M
| Senator | Years | State | Party |
|---|---|---|---|
| Willis Benson Machen | 1872–1873 | Kentucky | Democratic |
| Connie Mack III | 1989–2001 | Florida | Republican |
| Samuel Maclay | 1803–1809 | Pennsylvania | Democratic-Republican |
| William Maclay | 1789–1791 | Pennsylvania | Democratic-Republican |
| Nathaniel Macon | 1815–1824 | North Carolina | Democratic-Republican |
| 1824–1828 | Democratic | ||
| Warren G. Magnuson | 1944–1981 | Washington | Democratic |
| Allan B. Magruder | 1812–1813 | Louisiana | Democratic-Republican |
| William Mahone | 1881–1887 | Virginia | Readjuster |
| Francis Malbone | 1809 | Rhode Island | Federalist |
| Stephen Mallory | 1851–1861 | Florida | Democratic |
| Stephen Mallory II | 1897–1907 | Florida | Democratic |
| George W. Malone | 1947–1959 | Nevada | Republican |
| Francis T. Maloney | 1935–1945 | Connecticut | Democratic |
| Charles F. Manderson | 1883–1895 | Nebraska | Republican |
| Willie Person Mangum | 1831–1833 | North Carolina | Democratic |
| 1833–1836 | National Republican | ||
| 1840–1853 | Whig | ||
| Mike Mansfield | 1953–1977 | Montana | Democratic |
| Lee Mantle | 1895–1896 | Montana | Republican |
| 1896–1899 | Silver Republican | ||
| William L. Marcy | 1831–1833 | New York | Democratic |
| William Marks | 1825–1831 | Pennsylvania | National Republican |
| Humphrey Marshall | 1795–1801 | Kentucky | Federalist |
| Gilman Marston | 1889 | New Hampshire | Republican |
| Alexander Martin | 1793–1799 | North Carolina | Democratic-Republican |
| Edward Martin | 1947–1959 | Pennsylvania | Republican |
| George B. Martin | 1918–1919 | Kentucky | Democratic |
| John Martin | 1893–1895 | Kansas | Democratic |
| Thomas E. Martin | 1955–1961 | Iowa | Republican |
| Thomas S. Martin | 1895–1919 | Virginia | Democratic |
| James Edgar Martine | 1911–1917 | New Jersey | Democratic |
| Armistead T. Mason | 1816–1817 | Virginia | Democratic-Republican |
| James M. Mason | 1847–1861 | Virginia | Democratic |
| Jeremiah Mason | 1813–1817 | New Hampshire | Federalist |
| Jonathan Mason | 1800–1803 | Massachusetts | Federalist |
| Stevens T. Mason | 1794–1803 | Virginia | Democratic-Republican |
| William E. Mason | 1897–1903 | Illinois | Republican |
| William A. Massey | 1912–1913 | Nevada | Republican |
| Harlan Mathews | 1993–1994 | Tennessee | Democratic |
| Elisha Mathewson | 1807–1811 | Rhode Island | Democratic-Republican |
| Charles Mathias, Jr. | 1969–1987 | Maryland | Republican |
| Spark Matsunaga | 1977–1990 | Hawaii | Democratic |
| Stanley Matthews | 1877–1879 | Ohio | Republican |
| Mack Mattingly | 1981–1987 | Georgia | Republican |
| Samuel B. Maxey | 1875–1887 | Texas | Democratic |
| Burnet R. Maybank | 1941–1954 | South Carolina | Democratic |
| Earle B. Mayfield | 1923–1929 | Texas | Democratic |
| William G. McAdoo | 1933–1938 | California | Democratic |
| George W. McBride | 1895–1901 | Oregon | Republican |
| Pat McCarran | 1933–1954 | Nevada | Democratic |
| Eugene McCarthy | 1959–1971 | Minnesota | Democratic |
| Joseph McCarthy | 1947–1957 | Wisconsin | Republican |
| John L. McClellan | 1943–1977 | Arkansas | Democratic |
| James A. McClure | 1973–1991 | Idaho | Republican |
| Louis E. McComas | 1899–1905 | Maryland | Republican |
| William J. McConnell | 1890–1891 | Idaho | Republican |
| Joseph M. McCormick | 1919–1925 | Illinois | Republican |
| James B. McCreary | 1903–1909 | Kentucky | Democratic |
| Thomas C. McCreery | 1868–1871, 1873–1879 |
Kentucky | Democratic |
| Roscoe C. McCulloch | 1929–1930 | Ohio | Republican |
| Porter J. McCumber | 1899–1923 | North Dakota | Republican |
| James W. McDill | 1881–1883 | Iowa | Republican |
| Alexander McDonald | 1868–1871 | Arkansas | Republican |
| Joseph E. McDonald | 1875–1881 | Indiana | Democratic |
| James A. McDougall | 1861–1867 | California | Democratic |
| George McDuffie | 1842–1846 | South Carolina | Democratic |
| Samuel D. McEnery | 1897–1910 | Louisiana | Democratic |
| Ernest W. McFarland | 1941–1953 | Arizona | Democratic |
| Gale W. McGee | 1959–1977 | Wyoming | Democratic |
| George McGill | 1930–1939 | Kansas | Democratic |
| George McGovern | 1963–1981 | South Dakota | Democratic |
| J. Howard McGrath | 1947–1949 | Rhode Island | Democratic |
| Joseph McIlvaine | 1823–1824 | New Jersey | Democratic-Republican |
| 1824–1826 | National Republican | ||
| Thomas J. McIntyre | 1962–1979 | New Hampshire | Democratic |
| Samuel McKean | 1833–1839 | Pennsylvania | Democratic |
| Kenneth D. McKellar | 1917–1953 | Tennessee | Democratic |
| John McKinley | 1826–1831, 1837 |
Alabama | Democratic |
| William B. McKinley | 1921–1926 | Illinois | Republican |
| Louis McLane | 1827–1829 | Delaware | Democratic |
| Anselm J. McLaurin | 1894–1895, 1901–1909 |
Mississippi | Democratic |
| John L. McLaurin | 1897–1903 | South Carolina | Democratic |
| George P. McLean | 1911–1929 | Connecticut | Republican |
| John McLean | 1824–1825, 1829–1830 |
Illinois | Democratic |
| Brien McMahon | 1945–1952 | Connecticut | Democratic |
| William H. McMaster | 1925–1931 | South Dakota | Republican |
| James McMillan | 1889–1902 | Michigan | Republican |
| Samuel J. R. McMillan | 1875–1887 | Minnesota | Republican |
| Patrick V. McNamara | 1955–1966 | Michigan | Democratic |
| Charles L. McNary | 1917–1918, 1918–1944 |
Oregon | Republican |
| John R. McPherson | 1877–1895 | New Jersey | Democratic |
| John J. McRae | 1851–1852 | Mississippi | Democratic |
| Samuel McRoberts | 1841–1843 | Illinois | Democratic |
| James M. Mead | 1938–1947 | New York | Democratic |
| Rice W. Means | 1924–1927 | Colorado | Republican |
| Edwin L. Mechem | 1962–1964 | New Mexico | Republican |
| Return J. Meigs, Jr. | 1808–1810 | Ohio | Democratic-Republican |
| John Melcher | 1977–1989 | Montana | Democratic |
| Prentiss Mellen | 1818–1820 | Massachusetts | Federalist |
| David Meriwether | 1852 | Kentucky | Democratic |
| William D. Merrick | 1838–1845 | Maryland | Whig |
| Augustus S. Merrimon | 1873–1879 | North Carolina | Democratic |
| Jesse H. Metcalf | 1924–1937 | Rhode Island | Republican |
| Lee Metcalf | 1961–1978 | Montana | Democratic |
| Thomas Metcalfe | 1848–1849 | Kentucky | Whig |
| Howard Metzenbaum | 1974, 1976–1995 |
Ohio | Democratic |
| Joseph Millard | 1901–1907 | Nebraska | Republican |
| John Milledge | 1806–1809 | Georgia | Democratic-Republican |
| Bert H. Miller | 1949 | Idaho | Democratic |
| Homer V. M. Miller | 1869–1871 | Georgia | Democratic |
| Jack Miller | 1961–1973 | Iowa | Republican |
| Jacob W. Miller | 1841–1853 | New Jersey | Whig |
| John E. Miller | 1937–1941 | Arkansas | Democratic |
| John F. Miller | 1881–1886 | California | Republican |
| Stephen D. Miller | 1831–1833 | South Carolina | Nullifier |
| Warner Miller | 1881–1887 | New York | Republican |
| Zell Miller | 2000–2005 | Georgia | Democratic |
| Eugene D. Millikin | 1941–1957 | Colorado | Republican |
| Elijah H. Mills | 1820–1824 | Massachusetts | Federalist |
| 1824–1827 | National Republican | ||
| Roger Q. Mills | 1892–1899 | Texas | Democratic |
| John G. Milton | 1938 | New Jersey | Democratic |
| William H. Milton | 1908–1909 | Florida | Democratic |
| Sherman Minton | 1935–1941 | Indiana | Democratic |
| Charles B. Mitchel | 1861 | Arkansas | Democratic |
| George J. Mitchell | 1980–1995 | Maine | Democratic |
| Hugh Mitchell | 1945–1946 | Washington | Democratic |
| John H. Mitchell | 1873–1879, 1885–1897, 1901–1905 |
Oregon | Republican |
| John I. Mitchell | 1881–1887 | Pennsylvania | Republican |
| John L. Mitchell | 1893–1899 | Wisconsin | Democratic |
| Stephen Mix Mitchell | 1793–1795 | Connecticut | Federalist |
| Samuel L. Mitchill | 1804–1809 | New York | Democratic-Republican |
| Walter Mondale | 1964–1976 | Minnesota | Democratic |
| Hernando Money | 1897–1911 | Mississippi | Democratic |
| James Monroe | 1790–1794 | Virginia | Democratic-Republican |
| Mike Monroney | 1951–1969 | Oklahoma | Democratic |
| Joseph Montoya | 1964–1977 | New Mexico | Democratic |
| Blair Moody | 1951–1952 | Michigan | Democratic |
| Gideon C. Moody | 1889–1891 | South Dakota | Republican |
| Wyman B. S. Moor | 1848 | Maine | Democratic |
| Andrew Moore | 1804–1809 | Virginia | Democratic-Republican |
| A. Harry Moore | 1935–1938 | New Jersey | Democratic |
| Edward H. Moore | 1943–1949 | Oklahoma | Republican |
| Gabriel Moore | 1831–1833 | Alabama | Democratic |
| 1833–1837 | National Republican | ||
| James T. Morehead | 1841–1847 | Kentucky | Whig |
| Edwin D. Morgan | 1863–1869 | New York | Republican |
| John Tyler Morgan | 1877–1907 | Alabama | Democratic |
| Robert B. Morgan | 1975–1981 | North Carolina | Democratic |
| David L. Morril | 1817–1823 | New Hampshire | Democratic-Republican |
| Justin S. Morrill | 1867–1898 | Vermont | Republican |
| Lot M. Morrill | 1861–1869, 1869–1876 |
Maine | Republican |
| Gouverneur Morris | 1800–1803 | New York | Federalist |
| Robert Morris | 1789–1795 | Pennsylvania | Federalist |
| Thomas Morris | 1833–1839 | Ohio | Democratic |
| Cameron A. Morrison | 1930–1932 | North Carolina | Democratic |
| Dwight Morrow | 1930–1931 | New Jersey | Republican |
| Jeremiah Morrow | 1813–1819 | Ohio | Democratic-Republican |
| Wayne L. Morse | 1945–1952 | Oregon | Republican |
| 1952–1955 | Independent | ||
| 1955–1969 | Democratic | ||
| Jackson Morton | 1849–1855 | Florida | Whig |
| Oliver H. P. T. Morton | 1867–1877 | Indiana | Republican |
| Thruston Ballard Morton | 1957–1968 | Kentucky | Republican |
| Carol Moseley-Braun | 1993–1999 | Illinois | Democratic |
| George H. Moses | 1918–1933 | New Hampshire | Republican |
| John Moses | 1945 | North Dakota | Democratic |
| Frank Moss | 1959–1977 | Utah | Democratic |
| Alexander Mouton | 1837–1842 | Louisiana | Democratic |
| Daniel Patrick Moynihan | 1977–2001 | New York | Democratic |
| Peter Muhlenberg | 1801 | Pennsylvania | Democratic-Republican |
| Frederick W. Mulkey | 1907, 1918 |
Oregon | Republican |
| Karl Mundt | 1948–1973 | South Dakota | Republican |
| Abe Murdock | 1941–1947 | Utah | Democratic |
| Frank Murkowski | 1981–2002 | Alaska | Republican |
| Edward Murphy, Jr. | 1893–1899 | New York | Democratic |
| George Murphy | 1965–1971 | California | Republican |
| Maurice J. Murphy, Jr. | 1961–1962 | New Hampshire | Republican |
| Richard L. Murphy | 1933–1936 | Iowa | Democratic |
| James Edward Murray | 1934–1961 | Montana | Democratic |
| Edmund Muskie | 1959–1980 | Maine | Democratic |
| Francis J. Myers | 1945–1951 | Pennsylvania | Democratic |
| Henry L. Myers | 1911–1923 | Montana | Democratic |
Read more about this topic: List Of Former United States Senators
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