Missouri was admitted to the Union on August 10, 1821. Its current U.S. senators are Republicans Josh Hawley (class 1, serving since 2019) and Eric Schmitt (class 3, serving since 2023). Francis Cockrell was Missouri's longest-serving senator (1875âÂÂ1905). Missouri is one of fifteen states alongside California, Colorado, Georgia, Hawaii, Idaho, Louisiana, Maine, Massachusetts, Minnesota, Nevada, Pennsylvania, South Dakota and Utah to have a younger senior senator and an older junior senator.
|- style="height:2em" ! rowspan=19 | 1 | rowspan=19 align=left | <br/>Thomas Hart Benton<br /> | rowspan=2 | Democratic-<br/>Republican | rowspan=19 nowrap | Aug 10, 1821 âÂÂ<br/>Mar 3, 1851 | rowspan=3 | Elected in 1821. | rowspan=3 | 1 | | rowspan=2 | 1 | rowspan=2 | Elected in 1821. | rowspan=5 nowrap | Aug 10, 1821 âÂÂ<br/>Mar 3, 1831 | rowspan=2 | Democratic-<br/>Republican | rowspan=5 align=right | <br/>David Barton<br /> ! rowspan=5 | 1
|- style="height:2em" |
|- style="height:2em" | rowspan=8 | Jacksonian | | rowspan=3 | 2 | rowspan=3 | Re-elected in 1825.Lost re-election. | rowspan=3 | National<br/>Republican
|- style="height:2em" | rowspan=3 | Re-elected in 1827. | rowspan=3 | 2 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=5 | 3 | rowspan=2 | Elected in 1830.Died. | rowspan=2 nowrap | Mar 4, 1831 âÂÂ<br/>Jun 6, 1833 | rowspan=2 | Jacksonian | rowspan=2 align=right | Alexander Buckner<br /> ! rowspan=2 | 2
|- style="height:2em" | rowspan=5 | Re-elected in 1833. | rowspan=5 | 3 | rowspan=3
|- style="height:2em" | | nowrap | Jun 6, 1833 âÂÂ<br/>Oct 25, 1833 | colspan=3 | Vacant
|- style="height:2em" | rowspan=2 | Appointed to continue Buckner's term.Elected to finish Buckner's term. | rowspan=6 nowrap | Oct 25, 1833 âÂÂ<br/>Oct 3, 1843 | rowspan=2 | Jacksonian | rowspan=6 align=right | <br/>Lewis F. Linn<br /> ! rowspan=6 | 3
|- style="height:2em" |
|- style="height:2em" | rowspan=9 | Democratic | | rowspan=3 | 4 | rowspan=3 | Re-elected in 1836. | rowspan=4 | Democratic
|- style="height:2em" | rowspan=5 | Re-elected in 1839. | rowspan=5 | 4 |
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | rowspan=5 | 5 | Re-elected in 1842.Died.
|- style="height:2em" | | nowrap | Oct 3, 1843 âÂÂ<br/>Oct 14, 1843 | colspan=3 | Vacant
|- style="height:2em" | rowspan=3 | Appointed to continue Linn's term.Elected to finish Linn's term. | rowspan=6 nowrap | Oct 14, 1843 âÂÂ<br/>Mar 3, 1855 | rowspan=6 | Democratic | rowspan=6 align=right | <br/>David Rice Atchison<br /> ! rowspan=6 | 4
|- style="height:2em" | rowspan=3 | Re-elected in 1845.Lost re-election. | rowspan=3 | 5 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 6 | rowspan=3 | Re-elected in 1849.Lost re-election.
|- style="height:2em" ! rowspan=4 | 2 | rowspan=4 align=left | <br/>Henry S. Geyer<br /> | rowspan=4 | Whig | rowspan=4 nowrap | Mar 4, 1851 âÂÂ<br/>Mar 3, 1857 | rowspan=4 | Elected in 1851.Retired. | rowspan=4 | 6 |
|- style="height:2em" |
|- style="height:2em" | rowspan=2 | rowspan=4 | 7 | Failure to elect. | nowrap | Mar 4, 1855 âÂÂ<br/>Jan 12, 1857 | colspan=3 | Vacant
|- style="height:2em" | rowspan=3 | Elected late in 1857.Retired or lost re-election. | rowspan=3 nowrap | Jan 12, 1857 âÂÂ<br/>Mar 3, 1861 | rowspan=3 | Democratic | rowspan=3 align=right | <br/>James S. Green<br /> ! rowspan=3 | 5
|- style="height:2em" ! rowspan=4 | 3 | rowspan=4 align=left | <br/>Trusten Polk<br /> | rowspan=4 | Democratic | rowspan=4 nowrap | Mar 4, 1857 âÂÂ<br/>Jan 10, 1862 | rowspan=4 | Elected in 1857.Expelled for supporting the Confederacy in the American Civil War. | rowspan=7 | 7 |
|- style="height:2em" |
|- style="height:2em" | rowspan=5 | rowspan=8 | 8 | | nowrap | Mar 4, 1861 âÂÂ<br/>Mar 17, 1861 | colspan=3 | Vacant
|- style="height:2em" | Elected late in 1861.Expelled for supporting the Confederacy in the American Civil War. | nowrap | Mar 17, 1861 âÂÂ<br/>Jan 10, 1862 | | Democratic | align=right | <br/>Waldo Johnson<br /> ! 6
|- style="height:2em" | colspan=3 | Vacant | nowrap | Jan 10, 1862 âÂÂ<br/>Jan 17, 1862 | | | nowrap | Jan 10, 1862 âÂÂ<br/>Jan 17, 1862 | colspan=3 | Vacant
|- style="height:2em" ! rowspan=6 | 4 | rowspan=6 align=left | <br/>John B. Henderson<br /> | rowspan=1 | Union | rowspan=6 nowrap | Jan 17, 1862 âÂÂ<br/>Mar 3, 1869 | Appointed to continue Polk's term. | rowspan=3 | Appointed to continue Johnson's term.Successor qualified. | rowspan=3 nowrap | Jan 17, 1862 âÂÂ<br/>Nov 13, 1863 | rowspan=3 | Union | rowspan=3 align=right | <br/>Robert Wilson<br /> ! rowspan=3 | 7
|- style="height:2em" | rowspan=1 | Emancipation | Elected to finish Polk's term.
|- style="height:2em" | rowspan=2 | Radical Union | rowspan=4 | Re-elected in 1863.Retired. | rowspan=4 | 8 | rowspan=2
|- style="height:2em" | rowspan=2 | Elected to finish Johnson's term.Retired due to ill health. | rowspan=2 nowrap | Nov 13, 1863 âÂÂ<br/>Mar 3, 1867 | | Radical Union | rowspan=2 align=right | <br/>B. Gratz Brown<br /> ! rowspan=2 | 8
|- style="height:2em" | rowspan=2 | Republican | | | Republican
|- style="height:2em" | | rowspan=5 | 9 | rowspan=2 | Elected in 1866 or 1867.Resigned to become Chief Justice of the U.S. Court of Claims. | rowspan=2 nowrap | Mar 4, 1867 âÂÂ<br/>Dec 19, 1870 | rowspan=2 | Republican | rowspan=2 align=right | <br/>Charles D. Drake<br /> ! rowspan=2 | 9
|- style="height:2em" ! rowspan=5 | 5 | rowspan=5 align=left | <br/>Carl Schurz<br /> | | Republican | rowspan=5 nowrap | Mar 4, 1869 âÂÂ<br/>Mar 3, 1875 | rowspan=5 | Elected in 1868.Retired. | rowspan=5 | 9 | rowspan=2
|- style="height:2em" | rowspan=2 | Liberal Republican | Appointed to continue Drake's term.Retired when successor elected. | nowrap | Dec 19, 1870 âÂÂ<br/>Jan 20, 1871 | | Republican | align=right | <br/>Daniel T. Jewett<br /> ! 10
|- style="height:2em" | rowspan=2 | rowspan=2 | Elected to finish Drake's term.Lost re-election. | rowspan=2 nowrap | Jan 20, 1871 âÂÂ<br/>Mar 3, 1873 | rowspan=2 | Democratic | rowspan=2 align=right | <br/>Francis P. Blair<br /> ! rowspan=2 | 11
|- style="height:2em" | rowspan=2 | Republican
|- style="height:2em" | | rowspan=6 | 10 | rowspan=3 | Elected in 1872 or 1873.Died. | rowspan=3 nowrap | Mar 4, 1873 âÂÂ<br/>Sep 20, 1877 | rowspan=3 | Democratic | rowspan=3 align=right | <br/>Lewis V. Bogy<br /> ! rowspan=3 | 12
|- style="height:2em" ! rowspan=18 | 6 | rowspan=18 align=left | <br/>Francis Cockrell<br /> | rowspan=18 | Democratic | rowspan=18 nowrap | Mar 4, 1875 âÂÂ<br/>Mar 3, 1905 | rowspan=6 | Elected in 1874. | rowspan=6 | 10 |
|- style="height:2em" | rowspan=4
|- style="height:2em" | | nowrap | Sep 20, 1877 âÂÂ<br/>Sep 29, 1877 | colspan=3 | Vacant
|- style="height:2em" | Appointed to continue Bogy's term.Retired. | nowrap | Sep 29, 1877 âÂÂ<br/>Jan 26, 1879 | | Democratic | align=right | <br/>David H. Armstrong<br /> ! 13
|- style="height:2em" | Elected to finish Bogy's term.Retired. | nowrap | Jan 27, 1879 âÂÂ<br/>Mar 3, 1879 | | Democratic | align=right | <br/>James Shields<br /> ! 14
|- style="height:2em" | | rowspan=3 | 11 | rowspan=3 | Elected in 1879. | rowspan=12 nowrap | Mar 4, 1879 âÂÂ<br/>Mar 3, 1903 | rowspan=12 | Democratic | rowspan=12 align=right | <br/>George G. Vest<br /> ! rowspan=12 | 15
|- style="height:2em" | rowspan=3 | Re-elected in 1881. | rowspan=3 | 11 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 12 | rowspan=3 | Re-elected in 1885.
|- style="height:2em" | rowspan=3 | Re-elected in 1887. | rowspan=3 | 12 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 13 | rowspan=3 | Re-elected in 1891.
|- style="height:2em" | rowspan=3 | Re-elected in 1893. | rowspan=3 | 13 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 14 | rowspan=3 | Re-elected in 1897.Retired.
|- style="height:2em" | rowspan=3 | Re-elected in 1899.<br/>Lost re-election. | rowspan=3 | 14 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=4 | 15 | rowspan=4 | Elected in 1903. | rowspan=9 nowrap | Mar 4, 1903 âÂÂ<br/>Apr 14, 1918 | rowspan=9 | Democratic | rowspan=9 align=right | <br/>William J. Stone<br /> ! rowspan=9 | 16
|- style="height:2em" | colspan=3 | Vacant | nowrap | Mar 4, 1905 âÂÂ<br/>Mar 18, 1905 | | rowspan=4 | 15 | rowspan=2
|- style="height:2em" ! rowspan=3 | 7 | rowspan=3 align=left | <br/>William Warner<br /> | rowspan=3 | Republican | rowspan=3 nowrap | Mar 18, 1905 âÂÂ<br/>Mar 3, 1911 | rowspan=3 | Elected late in 1905.Retired.
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 16 | rowspan=3 | Re-elected in 1909.
|- style="height:2em" ! rowspan=15 | 8 | rowspan=15 align=left | <br/>James A. Reed<br /> | rowspan=15 | Democratic | rowspan=15 nowrap | Mar 4, 1911 âÂÂ<br/>Mar 3, 1929 | rowspan=3 | Elected in 1910. | rowspan=3 | 16 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=6 | 17 | rowspan=2 | Re-elected in 1914.Died.
|- style="height:2em" | rowspan=6 | Re-elected in 1916. | rowspan=6 | 17 | rowspan=4
|- style="height:2em" | | nowrap | Apr 14, 1918 âÂÂ<br/>Apr 30, 1918 | colspan=3 | Vacant
|- style="height:2em" | Appointed to continue Stone's term.Lost renomination to finish Stone's term. | nowrap | Apr 30, 1918 âÂÂ<br/>Nov 5, 1918 | | Democratic | align=right | <br/>Xenophon P. Wilfley<br /> ! 17
|- style="height:2em" | rowspan=2 | Elected in 1918 to finish Stone's term. | rowspan=5 nowrap | Nov 6, 1918 âÂÂ<br/>May 16, 1925 | rowspan=5 | Republican | rowspan=5 align=right | <br/>Selden P. Spencer<br /> ! rowspan=5 | 18
|- style="height:2em" |
|- style="height:2em" | | rowspan=6 | 18 | rowspan=3 | Re-elected in 1920.Died.
|- style="height:2em" | rowspan=6 | Re-elected in 1922.Retired. | rowspan=6 | 18 |
|- style="height:2em" | rowspan=4
|- style="height:2em" | | nowrap | May 16, 1925 âÂÂ<br/>May 25, 1925 | colspan=3 | Vacant
|- style="height:2em" | Appointed to continue Spencer's term.Lost elections to finish Spencer's term and to the next term. | nowrap | May 25, 1925 âÂÂ<br/>Dec 5, 1926 | | Republican | align=right | <br/>George H. Williams<br /> ! 19
|- style="height:2em" | Elected to finish Spencer's term. | rowspan=4 nowrap | Dec 6, 1926 âÂÂ<br/>Feb 3, 1933 | rowspan=4 | Democratic | rowspan=4 align=right | <br/>Harry B. Hawes<br /> ! rowspan=4 | 20
|- style="height:2em" | | rowspan=4 | 19 | rowspan=3 | Also elected to the next term in 1926.Retired, then resigned early.
|- style="height:2em" ! rowspan=4 | 9 | rowspan=4 align=left | <br/>Roscoe C. Patterson<br /> | rowspan=4 | Republican | rowspan=4 nowrap | Mar 4, 1929 âÂÂ<br/>Jan 3, 1935 | rowspan=4 | Elected in 1928.Lost re-election. | rowspan=4 | 19 |
|- style="height:2em" | rowspan=2
|- style="height:2em" | Appointed to finish Hawes's term, having already been elected to the next term. | rowspan=7 nowrap | Feb 3, 1933 âÂÂ<br/>Jan 3, 1945 | rowspan=7 | Democratic | rowspan=7 align=right | <br/>Joel B. Clark<br /> ! rowspan=7 | 21
|- style="height:2em" | | rowspan=3 | 20 | rowspan=3 | Elected in 1932.
|- style="height:2em" ! rowspan=6 | 10 | rowspan=6 align=left | <br/>Harry S. Truman<br /> | rowspan=6 | Democratic | rowspan=6 nowrap | Jan 3, 1935 âÂÂ<br/>Jan 17, 1945 | rowspan=3 | Elected in 1934. | rowspan=3 | 20 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 21 | rowspan=3 | Re-elected in 1938.Lost renomination.
|- style="height:2em" | rowspan=3 | Re-elected in 1940.Resigned to become U.S. Vice President. | rowspan=4 | 21 |
|- style="height:2em" |
|- style="height:2em" | rowspan=2 | rowspan=4 | 22 | rowspan=4 | Elected in 1944.Lost re-election. | rowspan=4 nowrap | Jan 3, 1945 âÂÂ<br/>Jan 3, 1951 | rowspan=4 | Republican | rowspan=4 align=right | <br/>Forrest C. Donnell<br /> ! rowspan=4 | 22
|- style="height:2em" ! 11 | align=left | <br/>Frank P. Briggs<br /> | | Democratic | nowrap | Jan 18, 1945 âÂÂ<br/>Jan 3, 1947 | Appointed to finish Truman's term.Lost election to full term.
|- style="height:2em" ! rowspan=3 | 12 | rowspan=3 align=left | <br/>James P. Kem<br /> | rowspan=3 | Republican | rowspan=3 nowrap | Jan 3, 1947 âÂÂ<br/>Jan 3, 1953 | rowspan=3 | Elected in 1946.Lost re-election. | rowspan=3 | 22 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 23 | rowspan=3 | Elected in 1950. | rowspan=5 nowrap | Jan 3, 1951 âÂÂ<br/>Sep 13, 1960 | rowspan=5 | Democratic | rowspan=5 align=right | <br/>Thomas Hennings<br /> ! rowspan=5 | 23
|- style="height:2em" ! rowspan=15 | 13 | rowspan=15 align=left | <br/>Stuart Symington<br /> | rowspan=15 | Democratic | rowspan=15 nowrap | Jan 3, 1953 âÂÂ<br/>Dec 27, 1976 | rowspan=3 | Elected in 1952. | rowspan=3 | 23 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=5 | 24 | rowspan=2 | Re-elected in 1956.Died.
|- style="height:2em" | rowspan=5 | Elected in 1958. | rowspan=5 | 24 | rowspan=3
|- style="height:2em" | | nowrap | Sep 13, 1960 âÂÂ<br/>Sep 23, 1960 | colspan=3 | Vacant
|- style="height:2em" | rowspan=2 | Appointed to continue Henning's term.Elected to finish Henning's term. | rowspan=5 nowrap | Sep 23, 1960 âÂÂ<br/>Dec 27, 1968 | rowspan=5 | Democratic | rowspan=5 align=right | <br/>Edward V. Long<br /> ! rowspan=5 | 24
|- style="height:2em" |
|- style="height:2em" | | rowspan=4 | 25 | rowspan=3 | Re-elected in 1962.Lost renomination, and resigned early.
|- style="height:2em" | rowspan=4 | Elected in 1964. | rowspan=4 | 25 |
|- style="height:2em" | rowspan=2
|- style="height:2em" | Appointed to finish Long's term, having been elected to next term. | rowspan=11 nowrap | Dec 28, 1968 âÂÂ<br/>Jan 3, 1987 | rowspan=11 | Democratic | rowspan=11 align=right | <br/>Thomas Eagleton<br /> ! rowspan=11 | 25
|- style="height:2em" | | rowspan=3 | 26 | rowspan=3 | Elected in 1968.
|- style="height:2em" | rowspan=3 | Elected in 1970.Retired, then resigned early to give successor preferential seniority. | rowspan=4 | 26 |
|- style="height:2em" |
|- style="height:2em" | rowspan=2 | rowspan=4 | 27 | rowspan=4 | Re-elected in 1974.
|- style="height:2em" ! rowspan=10 | 14 | rowspan=10 align=left | <br/>John Danforth<br /> | rowspan=10 | Republican | rowspan=10 nowrap | Dec 27, 1976 âÂÂ<br/>Jan 3, 1995 | Appointed to finish Symington's term, having already been elected to the next term.
|- style="height:2em" | rowspan=3 | Elected in 1976. | rowspan=3 | 27 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 28 | rowspan=3 | Re-elected in 1980.Retired.
|- style="height:2em" | rowspan=3 | Re-elected in 1982. | rowspan=3 | 28 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 29 | rowspan=3 | Elected in 1986. | rowspan=13 nowrap | Jan 3, 1987 âÂÂ<br/>Jan 3, 2011 | rowspan=13 | Republican | rowspan=13 align=right | <br/>Kit Bond<br /> ! rowspan=13 | 26
|- style="height:2em" | rowspan=3 | Re-elected in 1988.Retired. | rowspan=3 | 29 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 30 | rowspan=3 | Re-elected in 1992.
|- style="height:2em" ! rowspan=3 | 15 | rowspan=3 align=left | <br/>John Ashcroft<br /> | rowspan=3 | Republican | rowspan=3 nowrap | Jan 3, 1995 âÂÂ<br/>Jan 3, 2001 | rowspan=3 | Elected in 1994.Lost re-election. | rowspan=3 | 30 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=4 | 31 | rowspan=4 | Re-elected in 1998.
|- style="height:2em" ! 16 | align=left | <br/>Jean Carnahan<br /> | | Democratic | nowrap | Jan 3, 2001 âÂÂ<br/>Nov 23, 2002 | Appointed to begin the term of her husband, Mel Carnahan (D), who was posthumously elected in 2000.Lost election to finish her husband's term. | rowspan=4 | 31 | rowspan=2
|- style="height:2em" ! rowspan=3 | 17 | rowspan=3 align=left | <br/>Jim Talent<br /> | rowspan=3 | Republican | rowspan=3 nowrap | Nov 23, 2002 âÂÂ<br/>Jan 3, 2007 | rowspan=3 | Elected in 2002 to finish Mel Carnahan's term.Lost re-election.
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 32 | rowspan=3 | Re-elected in 2004.Retired.
|- style="height:2em" ! rowspan=6 | 18 | rowspan=6 align=left | <br/>Claire McCaskill<br /> | rowspan=6 | Democratic | rowspan=6 nowrap | Jan 3, 2007 âÂÂ<br/>Jan 3, 2019 | rowspan=3 | Elected in 2006. | rowspan=3 | 32 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 33 | rowspan=3 | Elected in 2010. | rowspan=6 nowrap | Jan 3, 2011 âÂÂ<br/>Jan 3, 2023 | rowspan=6 | Republican | rowspan=6 align=right | <br/>Roy Blunt<br /> ! rowspan=6 | 27
|- style="height:2em" | rowspan=3 | Re-elected in 2012.Lost re-election. | rowspan=3 | 33 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 34 | rowspan=3 | Re-elected in 2016.Retired.
|- style="height:2em" ! rowspan=6 | 19 | rowspan=6 align=left | <br/>Josh Hawley<br /> | rowspan=6 | Republican | rowspan=6 nowrap | Jan 3, 2019 âÂÂ<br/>present | rowspan=3 | Elected in 2018. | rowspan=3 | 34 |
|- style="height:2em" |
|- style="height:2em" | | rowspan=3 | 35 | rowspan=3 | Elected in 2022. | rowspan=3 nowrap | Jan 3, 2023 âÂÂ<br/>present | rowspan=3 | Republican | rowspan=3 align=right | <br/>Eric Schmitt<br /> ! rowspan=3 | 28
|- style="height:2em" | rowspan=3| Re-elected in 2024. | rowspan=3| 35 |
|- style="height:2em" |
|- style="height:2em" | | 36 | colspan=5 | To be determined in the 2028 election.