| CONGRESS | NAME OF SENATOR | TERM BEGAN | TERM ENDED | COMMENTS |
|---|---|---|---|---|
| Class 1 | ||||
| 1st - 4th | Oliver Ellsworth (PRO-ADMIN, F) | Mar. 4, 1789 | Mar. 8, 1796 | Resigned |
| 4th - 11th | James Hillhouse (F) | May 12, 1796 | Jun. 10, 1810 | Resigned |
| 11th - 16th | Samuel W. Dana (F) | Dec. 4, 1810 | Mar. 3, 1821 | |
| 17th - 18th | Elijah Boardman (R) | Mar. 4, 1821 | Oct. 8, 1823 | Died |
| 18th - 19th | Henry W. Edwards (JR) | Oct. 8, 1823 | Mar. 3, 1827 | Appointed, then elected |
| 20th - 22nd | Samuel A. Foot (ADAMS, AJ) | Mar. 4, 1827 | Mar. 3, 1833 | |
| 23rd - 24th | Nathan Smith (AJ) | Mar. 4, 1833 | Dec. 6, 1835 | Died |
| 24th - 25th | John M. Niles (J) | Dec. 14, 1835 | Mar. 3, 1839 | Appointed, then elected |
| 26th | Thaddeus Betts (W) | Mar. 4, 1839 | Apr. 7, 1840 | Died |
| 26th - 30th | Jabez W. Huntington (W) | May 4, 1840 | Nov. 2, 1847 | Died |
| 30th - 31st | Roger S. Baldwin (W) | Nov. 11, 1847 | Mar. 3, 1851 | Appointed, then elected |
| 32nd - 34th | Issac Toucey1 (D) | May 12, 1852 | Mar. 3, 1857 | |
| 35th - 40th | James Dixon (R) | Mar. 4, 1857 | Mar. 3, 1869 | |
| 41st - 43rd | William A. Buckingham (R) | Mar. 4, 1869 | Feb. 5, 1875 | Died |
| 43rd - 46th | William W. Eaton (D) | Feb. 5, 1875 | Mar. 3, 1881 | Appointed, then elected |
| 47th - 58th | Joseph R. Hawley (R) | Mar. 4, 1881 | Mar. 3, 1905 | |
| 59th - 61st | Morgan G. Bulkely (R) | Mar. 4, 1905 | Mar. 3, 1911 | |
| 62nd - 70th | George P. McLean (R) | Mar. 4, 1911 | Mar. 3, 1929 | |
| 71st - 73rd | Frederic C. Walcott (R) | Mar. 4, 1929 | Jan. 3, 1935 | |
| 74th - 79th | Francis T. Maloney (D) | Jan. 3, 1935 | Jan. 16, 1945 | Died |
| 79th | Thomas C. Hart (R) | Feb. 15, 1945 | Nov. 5, 1946 | Appointed |
| 80th - 81st | Raymond E. Baldwin2 (R) | Dec. 27, 1946 | Dec. 16, 1949 | Resigned |
| 81st - 82nd | William Benton (D) | Dec. 17, 1949 | Jan. 3, 1953 | Appointed, then elected |
| 83rd - 85th | William A. Purtell (R) | Jan. 3, 1953 | Jan. 3, 1959 | |
| 86th - 91st | Thomas J. Dodd (D) | Jan. 3, 1959 | Jan. 3, 1971 | |
| 92nd - 100th | Lowell P. Weicker Jr. (R) | Jan. 3, 1971 | Jan. 3, 1989 | |
| 101st - 112th | Joseph I. Lieberman (D, ID) | Jan. 3, 1989 | Jan. 3, 2013 | |
| 113th - | Christopher Murphy (D) | Jan. 3, 2013 | Present | |
| Class 3 | ||||
| 1st - 2nd | William S. Johnson (PRO-ADMIN) | Mar. 4, 1789 | Mar. 4, 1791 | Resigned |
| 2nd - 3rd | Roger Sherman (PRO-ADMIN) | Jun. 13, 1791 | Jul. 23, 1793 | Died |
| 3rd | Stephen M. Mitchell (PRO-ADMIN) | Dec. 2, 1793 | Mar. 3, 1795 | |
| 4th | Jonathan Trumbull Jr. (F) | Mar. 4, 1795 | Jun. 10, 1796 | Resigned |
| 4th - 10th | Uriah Tracy (F) | Oct. 13, 1796 | Jul. 19, 1807 | Died |
| 10th - 13th | Chauncey Goodrich (F) | Oct. 25, 1807 | May 1813 | Resigned |
| 13th - 15th | David Daggett (F) | May 13, 1813 | Mar. 3, 1819 | |
| 16th - 18th | James Lanman (R, CRR) | Mar. 4, 1819 | Mar. 3, 1825 | |
| 19th - 21st | Calvin Willey3 (ADAMS, AJ) | May 4, 1825 | Mar. 3, 1831 | |
| 22nd - 24th | Gideon Tomlinson (AJ) | Mar. 4, 1831 | Mar. 3, 1837 | |
| 25th - 27th | Perry Smith (D) | Mar. 4, 1837 | Mar. 3, 1843 | |
| 28th - 30th | John M. Niles (D) | Mar. 4, 1843 | Mar. 3, 1849 | |
| 31st - 33rd | Truman Smith (W) | Mar. 4, 1849 | May 24, 1854 | Resigned |
| 33rd | Francis Gillette (FS) | May 25, 1854 | Mar. 3, 1855 | |
| 34th - 39th | Lafayette S. Foster (OP, R) | Mar. 4, 1855 | Mar. 3, 1867 | |
| 40th - 44th | Orris S. Ferry (R, LR, R) | Mar. 4, 1867 | Nov. 21, 1875 | Died |
| 44th | James E. English (D) | Nov. 27, 1875 | May 17, 1876 | Appointed |
| 44th - 45th | William H. Barnum (D) | May 17, 1876 | Mar. 3, 1879 | |
| 46th - 59th | Orville H. Platt (R) | Mar. 4, 1879 | Apr. 21, 1905 | Died |
| 59th - 68th | Frank B. Brandegee (R) | May 10, 1905 | Oct. 14, 1924 | Died |
| 68th - 72nd | Hiram Bingham (R) | Dec. 17, 19244 | Mar. 3, 1933 | |
| 73rd - 75th | Augustine Lonergan (D) | Mar. 4, 1933 | Jan. 3, 1939 | |
| 76th - 78th | John A. Danaher (R) | Jan. 3, 1939 | Jan. 3, 1945 | |
| 79th - 84th | Brien McMahon (D) | Jan. 3, 1945 | Jul. 28, 1952 | Died |
| 82nd | William A. Purtell (R) | Aug. 29, 1952 | Nov. 4, 1952 | Appointed |
| 82nd - 87th | Prescott S. Bush (R) | Nov. 5, 1952 | Jan. 3, 1963 | |
| 88th - 96th | Abraham A. Ribicoff (D) | Jan. 3, 1963 | Jan. 3, 1981 | |
| 97th - 111th | Christopher J. Dodd (D) | Jan. 3, 1981 | Jan. 3, 2011 | |
| 112th - | Richard Blumenthal (D) | Jan. 3, 2011 | Present | |
1. Vacancy from Mar. 4, 1851, to May 11, 1852, because of failure of governor to appoint.
2. Elected Nov. 6, 1946; remained as governor until his resignation on Dec. 26, 1946.
3. James Lanman had been appointed to the seat, but the Senate, on Mar. 5, 1825, would not permit him to qualify; vacancy from Mar. 4 to May 4, 1825, because of recess of legislature.
4. Vacancy from Oct. 15 to Dec. 16, 1924, when a successor was elected.
