re-election. | Mar 4, 1933 – Jan 3, 1939 | Democratic |  Augustine Lonergan | 22 |
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| 20 |  Francis T. Maloney | Democratic | Jan 3, 1935 – Jan 16, 1945 | Elected in 1934. | 26 | 74th |
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| 75th |
| 76th | 26 | Elected in 1938.Lost re-election. | Jan 3, 1939 – Jan 3, 1945 | Republican |  John A. Danaher | 23 |
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| Re-elected in 1940.Died. | 27 | 77th |
| 78th |
| 79th | 27 | Elected in 1944. | Jan 3, 1945 – Jul 28, 1952 | Democratic |  Brien McMahon | 24 |
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| Vacant | Jan 16, 1945 – Feb 15, 1945 | |
| 21 |  Thomas C. Hart | Republican | Feb 15, 1945 – Nov 5, 1946 | Appointed to continue Maloney's term.Successor qualified. |
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| Vacant | Nov 5, 1946 – Dec 27, 1946 | |
| 22 |  Raymond E. Baldwin | Republican | Dec 27, 1946 – Dec 16, 1949 | Elected to finish Maloney's term. |
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| Elected to full term in 1946.Resigned. | 28 | 80th |
| 81st |
| 23 |  William Benton | Democratic | Dec 17, 1949 – Jan 3, 1953 | Appointed to continue Baldwin's term.Elected to finish Baldwin's term.Lost re-election. |
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| 82nd | 28 | Re-elected in 1950.Died. |
| | Jul 28, 1952 – Aug 29, 1952 | Vacant |
| Appointed to continue McMahon's term.Retired when successor elected, and elected to the class 1 seat. | Aug 29, 1952 – Nov 4, 1952 | Republican |  William A. Purtell | 25 |
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| Elected to finish McMahon's term. | Nov 4, 1952 – Jan 3, 1963 | Republican |  Prescott Bush | 26 |
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| 24 |  William A. Purtell | Republican | Jan 3, 1953 – Jan 3, 1959 | Elected in 1952.Lost re-election. | 29 | 83rd |
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| 84th |
| 85th | 29 | Re-elected in 1956.Retired. |
| 25 |  Thomas J. Dodd | Democratic | Jan 3, 1959 – Jan 3, 1971 | Elected in 1958. | 30 | 86th |
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| 87th |
| 88th | 30 | Elected in 1962. | Jan 3, 1963 – Jan 3, 1981 | Democratic |  Abraham Ribicoff | 27 |
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| Re-elected in 1964.Lost renomination, and lost re-election as anindependent. | 31 | 89th |
| 90th |
| 91st | 31 | Re-elected in 1968. |
| 26 |  Lowell Weicker | Republican | Jan 3, 1971 – Jan 3, 1989 | Elected in 1970. | 32 | 92nd |
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| 93rd |
| 94th | 32 | Re-elected in 1974.Retired. |
| Re-elected in 1976. | 33 | 95th |
| 96th |
| 97th | 33 | Elected in 1980. | Jan 3, 1981 – Jan 3, 2011 | Democratic |  Chris Dodd | 28 |
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| Re-elected in 1982.Lost re-election. | 34 | 98th |
| 99th |
| 100th | 34 | Re-elected in 1986. |
| 27 |  Joe Lieberman | Democratic | Jan 3, 1989 – Jan 3, 2013 | Elected in 1988. | 35 | 101st |
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| 102nd |
| 103rd | 35 | Re-elected in 1992. |
| Re-elected in 1994. | 36 | 104th |
| 105th |
| 106th | 36 | Re-elected in 1998. |
| Re-elected in 2000. | 37 | 107th |
| 108th |
| 109th | 37 | Re-elected in 2004.Retired. |
| Independent | Lost re-nomination, but re-elected in 2006 as an Independent.Retired. | 38 | 110th |
| 111th |
| 112th | 38 | Elected in 2010. | Jan 3, 2011 – present | Democratic |  Richard Blumenthal | 29 |
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| 28 |  Chris Murphy | Democratic | Jan 3, 2013 – present | Elected in 2012. | 39 | 113th |
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| 114th |
| 115th | 39 | Re-elected in 2016. |
| Re-elected in 2018. | 40 | 116th |
| 117th |
| 118th | 40 | Re-elected in 2022. |
| Re-elected in 2024. | 41 | 119th |
| 120th |
| 121st | 41 | To be determined in the 2028 election. |
| # | Senator | Party | Years in office | Electoral history | T | C | T | Electoral history | Years in office | Party | Senator | # |
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| Class 1 | Class 3 |
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