| Representative | Years | Party | District | Notes |
| William Albert | March 4, 1873 – March 4, 1875 | Republican | 5th | |
| William N. Andrews | March 4, 1919 – March 4, 1921 | Republican | 1st | |
| John Archer | March 4, 1811 – March 4, 1817 | Democratic-Republican | 6th | |
| Stevenson Archer | October 26, 1811 – March 4, 1817 | Democratic-Republican | 6th | |
| March 4, 1819 – March 4, 1821 | 7th | |
| Stevenson Archer | March 4, 1867 – March 4, 1875 | Democratic | 2nd | |
| George Baer, Jr. | March 4, 1797 – March 4, 1801 | Federalist | 4th | |
| March 4, 1815 – March 4, 1817 | |
| William B. Baker | March 4, 1895 – March 4, 1901 | Republican | 1st | |
| Harry S. Baldwin | January 3, 1943 – January 3, 1947 | Democratic | 2nd | |
| Isaac A. Barber | March 4, 1897 – March 4, 1899 | Republican | 1st | |
| Michael D. Barnes | January 3, 1979 – January 3, 1987 | Democratic | 8th | |
| John Barney | March 4, 1825 – March 4, 1829 | Adams | 5th | |
| Roscoe Bartlett | January 3, 1993 – January 3, 2013 | Republican | 6th | |
| Robert Bauman | August 21, 1973 – January 3, 1981 | Republican | 1st | |
| Thomas Bayly | March 4, 1817 – March 4, 1823 | Federalist | 8th | |
| James G. Beall | January 3, 1943 – January 3, 1953 | Republican | 6th | |
| John G. Beall, Jr. | January 3, 1969 – January 3, 1971 | Republican | 6th | |
| Carville Benson | November 5, 1918 – March 4, 1921 | Democratic | 2nd | |
| Helen D. Bentley | January 3, 1985 – January 3, 1995 | Republican | 2nd | |
| Albert Blakeney | March 4, 1901 – March 4, 1903 | Republican | 2nd | |
| March 4, 1921 – March 4, 1923 | |
| William P. Bolton | January 3, 1949 – January 3, 1951 | Democratic | 2nd | |
| William Samuel Booze | March 4, 1897 – March 4, 1899 | Republican | 3rd | |
| Richard Bowie | March 4, 1849 – March 4, 1853 | Whig | 1st | |
| Thomas F. Bowie | March 4, 1855 – March 4, 1859 | Democratic | 6th | |
| Walter Bowie | March 24, 1802 – March 4, 1805 | Democratic-Republican | 2nd | |
| Robert F. Bratton | March 4, 1893 – May 10, 1894 | Democratic | 1st | |
| Francis Brengle | March 4, 1843 – March 4, 1845 | Whig | 2nd | |
| Daniel Brewster | January 3, 1959 – January 3, 1963 | Democratic | 2nd | |
| Elias Brown | March 4, 1829 – March 4, 1831 | Jacksonian | 5th | |
| John Brown | March 4, 1809 – ????, 1810 | Democratic-Republican | 7th | Resigned after appointment as Clerk of Court of Queen Anne's County |
| John B. Brown | November 8, 1892 - March 4, 1893 | Democratic | 1st | |
| Beverly Byron | January 3, 1979 – January 3, 1993 | Democratic | 6th | |
| Goodloe Byron | January 3, 1971 – October 11, 1978 | Democratic | 6th | Died |
| Katharine Byron | May 27, 1941 – January 3, 1943 | Democratic | 6th | |
| William D. Byron | January 3, 1939 – February 27, 1941 | Democratic | 6th | Died |
| Charles B. Calvert | March 4, 1861 – March 4, 1863 | Unionist | 6th | |
| John Campbell | March 4, 1801 – March 4, 1811 | Federalist | 1st | |
| Ben Cardin | January 3, 1987 – January 3, 2007 | Democratic | 3rd | |
| Richard B. Carmichael | March 4, 1833 – March 4, 1835 | Jacksonian | 2nd | |
| Daniel Carroll | March 4, 1789 – March 4, 1791 | Pro-Administration | 6th | |
| James Carroll | March 4, 1839 – March 4, 1841 | Democratic | 4th | |
| John Causin | March 4, 1843 – March 4, 1845 | Whig | 1st | |
| Andrew G. Chapman | March 4, 1881 – March 4, 1883 | Democratic | 5th | |
| John G. Chapman | March 4, 1845 – March 4, 1849 | Whig | 1st | |
| Gabriel Christie | March 4, 1793 – March 4, 1795 | Anti-Administration | 6th | |
| March 4, 1795 – March 4, 1797 | Democratic-Republican | |
| March 4, 1799 – March 4, 1801 | |
| Linwood Clark | March 4, 1929 – March 4, 1931 | Republican | 2nd | |
| Charles P. Coady | November 4, 1913 – March 4, 1921 | Democratic | 3rd | |
| Charles E. Coffin | November 6, 1894 – March 4, 1897 | Republican | 5th | |
| William H. Cole | March 4, 1885` – July 8, 1886 | Democratic | 3rd | Died |
| William P. Cole, Jr. | March 4, 1927 – March 4, 1929 | Democratic | 2nd | |
| March 4, 1931 – October 26, 1942 | resigned to become judge of US Customs Court |
| Barnes Compton | March 4, 1885 – March 20, 1890 | Democratic | 5th | lost contested election |
| March 4, 1891 – May 15, 1894 | Resigned |
| Albert Constable | March 4, 1845 – March 4, 1847 | Democratic | 5th | |
| Benjamin Contee | March 4, 1789 – March 4, 1791 | Anti-Administration | 3rd | |
| Jeremiah Cosden | March 4, 1821 – March 19, 1822 | Democratic-Republican | 6th | lost contested election |
| Joseph S. Cottman | March 4, 1851 – March 4, 1853 | Independent Whig | 6th | |
| George W. Covington | March 4, 1881 – March 4, 1885 | Democratic | 1st | |
| J. Harry Covington | March 4, 1909 – September 30, 1914 | Democratic | 1st | Resigned |
| Leonard Covington | March 4, 1805 – March 4, 1807 | Democratic-Republican | 2nd | |
| John K. Cowen | March 4, 1895 – March 4, 1897 | Democratic | 4th | |
| Jeremiah Crabb | March 4, 1795 – June 1, 1796 | Federalist | 3rd | Resigned |
| William Craik | December 5, 1796 – March 4, 1801 | Federalist | 3rd | Resigned |
| John Creswell | March 4, 1863 – March 4, 1865 | Republican | 1st | |
| John W. Crisfield | March 4, 1861 – March 4, 1849 | Whig | 6th | |
| March 4, 1861 – March 4, 1863 | Unionist | 1st | |
| Thomas Culbreth | March 4, 1817 – March 4, 1821 | Democratic-Republican | 6th | |
| Elijah Cummings | April 16, 1996 – Present | Democratic | 7th | Incumbent |
| Thomas D'Alesandro, Jr. | January 3, 1939 – May 16, 1947 | Democratic | 3rd | Resigned to become Mayor of Baltimore |
| Henry W. Davis | March 4, 1855 – March 4, 1861 | Know Nothing | 4th | |
| March 4, 1863 – March 4, 1865 | Unconditional Unionist | 1st | |
| John Delaney | January 3, 2013 – Present | Democratic | 6th | Incumbent |
| John Dennis | March 4, 1797 – March 4, 1805 | Federalist | 8th | |
| John Dennis | March 4, 1837 – March 4, 1841 | Whig | 1st | |
| Littleton Dennis | March 4, 1833 – April 14, 1834 | Anti-Jacksonian | 1st | Died |
| James W. Denny | March 4, 1899 – March 4, 1901 | Democratic | 4th | |
| March 4, 1903 – March 4, 1905 | |
| George Dent | March 4, 1793 – March 4, 1795 | Pro-Administration | 1st | |
| March 4, 1795 – March 4, 1801 | Federalist | |
| James Devereux | January 3, 1951 – January 3, 1959 | Republican | 2nd | |
| Clement Dorsey | March 4, 1825 – March 4, 1829 | Adams | 1st | |
| March 4, 1829 – March 4, 1831 | Anti-Jacksonian |
|
| Gabriel Duvall | November 11, 1794 – March 4, 1795 | Anti-Administration | 2nd | |
| March 4, 1795 – March 28, 1796 | Democratic-Republican | Resigned after being appointed Chief Justice of General Court of Maryland |
| Roy Dyson | January 3, 1981 – January 3, 1991 | Democratic | 1st | |
| Benjamin Edwards | January 2, 1795 – March 4, 1795 | Pro-Administration | 3rd | |
| Donna Edwards | June 17, 2008 – Present | Democratic | 4th | Incumbent |
| Bob Ehrlich | January 3, 1995 – January 3, 2003 | Republican | 2nd | |
| Daniel Ellison | January 3, 1943 – January 3, 1945 | Republican | 4th | |
| Alexander Evans | March 4, 1847 – March 4, 1853 | Whig | 5th | |
| George H. Fallon | January 3, 1945 – January 3, 1971 | Democratic | 4th | |
| John Van Lear Findlay | March 4, 1883 – March 4, 1887 | Democratic | 4th | |
| John R. Foley | January 3, 1959 – January 3, 1961 | Democratic | 6th | |
| Uriah Forrest | March 4, 1793 – November 8, 1794 | Pro-Administration | 3rd | |
| John R. Franklin | March 4, 1853 – March 4, 1855 | Democratic | 1st | |
| Samuel Friedel | January 3, 1953 – January 3, 1971 | Democratic | 7th | |
| George Gale | March 4, 1789 – March 4, 1791 | Pro-Administration | 5th | |
| Levin Gale | March 4, 1827 – March 4, 1829 | Jacksonian | 6th | |
| Edward Garmatz | July 15, 1947 – January 3, 1973 | Democratic | 3rd | |
| Charles H. Gibson | March 4, 1885 – March 4, 1891 | Democratic | 1st | |
| Wayne Gilchrest | January 3, 1991 – January 3, 2009 | Republican | 1st | |
| John Gill, Jr. | March 4, 1905 – March 4, 1911 | Democratic | 4th | |
| John K. Cowen | March 4, 1895 – March 4, 1897 | Democratic | 4th | |
| Stephen W. Gambrill | November 4, 1924 – December 19, 1938 | Democratic | 5th | Died |
| Charles Goldsborough | March 4, 1805 – March 4, 1817 | Federalist | 8th | |
| Thomas A. Goldsborough | March 4, 1921 – April 5, 1939 | Democratic | 1st | Resigned having been appointed an associate justice of the District Court of the United States for the District of Columbia. |
| Gilbert Gude | January 3, 1967 – January 3, 1977 | Republican | 8th | |
| Samuel Hambleton | March 4, 1869 – March 4, 1873 | Democratic | 1st | |
| William T. Hamilton | March 4, 1849 – March 4, 1853 | Democratic | 2nd | |
| March 4, 1853 – March 4, 1855 | 4th | |
| Patrick Hamill | March 4, 1869 – March 4, 1871 | Democratic | 4th | |
| Edward Hammond | March 4, 1849 – March 4, 1853 | Democratic | 3rd | |
| Alexander Hanson | March 4, 1813 – ????, 1816 | Federalist | 3rd | Resigned |
| Andrew P. Harris | January 3, 2011 – Present | Republican | 1st | Incumbent |
| Benjamin G. Harris | March 4, 1863 – March 4, 1867 | Democratic | 5th | |
| James M. Harris | March 4, 1855 – March 4, 1861 | Know Nothing | 3rd | |
| William Hayward Jr. | March 4, 1823 – March 4, 1825 | Crawford Democratic-Republican | 7th | |
| James P. Heath | March 4, 1833 – March 4, 1835 | Jacksonian | 4th | |
| Eli J. Henkle | March 4, 1875 – March 4, 1881 | Democratic | 5th | |
| John C. Herbert | March 4, 1815 – March 4, 1819 | Federalist | 2nd | |
| Daniel M. Henry | March 4, 1877 – March 4, 1881 | Democratic | 1st | |
| Winder L. Henry | November 6, 1894 – March 4, 1895 | Democratic | 1st | |
| Daniel Hiester | March 4, 1801 – March 7, 1804 | Democratic-Republican | 4th | Died |
| John Hill | March 4, 1921 – March 4, 1927 | Republican | 3rd | |
| Solomon Hillen, Jr. | March 4, 1839 – March 4, 1841 | Democratic | 4th | |
| William Hindman | January 30, 1793 – March 4, 1793 | Pro-Administration | 2nd | |
| March 4, 1793 – March 4, 1795 | 7th | |
| March 4, 1795 – March 4, 1799 | Federalist | |
| Fetter S. Hoblitzell | March 4, 1881` – March 4, 1885 | Democratic | 3rd | |
| Henry W. Hoffman | March 4, 1855 – March 4, 1857 | Know Nothing | 5th | |
| Lawrence Hogan | January 3, 1969 – January 3, 1975 | Republican | 5th | |
| Marjorie Holt | January 3, 1973 – January 3, 1987 | Republican | 4th | |
| Hart B. Holton | March 4, 1929 – March 4, 1931 | Republican | 5th | |
| Benjamin C. Howard | March 4, 1829 – March 4, 1833 | Jacksonian | 5th | |
| March 4, 1835 – March 4, 1837 | 4th | |
| March 4, 1837 – March 4, 1839 | Democratic | 4th | |
| Steny Hoyer | May 19, 1981 – Present | Democratic | 5th | Incumbent |
| George W. Hughes | March 4, 1859 – March 4, 1861 | Democratic | 6th | |
| DeWitt Hyde | January 3, 1953 – January 3, 1959 | Republican | 6th | |
| William H. Jackson | March 4, 1901 – March 4, 1905 | Republican | 1st | |
| March 4, 1907 – March 4, 1909 | |
| Daniel Jenifer | March 4, 1831 – March 4, 1833 | Anti-Jacksonian | 1st | |
| March 4, 1835 – March 4, 1837 | 7th | |
| March 4, 1837 – March 4, 1841 | Whig | |
| Thomas F. Johnson | January 3, 1959 – January 3, 1963 | Democratic | 1st | |
| William C. Johnson | March 4, 1833 – March 4, 1835 | Anti-Jacksonian | 6th | |
| March 4, 1837 – March 4, 1843 | Whig | 5th | |
| Isaac D. Jones | March 4, 1841 – March 4, 1843 | Whig | 1st | |
| Ambrose J. Kennedy | November 8, 1932 – January 3, 1941 | Democratic | 4th | |
| John P. Kennedy | April 25, 1838 – March 4, 1839 | Whig | 4th | |
| March 4, 1841 – March 4, 1845 | |
| Joseph Kent | March 4, 1811 – March 4, 1815 | Democratic-Republican | 2nd | |
| March 4, 1819 – March 4, 1823 | |
| March 4, 1823 – March 4, 1825 | Adams-Clay Democratic-Republican | |
| March 4, 1825 – January 6, 1826 | Adams | Resigned after being elected Governor of Maryland |
| John B. Kerr | March 4, 1849 – March 4, 1851 | Whig | 6th | |
| John Leeds Kerr | March 4, 1825 – March 4, 1829 | Adams | 7th | |
| March 4, 1831 – March 4, 1833 | Anti-Jacksonian | |
| Josiah Kerr | November 6, 1900 – March 4, 1901 | Republican | 1st | |
| Philip Key | March 4, 1807 – March 4, 1813 | Federalist | 3rd | |
| William Kimmel | March 4, 1877 – March 4, 1881 | Democratic | 3rd | |
| George Konig | March 4, 1911 – May 31, 1913 | Democratic | 3rd | |
| Frank Kratovil | January 3, 2009 – January 3, 2011 | Democratic | 1st | |
| John Kronmiller | March 4, 1909 – March 4, 1911 | Republican | 3rd | |
| Jacob M. Kunkel | March 4, 1857` – March 4, 1861 | Democratic | 5th | |
| Richard Lankford | January 3, 1955 – January 3, 1965 | Democratic | 5th | |
| Cornelius Leary | March 4, 1861 – March 4, 1863 | Unconditional Unionist | 3rd | |
| John Lee | March 4, 1823 – March 4, 1825 | Jacksonian Federalist | 4th | |
| David J. Lewis | March 4, 1911 – March 4, 1917 | Democratic | 6th | |
| March 4, 1931 – January 3, 1939 | |
| Thomas W. Ligon | March 4, 1845 – March 4, 1849 | Democratic | 3rd | |
| John C. Linthicum | March 4, 1911 – October 5, 1932 | Democratic | 4th | Died |
| Peter Little | March 4, 1811 – March 4, 1813 | Democratic-Republican | 5th | |
| September 2, 1816 – March 4, 1823 | |
| March 4, 1823 – March 4, 1825 | Jacksonian Democratic-Republican | |
| March 4, 1825 – March 4, 1829 | Adams | |
| Edward Lloyd | December 3, 1806 – March 4, 1809 | Democratic-Republican | 7th | |
| Clarence Long | January 3, 1963 – January 3, 1985 | Democratic | 2nd | |
| Edward H. C. Long | March 4, 1845 – March 4, 1847 | Whig | 6th | |
| Lloyd Lowndes, Jr. | March 4, 1873 – March 4, 1875 | Republican | 6th | |
| Hervey Machen | January 3, 1965 – January 3, 1969 | Democratic | 5th | |
| Patrick Magruder | March 4, 1805 – March 4, 1807 | Democratic-Republican | 3rd | |
| Robert N. Martin | March 4, 1825 – March 4, 1827 | Adams | 8th | |
| John T. Mason, Jr. | March 4, 1841 – March 4, 1843 | Democratic | 6th | |
| Charles Mathias | January 3, 1961 – January 3, 1969 | Republican | 6th | |
| William Matthews | March 4, 1797 – March 4, 1799 | Federalist | 6th | |
| Henry May | March 4, 1853 – March 4, 1855 | Democratic | 5th | |
| March 4, 1861 – March 4, 1863 | Unionist | 1st | |
| Louis E. McComas | March 4, 1883 – March 4, 1891 | Republican | 6th | |
| William McCreery | March 4, 1803 – March 4, 1809 | Democratic-Republican | 5th | |
| Hiram McCullough | March 4, 1865 – March 4, 1869 | Democratic | 1st | |
| John McDonald | March 4, 1897 – March 4, 1899 | Republican | 6th | |
| William W. McIntire | March 4, 1897 – March 4, 1899 | Republican | 4th | |
| William M. McKaig | March 4, 1891 – March 4, 1895 | Democratic | 6th | |
| Alexander McKim | March 4, 1809 – March 4, 1815 | Democratic-Republican | 5th | |
| Isaac McKim | January 4, 1823 – March 4, 1823 | Democratic-Republican | 5th | |
| March 4, 1823 – March 4, 1825 | Jacksonian Democratic-Republican | |
| March 4, 1833 – March 4, 1835 | Jacksonian | |
| March 4, 1835 – April 1, 1838 | 4th | Died |
| Robert M. McLane | March 4, 1847 – March 4, 1851 | Democratic | 4th | |
| March 4, 1879 – March 4, 1883 | |
| Charles T. McMillen | January 3, 1987 – January 3, 1993 | Democratic | 4th | |
| Hugh Meade | January 3, 1947 – January 3, 1949 | Democratic | 2nd | |
| John F. Mercer | February 5, 1792 – March 4, 1793 | Anti-Administration | 3rd | |
| March 4, 1793 – April 13, 1794 | 2nd | Resigned |
| William M. Merrick | March 4, 1871 – March 4, 1873 | Democratic | 5th | |
| John A. Meyer | January 3, 1941 – January 3, 1943 | Democratic | 4th | |
| Kweisi Mfume | January 3, 1987 – February 15, 1996 | Democratic | 7th | Resigned to become CEO of the NAACP |
| Barbara Mikulski | January 3, 1977 – January 3, 1987 | Democratic | 3rd | |
| Joshua W. Miles | March 4, 1895 – March 4, 1897 | Democratic | 1st | |
| Edward T. Miller | January 3, 1947 – January 3, 1959 | Republican | 1st | |
| William O. Mills | May 25, 1971 – May 24, 1973 | Republican | 1st | Died |
| George E. Mitchell | March 4, 1823 – March 4, 1825 | Adams-Clay Democratic-Republican | 6th | |
| March 4, 1825 – March 4, 1827 | Jacksonian | |
| December 7, 1829 – June 28, 1832 | Died |
| Parren Mitchell | January 3, 1971 – January 3, 1987 | Democratic | 7th | |
| John Montgomery | March 4, 1807 – April 29, 1811 | Democratic-Republican | 6th | resigned after being appointed Attorney General of Maryland |
| Nicholas R. Moore | March 4, 1803 – March 4, 1811 | Democratic-Republican | 5th | |
| March 4, 1813 – ????, 1815 | Resigned before the convening of the 14th Congress |
| Connie Morella | January 3, 1987 – January 3, 2003 | Republican | 8th | |
| Rogers Morton | January 3, 1963 – January 29, 1971 | Republican | 1st | Resigned having been appointed United States Secretary of the Interior |
| Sydney E. Mudd I | March 20, 1890 – March 4, 1891 | Republican | 5th | |
| March 4, 1897 – March 4, 1911 | |
| Sydney E. Mudd II | March 4, 1915 – October 11, 1924 | Republican | 5th | Died |
| William V. Murray | March 4, 1791 – March 4, 1793 | Pro-Administration | 5th | |
| March 4, 1793 – March 4, 1795 | 8th | |
| March 4, 1795 – March 4, 1797 | Federalist | |
| Raphael Neale | March 4, 1819 – March 4, 1823 | Federalist | 1st | |
| March 4, 1823 – March 4, 1825 | Adams-Clay Federalist | |
| John Nelson | March 4, 1821 – March 4, 1823 | Democratic-Republican | 4th | |
| Roger Nelson | November 6, 1804 – May 14, 1810 | Democratic-Republican | 4th | Resigned to become associate justice of Maryland's 5th judicial circuit |
| Joseph H. Nicholson | March 4, 1799 – March 1, 1806 | Democratic-Republican | 7th | Resigned |
| William J. O'Brien | March 4, 1873 – March 4, 1877 | Democratic | 3rd | |
| Henry Page | March 4, 1891 – September 3, 1892 | Democratic | 1st | Resigned to become a judge of the Maryland Court of Appeals |
| Vincent L. Palmisano | March 4, 1927` – January 3, 1939 | Democratic | 3rd | |
| Thomas Parran, Sr. | March 4, 1911 – March 4, 1913 | Republican | 5th | |
| James Pearce | March 4, 1835 – March 4, 1839 | Whig | 2nd | |
| March 4, 1841 – March 4, 1843 | |
| George A. Pearre | March 4, 1899 – March 4, 1911 | Republican | 6th | |
| Thomas J. Perry | March 4, 1845 – March 4, 1847 | Democratic | 2nd | |
| George Peter | October 7, 1816 – March 4, 1819 | Federalist | 3rd | |
| March 4, 1825 – March 4, 1827 | Jacksonian | |
| Charles E. Phelps | March 4, 1865 – March 4, 1867 | Unconditional Unionist | 3rd | |
| March 4, 1867 – March 4, 1869 | Conservative | |
| William Pinkney | March 4, 1791 – November ??, 1791 | Pro-Administration | 3rd | Resigned |
| March 4, 1815 – April 18, 1816 | Democratic-Republican | 5th | Resigned after being appointed Minister Plenipotentiary to Russia |
| Thomas Plater | March 4, 1801 – March 4, 1805 | Federalist | 3rd | |
| Jacob A. Preston | March 4, 1843 – March 4, 1845 | Whig | 5th | |
| Jesse Price | November 3, 1914 – March 4, 1919 | Democratic | 1st | |
| Alexander Randall | March 4, 1841 – March 4, 1843 | Whig | 4th | |
| Isidor Rayner | March 4, 1887 – March 4, 1889 | Democratic | 4th | |
| March 4, 1891 – March 4, 1895 | |
| Philip Reed | March 4, 1817 – March 4, 1819 | Democratic-Republican | 7th | |
| March 19, 1822 – March 4, 1823 | 6th | |
| James B. Ricaud | March 4, 1855 – March 4, 1859 | Know Nothing | 2nd | |
| Samuel Ringgold | October 15, 1810 – March 4, 1815 | Democratic-Republican | 4th | |
| March 4, 1817 – March 4, 1821 | |
| John Ritchie | March 4, 1871 – March 4, 1873 | Democratic | 4th | |
| Charles B. Roberts | March 4, 1875 – March 4, 1879 | Democratic | 2nd | |
| Dudley Roe | January 3, 1945 – January 3, 1947 | Democratic | 1st | |
| James D. Roman | March 4, 1847 – March 4, 1849 | Whig | 2nd | |
| Dutch Ruppersberger | January 3, 2003 – Present | Democratic | 2nd | Incumbent |
| Harry W. Rusk | November 2, 1886` – March 4, 1897 | Democratic | 3rd | |
| John Sarbanes | January 3, 2007 – Present | Democratic | 3rd | Incumbent |
| Paul Sarbanes | January 3, 1971 – January 3, 1973 | Democratic | 4th | |
| January 3, 1973 – January 3, 1977 | 3rd | |
| Lansdale G. Sasscer | February 3, 1939 – January 3, 1953 | Democratic | 5th | |
| Charles R. Schirm | March 4, 1901 – March 4, 1903 | Republican | 4th | |
| Benedict J. Semmes | March 4, 1829 – March 4, 1833 | Anti-Jacksonian | 2nd | |
| Joshua Seney | March 4, 1789 – December 6, 1792 | Anti-Administration | 2nd | resigned to become Chief Justice of Maryland's 3rd Judicial District |
| Charles S. Sewall | October 1, 1832 – March 4, 1833 | Jacksonian | 6th | |
| January 2, 1843 – March 4, 1843 | Democratic | 3rd | |
| Frank T. Shaw | March 4, 1885 – March 4, 1889 | Democratic | 2nd | |
| Upton Sheredine | March 4, 1791 – March 4, 1793 | Anti-Administration | 6th | |
| Jacob Shower | March 4, 1853 – March 4, 1855 | Democratic | 2nd | |
| Carlton R. Sickles | January 3, 1963 – January 3, 1967 | Democratic | At-large | |
| Frank Small, Jr. | January 3, 1953 – January 3, 1955 | Republican | 5th | |
| Frank O. Smith | March 4, 1913 – March 4, 1915 | Democratic | 5th | |
| John W. Smith | March 4, 1899 – January 12, 1900 | Democratic | 1st | Resigned to become Governor of Maryland |
| Samuel Smith | March 4, 1793 – March 4, 1803 | Democratic-Republican | 5th | |
| January 31, 1816 – December 17, 1822 | Resigned after being elected to the US Senate |
| Thomas A. Smith | March 4, 1905 – March 4, 1907 | Democratic | 1st | |
| William Smith | March 4, 1789 – March 4, 1791 | Anti-Administration | 4th | |
| Augustus R. Sollers | March 4, 1841 – March 4, 1843 | Whig | 7th | |
| March 4, 1853 – March 4, 1855 | 6th | |
| Gladys Spellman | January 3, 1975 – January 3, 1981 | Democratic | 5th | |
| John S. Spence | March 4, 1823 – March 4, 1825 | Adams-Clay Democratic-Republican | 8th | |
| Thomas A. Spence | March 4, 1843 – March 4, 1845 | Whig | 6th | |
| Michael Sprigg | March 4, 1827 – March 4, 1831 | Jacksonian | 4th | |
| Richard Sprigg, Jr. | May 5, 1796 – March 4, 1799 | Democratic-Republican | 2nd | |
| March 4, 1801 – February 11, 1802 | Resigned |
| Thomas Sprigg | March 4, 1793 – March 4, 1793 | Anti-Administration | 4th | |
| March 4, 1795 – March 4, 1797 | Democratic-Republican | |
| John N. Steele | May 29, 1834 – March 4, 1837 | Anti-Jacksonian | 1st | |
| Newton Steers | January 3, 1977 – January 3, 1979 | Republican | 8th | |
| Samuel Sterett | March 4, 1791 – March 4, 1793 | Anti-Administration | 4th | |
| John T. Stoddert | March 4, 1833 – March 4, 1835 | Jacksonian | 8th | |
| Frederick Stone | March 4, 1867 – March 4, 1871 | Democratic | 5th | |
| Michael J. Stone | March 4, 1789 – March 4, 1791 | Anti-Administration | 1st | |
| Henry Stockbridge, Jr. | March 4, 1889 – March 4, 1891 | Republican | 4th | |
| Philip Stuart | March 4, 1811 – March 4, 1819 | Federalist | 1st | |
| Herman Stump | March 4, 1889 – March 4, 1893 | Democratic | 2nd | |
| Thomas Swann | March 4, 1869 – March 4, 1873 | Democratic | 3rd | |
| March 4, 1873 – March 4, 1879 | 4th | |
| Joshua F. C. Talbott | March 4, 1879 – March 4, 1885 | Democratic | 2nd | |
| March 4, 1893 – March 4, 1895 | |
| March 4, 1903 – October 5, 1918 | Died |
| Francis Thomas | March 4, 1831 – March 4, 1833 | Jacksonian | 4th | |
| March 4, 1833 – March 4, 1835 | 7th | |
| March 4, 1835 – March 4, 1837 | 6th | |
| March 4, 1837 – March 4, 1841 | Democratic | |
| March 4, 1861 – March 4, 1863 | Unionist | 5th | |
| March 4, 1863 – March 4, 1867 | Unconditional Unionist | 4th | |
| March 4, 1867 – March 4, 1869 | Republican | |
| John C. Thomas | March 4, 1799 – March 4, 1801 | Federalist | 2nd | |
| John L. Thomas, Jr. | December 4, 1865 – March 4, 1867 | Unconditional Unionist | 2nd | |
| Philip F. Thomas | March 4, 1839 – March 4, 1841 | Democratic | 2nd | |
| March 4, 1875 – March 4, 1877 | 1st | |
| James Turner | March 4, 1833 – March 4, 1837 | Jacksonian | 3rd | |
| Millard Tydings | March 4, 1923 – March 4, 1927 | Democratic | 2nd | |
| Milton Urner | March 4, 1879 – March 4, 1883 | Republican | 6th | |
| Chris Van Hollen | January 3, 2003 – Present | Democratic | 8th | Incumbent |
| Archibald Van Horne | March 4, 1807 – March 4, 1811 | Democratic-Republican | 2nd | |
| Joshua Van Sant | March 4, 1853 – March 4, 1855 | Democratic | 3rd | |
| Frank C. Wachter | March 4, 1899 – March 4, 1907 | Democratic | 3rd | |
| Thomas Y. Walsh | March 4, 1851 – March 4, 1853 | Whig | 4th | |
| William Walsh | March 4, 1875 – March 4, 1879 | Democratic | 6th | |
| David J. Ward | June 8, 1939 – January 3, 1945 | Democratic | 1st | |
| Henry Warfield | March 4, 1827 – March 4, 1829 | Federalist | 3rd | |
| March 4, 1823 – March 4, 1825 | Adams-Clay Federalist | |
| George Corbin Washington | March 4, 1819 – March 4, 1823 | Adams | 3rd | |
| March 4, 1829 – March 4, 1833 | Anti-Jacksonian | |
| March 4, 1835 – March 4, 1837 | 5th | |
| Edwin H. Webster | March 4, 1859 – March 4, 1861 | Know Nothing | 2nd | |
| March 4, 1861 – March 4, 1863 | Unionist | |
| March 4, 1863 – July ??, 1865 | Unconditional Unionist | Resigned after being appointed collector of customs at the port of Baltimore |
| John C. Weems | February 1, 1826 – March 4, 1829 | Jacksonian | 2nd | |
| George L. Wellington | March 4, 1895 – March 4, 1897 | Republican | 6th | |
| John Wethered | March 4, 1843 – March 4, 1845 | Whig | 3rd | |
| James W. Williams | March 4, 1841 – December 2, 1842 | Democratic | 3rd | Died |
| Ephraim K Wilson | March 4, 1827 – March 4, 1829 | Adams | 8th | |
| March 4, 1829 – March 4, 1831 | Jacksonian | |
| Ephraim K. Wilson II | March 4, 1873 – March 4, 1875 | Democratic | 1st | |
| Harry B. Wolf | March 4, 1907 – March 4, 1909 | Democratic | 3rd | |
| John T. H. Worthington | March 4, 1831 – March 4, 1833 | Jacksonian | 5th | |
| March 4, 1837 – March 4, 1841 | Democratic | 3rd | |
| Thomas C. Worthington | March 4, 1825 – March 4, 1827 | Adams | 4th | |
| Robert Wright | November 29, 1810 – March 4, 1817 | Democratic-Republican | 7th | |
| March 4, 1821 – March 4, 1823 | |
| Albert Wynn | January 3, 1993 – May 31, 2008 | Democratic | 4th | Resigned |
| Frederick N. Zihlman | March 4, 1917 – March 4, 1931 | Republican | 6th | |