<P> The Senate twice refused to seat Frank L. Smith, in December 1926 for an appointed term and in March 1927 for an elected one, due to corruption, but he is included in this list because Smith and the Governor considered him to be a senator for approximately two years . </P> <P> Of the eight African Americans ever to sit in the U.S. Senate since Reconstruction, three have held Illinois's Class 3 seat, including Barack Obama who went on to become the President of the United States . This makes Illinois the state with the most African - American senators . </P> <Table> <Tr> <Td_colspan="6"> <P> Class 2 </P> <P> Class 2 U.S. Senators belong to the electoral cycle that were elected for three U.S. Congresses in the first elections of 1818, and then the seat was contested every three Congresses (six years) thereafter . The seat in recent years have been contested in 1996, 2002, 2008, and 2014 . The next election will be in 2020 . </P> </Td> <Th> o n g r s s </Th> <Td_colspan="6"> <P> Class 3 </P> <P> Class 3 U.S. Senators belong to the electoral cycle that were elected for one United States Congress in the first elections of 1818, and then the seat was contested every three Congresses (six years) thereafter . The seat in recent years have been contested in 1998, 2004, 2010, and 2016 . The next election will be in 2022 . </P> </Td> </Tr> <Tr> <Th> #</Th> <Th> Senator </Th> <Th> Party </Th> <Th> Years in office </Th> <Th> Electoral history </Th> <Th> r m </Th> <Th> r m </Th> <Th> Electoral history </Th> <Th> Years in office </Th> <Th> Party </Th> <Th> Senator </Th> <Th> #</Th> </Tr> <Tr> <Th> </Th> <Td> Jesse B. Thomas </Td> <Td> Democratic - Republican </Td> <Td> December 3, 1818--March 3, 1829 </Td> <Td> Elected in 1818 . </Td> <Td> </Td> <Td> 15th Congress </Td> <Td> </Td> <Td> Elected in 1818 . </Td> <Td> December 3, 1818--March 3, 1824 </Td> <Td> Democratic - Republican </Td> <Td> Ninian Edwards </Td> <Th> </Th> </Tr> <Tr> <Td> 16th Congress </Td> <Td> </Td> <Td> Re-elected in 1819 . Resigned . </Td> </Tr> <Tr> <Td> 17th Congress </Td> </Tr> <Tr> <Td> Crawford Democratic - Republican </Td> <Td> Re-elected in 1823 . Retired . </Td> <Td> </Td> <Td> 18th Congress </Td> <Td> Adams - Clay Democratic - Republican </Td> </Tr> <Tr> <Td> </Td> <Td> March 4, 1824--November 24, 1824 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td> Elected to finish Edwards's term . Retired . </Td> <Td> November 24, 1824--March 3, 1825 </Td> <Td> Crawford Democratic - Republican </Td> <Td> John McLean </Td> <Th> </Th> </Tr> <Tr> <Td> Anti - Jacksonian </Td> <Td> 19th Congress </Td> <Td> </Td> <Td> Elected in 1825 . </Td> <Td> March 4, 1825--December 12, 1835 </Td> <Td> Jacksonian </Td> <Td> Elias Kane </Td> <Th> </Th> </Tr> <Tr> <Td> Adams </Td> <Td> 20th Congress </Td> </Tr> <Tr> <Th> </Th> <Td> John McLean </Td> <Td> Jacksonian </Td> <Td> March 4, 1829--October 14, 1830 </Td> <Td> Elected in 1829 . Died . </Td> <Td> </Td> <Td> 21st Congress </Td> </Tr> <Tr> <Td_colspan="3"> Vacant </Td> <Td> October 14, 1830--November 12, 1830 </Td> <Td> </Td> </Tr> <Tr> <Th> </Th> <Td> David J. Baker </Td> <Td> Jacksonian </Td> <Td> November 12, 1830--December 11, 1830 </Td> <Td> Appointed to continue McLean's term . Retired . </Td> </Tr> <Tr> <Th> </Th> <Td> John M. Robinson </Td> <Td> Jacksonian </Td> <Td> December 11, 1830--March 3, 1841 </Td> <Td> Elected to finish McLean's term . </Td> </Tr> <Tr> <Td> 22nd Congress </Td> <Td> </Td> <Td> Re-elected in 1831 . Died . </Td> </Tr> <Tr> <Td> 23rd Congress </Td> </Tr> <Tr> <Td> Re-elected in 1835 . Retired . </Td> <Td> </Td> <Td> 24th Congress </Td> </Tr> <Tr> <Td> </Td> <Td> December 12, 1835--December 30, 1835 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td> Appointed to finish Kane's term . Lost election to full term . </Td> <Td> December 30, 1835--March 3, 1837 </Td> <Td> Jacksonian </Td> <Td> William Lee D. Ewing </Td> <Th> </Th> </Tr> <Tr> <Td> Democratic </Td> <Td> 25th Congress </Td> <Td> 5 </Td> <Td> Elected in 1837 . Retired . </Td> <Td> March 4, 1837--March 3, 1843 </Td> <Td> Democratic </Td> <Td> Richard M. Young </Td> <Th> 5 </Th> </Tr> <Tr> <Td> 26th Congress </Td> </Tr> <Tr> <Th> 5 </Th> <Td> Samuel McRoberts </Td> <Td> Democratic </Td> <Td> March 4, 1841--March 27, 1843 </Td> <Td> Elected in 1841 . Died . </Td> <Td> 5 </Td> <Td> 27th Congress </Td> </Tr> <Tr> <Td> 28th Congress </Td> <Td> 6 </Td> <Td> Elected in 1843 . Lost renomination . </Td> <Td> March 4, 1843--March 3, 1849 </Td> <Td> Democratic </Td> <Td> Sidney Breese </Td> <Th> 6 </Th> </Tr> <Tr> <Td_colspan="3"> Vacant </Td> <Td> March 27, 1843--August 16, 1843 </Td> <Td> </Td> </Tr> <Tr> <Th> 6 </Th> <Td> James Semple </Td> <Td> Democratic </Td> <Td> August 16, 1843--March 3, 1847 </Td> <Td> Appointed to continue McRoberts's term . Elected December 11, 1844 to finish McRoberts's term . Retired . </Td> </Tr> <Tr> <Td> 29th Congress </Td> </Tr> <Tr> <Th> 7 </Th> <Td> Stephen A. Douglas </Td> <Td> Democratic </Td> <Td> March 4, 1847--June 3, 1861 </Td> <Td> Elected in 1846 . </Td> <Td> 6 </Td> <Td> 30th Congress </Td> </Tr> <Tr> <Td> 31st Congress </Td> <Td> 7 </Td> <Td> Elected in 1848 or 1849 . Election voided . </Td> <Td> March 4, 1849--March 15, 1849 </Td> <Td> Democratic </Td> <Td> James Shields </Td> <Th> 7 </Th> </Tr> <Tr> <Td> </Td> <Td> March 15, 1849--October 27, 1849 </Td> <Td_colspan="2"> Vacant </Td> </Tr> <Tr> <Td> Elected to finish his own term . Lost re-election . </Td> <Td> October 27, 1849--March 3, 1855 </Td> <Td> Democratic </Td> <Td> James Shields </Td> </Tr> <Tr> <Td> 32nd Congress </Td> </Tr> <Tr> <Td> Re-elected in 1852 . </Td> <Td> 7 </Td> <Td> 33rd Congress </Td> </Tr> <Tr> <Td> 34th Congress </Td> <Td> 8 </Td> <Td> Elected in 1854 or 1855 . </Td> <Td> March 4, 1855--March 3, 1873 </Td> <Td> Democratic </Td> <Td> Lyman Trumbull </Td> <Th> 8 </Th> </Tr> <Tr> <Td> 35th Congress </Td> <Td> Republican </Td> </Tr> <Tr> <Td> Re-elected in 1858 . Died . </Td> <Td> 8 </Td> <Td> 36th Congress </Td> </Tr> <Tr> <Td> 37th Congress </Td> <Td> 9 </Td> <Td> Re-elected in 1861 . </Td> </Tr> <Tr> <Td_colspan="3"> Vacant </Td> <Td> June 3, 1861--June 26, 1861 </Td> <Td> </Td> </Tr> <Tr> <Th> 8 </Th> <Td> Orville Browning </Td> <Td> Republican </Td> <Td> June 26, 1861--January 12, 1863 </Td> <Td> Appointed to continue Douglas's term . Lost election to finish Douglas's term . </Td> </Tr> <Tr> <Th> 9 </Th> <Td> William A. Richardson </Td> <Td> Democratic </Td> <Td> January 12, 1863--March 3, 1865 </Td> <Td> Elected to finish Douglas's term . Retired . </Td> </Tr> <Tr> <Td> 38th Congress </Td> </Tr> <Tr> <Th> 10 </Th> <Td> Richard Yates </Td> <Td> Republican </Td> <Td> March 4, 1865--March 3, 1871 </Td> <Td> Elected in 1864 or 1865 . Retired . </Td> <Td> 9 </Td> <Td> 39th Congress </Td> </Tr> <Tr> <Td> 40th Congress </Td> <Td> 10 </Td> <Td> Re-elected in 1867 . (Data unknown / missing . You can help!) </Td> </Tr> <Tr> <Td> 41st Congress </Td> </Tr> <Tr> <Th> 11 </Th> <Td> John A. Logan </Td> <Td> Republican </Td> <Td> March 4, 1871--March 3, 1877 </Td> <Td> Elected in 1870 or 1871 . Lost re-election . </Td> <Td> 10 </Td> <Td> 42nd Congress </Td> <Td> Liberal Republican </Td> </Tr> <Tr> <Td> 43rd Congress </Td> <Td> 11 </Td> <Td> Elected in 1872 or 1873 . Retired . </Td> <Td> March 4, 1873--March 3, 1879 </Td> <Td> Republican </Td> <Td> Richard J. Oglesby </Td> <Th> 9 </Th> </Tr> <Tr> <Td> 44th Congress </Td> </Tr> <Tr> <Th> 12 </Th> <Td> David Davis </Td> <Td> Independent </Td> <Td> March 4, 1877--March 3, 1883 </Td> <Td> Election year unknown . Retired . </Td> <Td> 11 </Td> <Td> 45th Congress </Td> </Tr> <Tr> <Td> 46th Congress </Td> <Td> 12 </Td> <Td> Elected in 1879 . </Td> <Td> March 4, 1879--March 3, 1885 </Td> <Td> Republican </Td> <Td> John A. Logan </Td> <Th> 10 </Th> </Tr> <Tr> <Td> 47th Congress </Td> </Tr> <Tr> <Th> 13 </Th> <Td> Shelby Moore Cullom </Td> <Td> Republican </Td> <Td> March 4, 1883--March 3, 1913 </Td> <Td> Elected in 1882 . </Td> <Td> 12 </Td> <Td> 48th Congress </Td> </Tr> <Tr> <Td> 49th Congress </Td> <Td> 13 </Td> <Td> Legislature failed to elect . </Td> </Tr> <Tr> <Td> Re-elected late in 1885 . Died . </Td> <Td> May 19, 1885--December 26, 1886 </Td> <Td> Republican </Td> <Td> John A. Logan </Td> </Tr> <Tr> <Td> </Td> <Td> December 26, 1886--January 19, 1887 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td> Elected to finish Logan's term . Retired . </Td> <Td> January 19, 1887--March 3, 1891 </Td> <Td> Republican </Td> <Td> Charles B. Farwell </Td> <Th> 11 </Th> </Tr> <Tr> <Td> 50th Congress </Td> </Tr> <Tr> <Td> Re-elected in 1888 . </Td> <Td> 13 </Td> <Td> 51st Congress </Td> </Tr> <Tr> <Td> 52nd Congress </Td> <Td> 14 </Td> <Td> Elected in 1890 . Retired . </Td> <Td> March 4, 1891--March 3, 1897 </Td> <Td> Democratic </Td> <Td> John M. Palmer </Td> <Th> 12 </Th> </Tr> <Tr> <Td> 53rd Congress </Td> </Tr> <Tr> <Td> Re-elected in 1894 . </Td> <Td> 14 </Td> <Td> 54th Congress </Td> </Tr> <Tr> <Td> 55th Congress </Td> <Td> 15 </Td> <Td> Elected January 20, 1897 . Retired . </Td> <Td> March 4, 1897--March 3, 1903 </Td> <Td> Republican </Td> <Td> William E. Mason </Td> <Th> 13 </Th> </Tr> <Tr> <Td> 56th Congress </Td> </Tr> <Tr> <Td> Re-elected January 22, 1901 . </Td> <Td> 15 </Td> <Td> 57th Congress </Td> </Tr> <Tr> <Td> 58th Congress </Td> <Td> 16 </Td> <Td> Elected January 20, 1903 . Lost re-election . </Td> <Td> March 4, 1903--March 3, 1909 </Td> <Td> Republican </Td> <Td> Albert J. Hopkins </Td> <Th> 14 </Th> </Tr> <Tr> <Td> 59th Congress </Td> </Tr> <Tr> <Td> Re-elected January 22, 1907 . Lost renomination . </Td> <Td> 16 </Td> <Td> 60th Congress </Td> </Tr> <Tr> <Td> 61st Congress </Td> <Td> 17 </Td> <Td> </Td> <Td> March 4, 1909--June 18, 1909 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td> Elected May 26, 1909, but ineligible until resignation from U.S. House . Election voided . </Td> <Td> June 18, 1909--July 13, 1912 </Td> <Td> Republican </Td> <Td> William Lorimer </Td> <Th> 15 </Th> </Tr> <Tr> <Td> 62nd Congress </Td> </Tr> <Tr> <Td> </Td> <Td> July 13, 1912--March 26, 1913 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td_colspan="3"> Vacant </Td> <Td> March 4, 1913--March 26, 1913 </Td> <Td> Legislature failed to elect . </Td> <Td> 17 </Td> <Td> 63rd Congress </Td> </Tr> <Tr> <Th> 14 </Th> <Td> J. Hamilton Lewis </Td> <Td> Democratic </Td> <Td> March 26, 1913--March 3, 1919 </Td> <Td> Elected March 26, 1913 to finish the vacant term . Lost re-election . </Td> <Td> Elected March 26, 1913 to finish Lorimer's term . </Td> <Td> March 26, 1913--March 3, 1921 </Td> <Td> Republican </Td> <Td> Lawrence Y. Sherman </Td> <Th> 16 </Th> </Tr> <Tr> <Td> 64th Congress </Td> <Td> 18 </Td> <Td> Re-elected in 1914 . Retired . </Td> </Tr> <Tr> <Td> 65th Congress </Td> </Tr> <Tr> <Th> 15 </Th> <Td> Joseph M. McCormick </Td> <Td> Republican </Td> <Td> March 4, 1919--February 25, 1925 </Td> <Td> Elected in 1918 . Lost renomination and died just before the end of the term . </Td> <Td> 18 </Td> <Td> 66th Congress </Td> </Tr> <Tr> <Td> 67th Congress </Td> <Td> 19 </Td> <Td> Elected in 1920 . Lost renomination and died just before the end of the term . </Td> <Td> March 4, 1921--December 7, 1926 </Td> <Td> Republican </Td> <Td> William B. McKinley </Td> <Th> 17 </Th> </Tr> <Tr> <Td> 68th Congress </Td> </Tr> <Tr> <Th> 16 </Th> <Td> Charles S. Deneen </Td> <Td> Republican </Td> <Td> February 26, 1925--March 3, 1931 </Td> <Td> Appointed to finish McCormick's term, having already been elected to the next term . </Td> </Tr> <Tr> <Td> Elected in 1924 . Lost renomination . </Td> <Td> 19 </Td> <Td> 69th Congress </Td> </Tr> <Tr> <Td> Appointed to continue McKinley's term . Not seated / resigned . </Td> <Td> December 7, 1926 </Td> <Td> Republican </Td> <Td> Frank L. Smith </Td> <Th> 18 </Th> </Tr> <Tr> <Td> </Td> <Td> December 7, 1926--December 3, 1928 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td> 70th Congress </Td> <Td> 20 </Td> </Tr> <Tr> <Td> Elected to finish the term . Lost re-election . </Td> <Td> December 3, 1928--March 3, 1933 </Td> <Td> Republican </Td> <Td> Otis F. Glenn </Td> <Th> 19 </Th> </Tr> <Tr> <Td> 71st Congress </Td> </Tr> <Tr> <Th> 17 </Th> <Td> J. Hamilton Lewis </Td> <Td> Democratic </Td> <Td> March 4, 1931--April 9, 1939 </Td> <Td> Elected in 1930 . </Td> <Td> 20 </Td> <Td> 72nd Congress </Td> </Tr> <Tr> <Td> 73rd Congress </Td> <Td> 21 </Td> <Td> Elected in 1932 . Retired . </Td> <Td> March 4, 1933--January 3, 1939 </Td> <Td> Democratic </Td> <Td> William H. Dieterich </Td> <Th> 20 </Th> </Tr> <Tr> <Td> 74th Congress </Td> </Tr> <Tr> <Td> Re-elected in 1936 . Died . </Td> <Td> 21 </Td> <Td> 75th Congress </Td> </Tr> <Tr> <Td> 76th Congress </Td> <Td> 22 </Td> <Td> Elected in 1938 . </Td> <Td> January 3, 1939--January 3, 1951 </Td> <Td> Democratic </Td> <Td> Scott W. Lucas </Td> <Th> 21 </Th> </Tr> <Tr> <Td_colspan="3"> Vacant </Td> <Td> April 9, 1939--April 14, 1939 </Td> <Td> </Td> </Tr> <Tr> <Th> 18 </Th> <Td> James M. Slattery </Td> <Td> Democratic </Td> <Td> April 14, 1939--November 21, 1940 </Td> <Td> Appointed to continue Lewis's term . Lost election to finish Lewis's term . </Td> </Tr> <Tr> <Th> 19 </Th> <Td> Charles W. Brooks </Td> <Td> Republican </Td> <Td> November 22, 1940--January 3, 1949 </Td> <Td> Elected to finish Lewis's term . </Td> </Tr> <Tr> <Td> 77th Congress </Td> </Tr> <Tr> <Td> Re-elected in 1942 . Lost re-election . </Td> <Td> 22 </Td> <Td> 78th Congress </Td> </Tr> <Tr> <Td> 79th Congress </Td> <Td> 23 </Td> <Td> Re-elected in 1944 . Lost re-election . </Td> </Tr> <Tr> <Td> 80th Congress </Td> </Tr> <Tr> <Th> 20 </Th> <Td> Paul Douglas </Td> <Td> Democratic </Td> <Td> January 3, 1949--January 3, 1967 </Td> <Td> Elected in 1948 . </Td> <Td> 23 </Td> <Td> 81st Congress </Td> </Tr> <Tr> <Td> 82nd Congress </Td> <Td> 24 </Td> <Td> Elected in 1950 . </Td> <Td> January 3, 1951--September 7, 1969 </Td> <Td> Republican </Td> <Td> Everett Dirksen </Td> <Th> 22 </Th> </Tr> <Tr> <Td> 83rd Congress </Td> </Tr> <Tr> <Td> Re-elected in 1954 . </Td> <Td> 24 </Td> <Td> 84th Congress </Td> </Tr> <Tr> <Td> 85th Congress </Td> <Td> 25 </Td> <Td> Re-elected in 1956 . </Td> </Tr> <Tr> <Td> 86th Congress </Td> </Tr> <Tr> <Td> Re-elected in 1960 . Lost re-election . </Td> <Td> 25 </Td> <Td> 87th Congress </Td> </Tr> <Tr> <Td> 88th Congress </Td> <Td> 26 </Td> <Td> Re-elected in 1962 . </Td> </Tr> <Tr> <Td> 89th Congress </Td> </Tr> <Tr> <Th> 21 </Th> <Td> Charles H. Percy </Td> <Td> Republican </Td> <Td> January 3, 1967--January 3, 1985 </Td> <Td> Elected in 1966 . </Td> <Td> 26 </Td> <Td> 90th Congress </Td> </Tr> <Tr> <Td> 91st Congress </Td> <Td> 27 </Td> <Td> Re-elected in 1968 . Died . </Td> </Tr> <Tr> <Td> </Td> <Td> September 7, 1969--September 17, 1969 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td> Appointed to continue Dirksen's term . Lost election to finish Dirksen's term . </Td> <Td> September 17, 1969--November 3, 1970 </Td> <Td> Republican </Td> <Td> Ralph Tyler Smith </Td> <Th> 23 </Th> </Tr> <Tr> <Td> </Td> <Td> November 3, 1970--November 17, 1970 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td> Elected to finish Dirksen's term . </Td> <Td> November 17, 1970--January 3, 1981 </Td> <Td> Democratic </Td> <Td> Adlai Stevenson III </Td> <Th> 24 </Th> </Tr> <Tr> <Td> 92nd Congress </Td> </Tr> <Tr> <Td> Re-elected in 1972 . </Td> <Td> 27 </Td> <Td> 93rd Congress </Td> </Tr> <Tr> <Td> 94th Congress </Td> <Td> 28 </Td> <Td> Re-elected in 1974 . Retired . </Td> </Tr> <Tr> <Td> 95th Congress </Td> </Tr> <Tr> <Td> Re-elected in 1978 . Lost re-election . </Td> <Td> 28 </Td> <Td> 96th Congress </Td> </Tr> <Tr> <Td> 97th Congress </Td> <Td> 29 </Td> <Td> Elected in 1980 . </Td> <Td> January 3, 1981--January 3, 1993 </Td> <Td> Democratic </Td> <Td> Alan J. Dixon </Td> <Th> 25 </Th> </Tr> <Tr> <Td> 98th Congress </Td> </Tr> <Tr> <Th> 22 </Th> <Td> Paul Simon </Td> <Td> Democratic </Td> <Td> January 3, 1985--January 3, 1997 </Td> <Td> Elected in 1984 . </Td> <Td> 29 </Td> <Td> 99th Congress </Td> </Tr> <Tr> <Td> 100th Congress </Td> <Td> 30 </Td> <Td> Re-elected in 1986 . Lost renomination . </Td> </Tr> <Tr> <Td> 101st Congress </Td> </Tr> <Tr> <Td> Re-elected in 1990 . Retired . </Td> <Td> 30 </Td> <Td> 102nd Congress </Td> </Tr> <Tr> <Td> 103rd Congress </Td> <Td> 31 </Td> <Td> Elected in 1992 . Lost re-election . </Td> <Td> January 3, 1993--January 3, 1999 </Td> <Td> Democratic </Td> <Td> Carol Moseley Braun </Td> <Th> 26 </Th> </Tr> <Tr> <Td> 104th Congress </Td> </Tr> <Tr> <Th> 23 </Th> <Td> Dick Durbin </Td> <Td> Democratic </Td> <Td> January 3, 1997--Present </Td> <Td> Elected in 1996 . </Td> <Td> 31 </Td> <Td> 105th Congress </Td> </Tr> <Tr> <Td> 106th Congress </Td> <Td> 32 </Td> <Td> Elected in 1998 . Retired . </Td> <Td> January 3, 1999--January 3, 2005 </Td> <Td> Republican </Td> <Td> Peter Fitzgerald </Td> <Th> 27 </Th> </Tr> <Tr> <Td> 107th Congress </Td> </Tr> <Tr> <Td> Re-elected in 2002 . </Td> <Td> 32 </Td> <Td> 108th Congress </Td> </Tr> <Tr> <Td> 109th Congress </Td> <Td> 33 </Td> <Td> Elected in 2004 . Resigned to become U.S. President . </Td> <Td> January 3, 2005--November 16, 2008 </Td> <Td> Democratic </Td> <Td> Barack Obama </Td> <Th> 28 </Th> </Tr> <Tr> <Td> 110th Congress </Td> </Tr> <Tr> <Td> </Td> <Td> November 16, 2008--January 12, 2009 </Td> <Td_colspan="3"> Vacant </Td> </Tr> <Tr> <Td> Re-elected in 2008 . </Td> <Td> 33 </Td> <Td> 111th Congress </Td> </Tr> <Tr> <Td> Appointed to continue Obama's term . Retired when successor qualified . </Td> <Td> January 12, 2009--November 29, 2010 </Td> <Td> Democratic </Td> <Td> Roland Burris </Td> <Th> 29 </Th> </Tr> <Tr> <Td> Elected to finish Obama's term . </Td> <Td> November 29, 2010--January 3, 2017 </Td> <Td> Republican </Td> <Td> Mark Kirk </Td> <Th> 30 </Th> </Tr> <Tr> <Td> 112th Congress </Td> <Td> 34 </Td> <Td> Elected to full term in 2010 . Lost re-election . </Td> </Tr> <Tr> <Td> 113th Congress </Td> </Tr> <Tr> <Td> Re-elected in 2014 . </Td> <Td> 34 </Td> <Td> 114th Congress </Td> </Tr> <Tr> <Td> 115th Congress </Td> <Td> 35 </Td> <Td> Elected in 2016 . </Td> <Td> January 3, 2017--Present </Td> <Td> Democratic </Td> <Td> Tammy Duckworth </Td> <Th> 31 </Th> </Tr> <Tr> <Td> 116th Congress </Td> </Tr> <Tr> <Td_colspan="5"> To be determined in the 2020 election . </Td> <Td> 35 </Td> <Td> 117th Congress </Td> </Tr> <Tr> <Td> 118th Congress </Td> <Td> 36 </Td> <Td_colspan="5"> To be determined in the 2022 election . </Td> </Tr> <Tr> <Th> #</Th> <Th> Senator </Th> <Th> Party </Th> <Th> Years in office </Th> <Th> Electoral history </Th> <Th> r m </Th> <Th> </Th> <Th> r m </Th> <Th> Electoral history </Th> <Th> Years in office </Th> <Th> Party </Th> <Th> Senator </Th> <Th> #</Th> </Tr> <Tr> <Th_colspan="6"> Class 2 </Th> <Th_colspan="6"> Class 3 </Th> </Tr> </Table> <Tr> <Td_colspan="6"> <P> Class 2 </P> <P> Class 2 U.S. Senators belong to the electoral cycle that were elected for three U.S. Congresses in the first elections of 1818, and then the seat was contested every three Congresses (six years) thereafter . The seat in recent years have been contested in 1996, 2002, 2008, and 2014 . The next election will be in 2020 . </P> </Td> <Th> o n g r s s </Th> <Td_colspan="6"> <P> Class 3 </P> <P> Class 3 U.S. Senators belong to the electoral cycle that were elected for one United States Congress in the first elections of 1818, and then the seat was contested every three Congresses (six years) thereafter . The seat in recent years have been contested in 1998, 2004, 2010, and 2016 . The next election will be in 2022 . </P> </Td> </Tr>

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