| Senate Name | County | Dist. # | Party | Session # | Dates | Notes |
|---|
|
|
| MacDade, Albert Dutton | 9 | Delaware | Rep | 124 | 1921-22 |
| MacDade, Albert Dutton | 9 | Delaware | Rep | 125 | 1923-24 |
| MacDade, Albert Dutton | 9 | Delaware | Rep | 126 | 1925-26 |
| MacDade, Albert Dutton | 9 | Delaware | Rep | 127 | 1927-28 |
| MacFarlane, John J. | 4 | Philadelphia (Part) | Rep | 105 | 1883-84 |
| MacFarlane, John J. | 4 | Philadelphia (Part) | Rep | 106 | 1885-86 |
| MacFarlane, John J. | 4 | Philadelphia (Part) | Rep | 107 | 1887-88 |
| MacFarlane, John J. | 4 | Philadelphia (Part) | Rep | 108 | 1889-90 |
| Maclay, David | 27 | Clarion, Armstrong, Jefferson, Forest | Rep | 97 | 1873 |
| Maclay, David | 27 | Clarion, Armstrong, Jefferson, Forest | Rep | 98 | 1874 |
| Maclay, David | 38 | Cameron, Clarion, Elk, Forest | Rep | 99 | 1875 |
| Maclay, Robert P. | 8 | Huntingdon, Mifflin, Juniata, Perry, Union | Whig | 63 | 1838-39 |
| Maclay, Robert P. | 8 | Huntingdon, Mifflin, Juniata, Perry, Union | Whig | 64 | 1839-40 |
| Maclay, Robert P. | 8 | Huntingdon, Mifflin, Juniata, Perry, Union | Whig | 65 | 1841 |
| Maclay, Robert P. | 8 | Huntingdon, Mifflin, Juniata, Perry, Union | Whig | 66 | 1842 |
| Maclay, Samuel | | Northumberland, Luzerne, Mifflin | Rep | 23 | 1798-99 |
| Maclay, Samuel | | Northumberland, Luzerne, Mifflin | Rep | 24 | 1799-1800 |
| Maclay, Samuel | | Northumberland, Luzerne, Mifflin | Rep | 25 | 1800-01 |
| Maclay, Samuel | | Northumberland | Rep | 26 | 1801-02 |
| Maclay, Samuel | | Northumberland | Rep | 27 | 1802-03 |
| Madigan, Albert E. | 23 | Bradford, Wyoming, Susquehanna | Rep | 140 | 1953-54 |
| Madigan, Albert E. | 23 | Bradford, Wyoming, Susquehanna | Rep | 141 | 1955-56 |
| Madigan, Albert E. | 23 | Bradford, Wyoming, Susquehanna | Rep | 142 | 1957-58 |
| Madigan, Albert E. | 23 | Bradford, Wyoming, Susquehanna | Rep | 143-4 | 1959-60 |
| Madigan, Albert E. | 23 | Bradford, Wyoming, Susquehanna | Rep | 145-6 | 1961-62 |
| Madigan, Albert E. | 23 | Bradford, Wyoming, Susquehanna | Rep | 147-8 | 1963-64 |
| Madigan, Albert E. | 23 | Bradford, Wyoming, Susquehanna, Tioga | Rep | 149-50 | 1965-66 |
| Madigan, Albert E. | 23 | Potter, Bradford, Lycoming, Sullivan, Tioga | Rep | 151-2 | 1967-68 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 169-70 | 1985-86 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 171-2 | 1987-88 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 173-4 | 1989-90 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 175-6 | 1991-92 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 177-8 | 1993-94 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 179-80 | 1995-96 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 181-2 | 1997-98 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 183-4 | 1999-00 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 185-6 | 2001-02 |
| Madigan, Roger A. | 23 | Lycoming, Sullivan, Tioga, Bradford, Union (Part) | Rep | 187-8 | 2003-04 |
| Magee, C. L. | 43 | Allegheny (Part) | Rep | 112 | 1897-98 |
| Magee, C. L. | 43 | Allegheny (Part) | Rep | 113 | 1899-00 |
| Magee, C. L. | 43 | Allegheny (Part) | Rep | 114 | 1901-02 |
| Magee, Charles J. | 43 | Allegheny (Part) | Rep | 120 | 1913-14 |
| Magee, Charles J. | 43 | Allegheny (Part) | Rep | 121 | 1915-16 |
| Magee, Charles J. | 43 | Allegheny (Part) | Rep | 122 | 1917-18 |
| Magee, William A., Jr. | 43 | Allegheny (Part) | Rep | 114 | 1901-02 |
| Magee, William A., Jr. | 43 | Allegheny (Part) | Rep | 115 | 1903-04 |
| Maghee, William | | Philadelphia City, Philadelphia | Fed | 39 | 1814-15 |
| Maghee, William | 1 | Philadelphia City, Philadelphia | Fed | 40 | 1815-16 |
| Maghee, William | 1 | Philadelphia City, Philadelphia | Fed | 41 | 1816-17 |
| Maghee, William | 1 | Philadelphia City, Philadelphia | Fed | 42 | 1817-18 |
| Mahady, Paul W. | 39 | Westmoreland | Dem | 143-4 | 1959-60 |
| Mahady, Paul W. | 39 | Westmoreland | Dem | 145-6 | 1961-62 |
| Mahady, Paul W. | 39 | Westmoreland | Dem | 147-8 | 1963-64 |
| Mahady, Paul W. | 39 | Westmoreland | Dem | 149-50 | 1965-66 |
| Mahady, Paul W. | 39 | Westmoreland (Part) | Dem | 151-2 | 1967-68 |
| Mahady, Paul W. | 39 | Westmoreland (Part) | Dem | 153-4 | 1969-70 |
| Mahady, Paul W. | 39 | Westmoreland (Part) | Dem | 155-6 | 1971-72 |
| Mahany, Rowland B. | 50 | Crawford, Mercer | Rep | 137 | 1947-48 |
| Mahany, Rowland B. | 50 | Crawford, Mercer | Rep | 138 | 1949-50 |
| Mahany, Rowland B. | 50 | Crawford, Mercer | Rep | 139 | 1951-52 |
| Mahany, Rowland B. | 50 | Crawford, Mercer | Rep | 140 | 1953-54 |
| Mahany, Rowland B. | 50 | Crawford, Mercer | Rep | 141 | 1955-56 |
| Mahany, Rowland B. | 50 | Crawford, Mercer | Rep | 142 | 1957-58 |
| Mahany, Rowland B. | 50 | Crawford, Mercer | Rep | 147-8 | 1963-64 |
| Mahany, Rowland B. | 50 | Crawford, Mercer | Rep | 149-50 | 1965-66 |
| Mahany, Rowland B. | 50 | Crawford, Mercer, Erie (Part) | Rep | 151-2 | 1967-68 |
| Mahon, Alexander | 13 | Cumberland, Perry | Dem | 46 | 1821-22 |
| Mahon, Alexander | 16 | Cumberland, Perry | Dem | 47 | 1822-23 |
| Mahon, Alexander | 16 | Cumberland, Perry | Dem | 48 | 1823-24 |
| Mahon, Alexander | 16 | Cumberland, Perry | Dem | 49 | 1824-25 |
| Mahon, Alexander | 16 | Cumberland, Perry | Dem | 50 | 1825-26 |
| Mahon, Alexander | 16 | Cumberland, Perry | Dem | 51 | 1826-27 |
| Mahon, Alexander | 16 | Cumberland, Perry | Dem | 52 | 1827-28 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 131 | 1935-36 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 132 | 1937-38 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 133 | 1939-40 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 134 | 1941-42 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 135 | 1943-44 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 136 | 1945-46 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 137 | 1947-48 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 138 | 1949-50 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 139 | 1951-52 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 140 | 1953-54 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 141 | 1955-56 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 142 | 1957-58 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 143-4 | 1959-60 |
| Mallery, Charles R. | 30 | Huntingdon, Blair | Rep | 145-6 | 1961-62 |
| Malone, Benjamin | 6 | Bucks | Whig | 74 | 1850 |
| Malone, Benjamin | 6 | Bucks | Whig | 75 | 1851 |
| Malone, Benjamin | 6 | Bucks | Whig | 76 | 1852 |
| Manbeck, Clarence F. | 48 | Lebanon, Berks (Part), Lancaster (Part) | Rep | 153-4 | 1969-70 |
| Manbeck, Clarence F. | 48 | Lebanon, Berks (Part), Lancaster (Part) | Rep | 155-6 | 1971-72 |
| Manbeck, Clarence F. | 48 | Lebanon (Part), Berks (Part), Lancaster (Part) | Rep | 157-8 | 1973-74 |
| Manbeck, Clarence F. | 48 | Lebanon (Part), Berks (Part), Lancaster (Part) | Rep | 159-60 | 1975-76 |
| Manbeck, Clarence F. | 48 | Lebanon (Part), Berks (Part), Lancaster (Part) | Rep | 161-2 | 1977-78 |
| Manbeck, Clarence F. | 48 | Lebanon (Part), Berks (Part), Lancaster (Part) | Rep | 163-4 | 1979-80 |
| Manbeck, Clarence F. | 48 | Lebanon (Part), Berks (Part), Lancaster (Part) | Rep | 165-6 | 1981-82 |
| Manbeck, William H. | 31 | Juniata, Mifflin, Perry | Rep | 116 | 1905-06 |
| Manbeck, William H. | 31 | Juniata, Mifflin, Perry, Cumberland | Rep | 117 | 1907-08 |
| Manbeck, William H. | 31 | Juniata, Mifflin, Perry, Cumberland | Rep | 118 | 1909-10 |
| Manbeck, William H. | 31 | Juniata, Mifflin, Perry, Cumberland | Rep | 119 | 1911-12 |
| Mann, David | 14 | Bedford, Cambria, Somerset | Dem | 46 | 1821-22 |
| Mann, David | 22 | Bedford, Somerset | Dem | 47 | 1822-23 |
| Mann, David | 22 | Bedford, Somerset | Dem | 48 | 1823-24 |
| Mann, Joel K. | 3 | Montgomery | Dem | 48 | 1823-24 |
| Mann, Joel K. | 3 | Montgomery | Dem | 49 | 1824-25 |
| Mann, Joel K. | 3 | Montgomery | Dem | 50 | 1825-26 |
| Mann, Joel K. | 3 | Montgomery | Dem | 51 | 1826-27 |
| Mansfield, William D. | 44 | Allegheny (Part) | Rep | 125 | 1923-24 |
| Mansfield, William D. | 44 | Allegheny (Part) | Rep | 126 | 1925-26 |
| Mansfield, William D. | 44 | Allegheny (Part) | Rep | 127 | 1927-28 |
| Mansfield, William D. | 44 | Allegheny (Part) | Rep | 128 | 1929-30 |
| Mansfield, William D. | 44 | Allegheny (Part) | Rep | 129 | 1931-32 |
| Mansfield, William D. | 44 | Allegheny (Part) | Rep | 130 | 1933-34 |
| Margie, Peter M. | 21 | Luzerne (Part) | Dem | 136 | 1945-46 |
| Margie, Peter M. | 21 | Luzerne (Part) | Dem | 137 | 1947-48 |
| Markley, A. D. | 12 | Montgomery | Dem | 109 | 1891-92 |
| Markley, A. D. | 12 | Montgomery | Dem | 110 | 1893-94 |
| Markley, Philip S. | 7 | Montgomery | Dem | 44 | 1819-20 |
| Markley, Philip S. | 7 | Montgomery | Dem | 45 | 1820-21 |
| Markley, Philip S. | 7 | Montgomery | Dem | 46 | 1821-22 |
| Markley, Philip S. | 3 | Montgomery | Dem | 47 | 1822-23 |
| Marks, Bruce S. | 2 | Philadelphia (Part) | Rep | 177-8 | 1993-94 |
| Marks, William | 19 | Allegheny, Armstrong, Beaver, Butler | Dem | 44 | 1819-20 |
| Marks, William | 19 | Allegheny, Armstrong, Beaver, Butler | Dem | 45 | 1820-21 |
| Marks, William | 19 | Allegheny, Armstrong, Beaver, Butler | Dem | 46 | 1821-22 |
| Marks, William | 21 | Allegheny, Beaver, Butler | Dem | 47 | 1822-23 |
| Marks, William | 21 | Allegheny, Beaver, Butler | Dem | 48 | 1823-24 |
| Marks, William | 21 | Allegheny, Beaver, Butler | Dem | 49 | 1824-25 |
| Marlow, George | 28 | York | Rep | 123 | 1919-20 |
| Marlow, George | 28 | York | Rep | 124 | 1921-22 |
| Marselis, Isaac N. | 1 | Philadelphia | Dem | 82 | 1858 |
| Marselis, Isaac N. | 1 | Philadelphia | Dem | 83 | 1859 |
| Marselis, Isaac N. | 1 | Philadelphia | Dem | 84 | 1860 |
| Martin, David | 8 | Philadelphia (Part) | Rep | 113 | 1899-00 |
| Martin, David | 8 | Philadelphia (Part) | Rep | 114 | 1901-02 |
| Martin, David | 5 | Philadelphia (Part) | Rep | 122 | 1917-18 |
| Martin, David | 5 | Philadelphia (Part) | Rep | 123 | 1919-20 |
| Martin, Franklin | 31 | Juniata, Mifflin, Perry, Cumberland | Rep | 120 | 1913-14 |
| Martin, Franklin | 31 | Juniata, Mifflin, Perry, Cumberland | Rep | 121 | 1915-16 |
| Martin, James | | Allegheny, Beaver, Butler | Rep | 30 | 1805-06 |
| Martin, James | | Allegheny, Beaver, Butler | Rep | 31 | 1806-07 |
| Martin, James | | Allegheny, Beaver, Butler | Rep | 32 | 1807-08 |
| Martin, William A. | 32 | Cumberland, Adams | Dem | 107 | 1887-88 |
| Martin, William A. | 32 | Cumberland, Adams | Dem | 108 | 1889-90 |
| Martin, William A. | 33 | Franklin, Adams | Dem | 118 | 1909-10 |
| Martin, William A. | 33 | Franklin, Adams | Dem | 119 | 1911-12 |
| Mason, Gordon F. | 11 | Bradford, Tioga | Dem | 71 | 1847 |
| Mason, Gordon F. | 11 | Bradford, Tioga | Dem | 72 | 1848 |
| Mason, Gordon F. | 11 | Bradford, Tioga | Dem | 73 | 1849 |
| Mathers, James | 8 | Huntingdon, Mifflin, Juniata, Perry, Union | Whig | 65 | 1841 |
| Mathers, James | 8 | Huntingdon, Mifflin, Juniata, Perry, Union | Whig | 66 | 1842 |
| Mathers, James | 8 | Huntingdon, Mifflin, Juniata, Perry, Union | Whig | 67 | 1843 |
| Matheys, John | 3 | Montgomery | Dem | 56 | 1831-32 |
| Matheys, John | 3 | Montgomery | Dem | 57 | 1832-33 |
| Matheys, John | 3 | Montgomery | Dem | 58 | 1833-34 |
| Matheys, John | 3 | Montgomery | Dem | 59 | 1834-35 |
| Matson, Myron | 25 | McKean, Potter, Tioga | Rep | 114 | 1901-02 |
| Matson, Myron | 25 | McKean, Potter, Tioga | Rep | 115 | 1903-04 |
| Matson, Myron | 25 | McKean, Potter, Tioga | Rep | 116 | 1905-06 |
| Matson, Myron | 25 | McKean, Potter, Tioga | Rep | 117 | 1907-08 |
| Matthias, Benjamin | 1 | Philadelphia City | Whig | 72 | 1848 |
| Matthias, Benjamin | 1 | Philadelphia City | Whig | 73 | 1849 |
| Matthias, Benjamin | 1 | Philadelphia City | Whig | 74 | 1850 |
| Matthias, Benjamin | 1 | Philadelphia City | Whig | 75 | 1851 |
| Matthias, Benjamin | 1 | Philadelphia City | Whig | 76 | 1852 |
| Mayer, Christopher | | Lancaster | Rep | 29 | 1804-05 |
| Mayer, Christopher | | Lancaster | Quid | 30 | 1805-06 |
| Mayer, Christopher | | Lancaster | Fed | 31 | 1806-07 |
| Mayer, Christopher | | Lancaster | Fed | 32 | 1807-08 |
| Mayer, Christopher | | Lancaster | Fed | 33 | 1808-09 |
| Mayer, Christopher | | Lancaster | Fed | 34 | 1809-10 |
| Mayer, Christopher | | Lancaster | Fed | 35 | 1810-11 |
| Mayer, Christopher | | Lancaster | Fed | 36 | 1811-12 |
| Mazzei, Frank | 43 | Allegheny (Part) | Dem | 151-2 | 1967-68 |
| Mazzei, Frank | 43 | Allegheny (Part) | Dem | 159-60 | 1975-76 |
| Mazzei. Frank | 43 | Allegheny (Part) | Dem | 153-4 | 1969-70 |
| Mazzei. Frank | 43 | Allegheny (Part) | Dem | 155-6 | 1971-72 |
| Mazzei. Frank | 43 | Allegheny (Part) | Dem | 157-8 | 1973-74 |
| McAleer, William | 2 | Philadelphia (Part) | Dem | 107 | 1887-88 |
| McAleer, William | 2 | Philadelphia (Part) | Dem | 108 | 1889-90 |
| McArthur, William | | Crawford, Erie, Venango, Mercer, Warren | Rep | 26 | 1801-02 |
| McArthur, William | | Crawford, Erie, Venango, Mercer, Warren | Rep | 27 | 1802-03 |
| McArthur, William | | Crawford, Erie, Venango, Mercer, Warren | Rep | 28 | 1803-04 |
| McArthur, William | | Crawford, Erie, Venango, Mercer, Warren | Rep | 29 | 1804-05 |
| McArthur, William | | Crawford, Erie, Venango, Mercer, Warren | Rep | 30 | 1805-06 |
| McArthur, William | | Crawford, Erie, Venango, Mercer, Warren | Rep | 31 | 1806-07 |
| McArthur, William | | Crawford, Erie, Venango, Mercer, Warren | Rep | 32 | 1807-08 |
| McArthur, William | | Crawford, Erie, Venango, Mercer, Warren | Rep | 33 | 1808-09 |
| McAteer, H. J. | 33 | Franklin, Huntingdon | Dem | 106 | 1885-86 |
| McAteer, H. J. | 33 | Franklin, Huntingdon | Dem | 107 | 1887-88 |
| McCandless, Charles | 25 | Beaver, Butler | Rep | 87 | 1863 |
| McCandless, Charles | 25 | Beaver, Butler | Rep | 88 | 1864 |
| McCandless, Charles | 27 | Armstrong, Butler, Lawrence | Rep | 89 | 1865 |
| McCandless, William | 1 | Philadelphia (Part) | Dem | 91 | 1867 |
| McCandless, William | 1 | Philadelphia (Part) | Dem | 92 | 1868 |
| McCandless, William | 1 | Philadelphia (Part) | Dem | 93 | 1869 |
| McCarrell, Samuel J. M. | 15 | Dauphin | Rep | 110 | 1893-94 |
| McCarrell, Samuel J. M. | 15 | Dauphin | Rep | 111 | 1895-96 |
| McCarrell, Samuel J. M. | 15 | Dauphin | Rep | 112 | 1897-98 |
| McCarrell, Samuel J. M. | 15 | Dauphin | Rep | 113 | 1899-00 |
| McCaslin, Maxwell | 22 | Fayette, Greene | Dem | 73 | 1849 |
| McCaslin, Maxwell | 22 | Fayette, Greene | Dem | 74 | 1850 |
| McCaslin, Maxwell | 22 | Fayette, Greene | Dem | 75 | 1851 |
| McCaslin, Maxwell | 23 | Washington, Greene | Dem | 76 | 1852 |
| McCaslin, Maxwell | 23 | Washington, Greene | Dem | 77 | 1853 |
| McCaslin, Maxwell | 23 | Washington, Greene | Dem | 78 | 1854 |
| McClanahan, James X. | 14 | Franklin, Cumberland, Adams | Dem | 66 | 1842 |
| McClanahan, James X. | 14 | Franklin, Cumberland, Adams | Dem | 67 | 1843 |
| McClanahan, James X. | 18 | Franklin, Adams | Dem | 68 | 1844 |
| McClellan, Joseph | | Bucks, Chester, Montgomery | Fed | 22 | 1797-98 |
| McClellan, Joseph | | Bucks, Chester, Montgomery | Fed | 23 | 1798-99 |
| McClellan, Joseph | | Bucks, Chester, Montgomery | Fed | 24 | 1799-1800 |
| McClellan, Joseph | | Bucks, Chester, Montgomery | Fed | 25 | 1800-01 |
| McClellan, Robert L. | 19 | Chester | Rep | 99 | 1875 |
| McClellan, Robert L. | 19 | Chester | Rep | 100 | 1876 |
| McClintock, Jonas R. | 22 | Allegheny | Dem | 78 | 1854 |
| McClintock, Jonas R. | 22 | Allegheny | Dem | 79 | 1855 |
| McClintock, Jonas R. | 22 | Allegheny | Dem | 80 | 1856 |
| McClintock, Wilson S. | 43 | Allegheny (Part) | Rep | 124 | 1921-22 |
| McClintock, Wilson S. | 43 | Allegheny (Part) | Rep | 125 | 1923-24 |
| McClure, Alexander | 4 | Philadelphia (Part) | Lib Rep | 97 | 1873 |
| McClure, Alexander | 4 | Philadelphia (Part) | Lib Rep | 98 | 1874 |
| McClure, Alexander K. | 18 | Adams, Franklin, Fulton | Rep | 84 | 1860 |
| McClure, Alexander K. | 18 | Adams, Franklin, Fulton | Rep | 85 | 1861 |
| McClure, Alexander K. | 18 | Adams, Franklin, Fulton | Rep | 86 | 1862 |
| McClure, Francis | | Allegheny, Beaver, Butler | Dem | 34 | 1809-10 |
| McClure, Francis | | Allegheny, Beaver, Butler | Dem | 35 | 1810-11 |
| McClure, Francis | | Allegheny, Beaver, Butler | Dem | 36 | 1811-12 |
| McClure, John J. | 9 | Delaware | Rep | 128 | 1929-30 |
| McClure, John J. | 9 | Delaware | Rep | 129 | 1931-32 |
| McClure, John J. | 9 | Delaware | Rep | 130 | 1933-34 |
| McClure, John J. | 9 | Delaware | Rep | 131 | 1935-36 |
| McClure, Robert | 13 | Lycoming, Centre, Clearfield, McKean, Potter | Fed | 52 | 1827-28 |
| McClure, Robert | 13 | Lycoming, Centre, Clearfield, McKean, Potter | Dem | 53 | 1828-29 |
| McClure, Robert | 13 | Lycoming, Centre, Clearfield, McKean, Potter | Dem | 54 | 1829-30 |
| McClure, Samuel | 47 | Lawrence, Mercer | Rep | 106 | 1885-86 |
| McClure, Samuel | 47 | Lawrence, Mercer | Rep | 107 | 1887-88 |
| McConaughy, David | 19 | Adams, Franklin | Rep | 91 | 1867 |
| McConaughy, David | 19 | Adams, Franklin | Rep | 92 | 1868 |
| McConkey, Edwin K. | 28 | York | Rep | 115 | 1903-04 |
| McConkey, Edwin K. | 28 | York | Rep | 116 | 1905-06 |
| McConkey, James | 14 | York, Adams | AM | 60 | 1835-36 |
| McConkey, James | 14 | York, Adams | AM | 61 | 1836-37 |
| McConkey, James | 6 | Lancaster, York | Whig | 62 | 1837-38 |
| McConkey, James | 6 | Lancaster, York | Whig | 63 | 1838-39 |
| McConnell, William C. | 27 | Snyder, Northumberland, Union | Rep | 118 | 1909-10 |
| McConnell, William C. | 27 | Snyder, Northumberland, Union | Rep | 119 | 1911-12 |
| McConnell, William C. | 27 | Snyder, Northumberland, Union | Rep | 122 | 1917-18 |
| McConnell, William C. | 27 | Snyder, Northumberland, Union | Rep | 123 | 1919-20 |
| McConnell, William C. | 27 | Snyder, Northumberland, Union | Rep | 124 | 1921-22 |
| McConnell, William C. | 27 | Snyder, Northumberland, Union | Rep | 121 | 1915-16 |
| McCormack, Thomas J. | 36 | Philadelphia (Part) | Dem | 161-2 | 1977-78 |
| McCracken, George W. | 47 | Lawrence, Mercer | Rep | 104 | 1881-82 |
| McCracken, George W. | 47 | Lawrence, Mercer | Rep | 105 | 1883-84 |
| McCreary, David B. | 49 | Erie | Rep | 108 | 1889-90 |
| McCreary, David B. | 49 | Erie | Rep | 109 | 1891-92 |
| McCreary, David B. | 49 | Erie | Rep | 110 | 1893-94 |
| McCreary, David B. | 49 | Erie | Rep | 111 | 1895-96 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 131 | 1935-36 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 132 | 1937-38 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 133 | 1939-40 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 134 | 1941-42 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 135 | 1943-44 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 136 | 1945-46 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 139 | 1951-52 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 140 | 1953-54 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 141 | 1955-56 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 142 | 1957-58 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 143-4 | 1959-60 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 145-6 | 1961-62 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 147-8 | 1963-64 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 149-50 | 1965-66 |
| McCreesh, John J. | 4 | Philadelphia (Part) | Dem | 151-2 | 1967-68 |
| McCreesh, John J. | 8 | Philadelphia (Part) | Dem | 153-4 | 1969-70 |
| McCreesh, John J. | 8 | Philadelphia (Part) | Dem | 155-6 | 1971-72 |
| McCreesh, John J. | 8 | Philadelphia (Part) | Dem | 157-8 | 1973-74 |
| McCrossin, Lawrence E. | 1 | Philadelphia (Part) | Dem | 128 | 1929-30 |
| McCulloch, George | 17 | Mifflin, Huntingdon, Cambria | Dem | 57 | 1832-33 |
| McCulloch, George | 17 | Mifflin, Huntingdon, Cambria | Dem | 58 | 1833-34 |
| McCulloch, George | 17 | Mifflin, Huntingdon, Cambria | Dem | 59 | 1834-35 |
| McCulloch, George | 17 | Mifflin, Huntingdon, Cambria | Dem | 60 | 1835-36 |
| McCully, Thomas | 2 | Philadelphia | Dem | 66 | 1842 |
| McCully, Thomas | 2 | Philadelphia | Dem | 67 | 1843 |
| McCusker, Francis P. | 8 | Philadelphia (Part) | Rep | 140 | 1953-54 |
| McDonald, M. E. | 20 | Lackawanna, Luzerne (Part) | Dem | 109 | 1891-92 |
| McDonald, M. E. | 20 | Lackawanna, Luzerne (Part) | Dem | 110 | 1893-94 |
| McFarland, Abel | | Washington, Greene | Dem | 35 | 1810-11 |
| McFarland, Abel | | Washington, Greene | Dem | 36 | 1811-12 |
| McFarland, Abel | | Washington, Greene | Dem | 37 | 1812-13 |
| McFarland, Abel | | Washington, Greene | Dem | 38 | 1813-14 |
| McFarland, Abel | | Washington, Greene | Dem | 39 | 1814-15 |
| McFarland, Abel | 18 | Washington, Greene | Dem | 40 | 1815-16 |
| McFarland, Abel | 18 | Washington, Greene | Dem | 41 | 1816-17 |
| McFarland, Abel | 18 | Washington, Greene | Dem | 42 | 1817-18 |
| McFarland, John | 27 | Westmoreland, Fayette | Dem | 76 | 1852 |
| McFarland, John | 27 | Westmoreland, Fayette | Dem | 77 | 1853 |
| McFarland, John | 27 | Westmoreland, Fayette | Dem | 78 | 1854 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 131 | 1935-36 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 132 | 1937-38 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 133 | 1939-40 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 134 | 1941-42 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 135 | 1943-44 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 136 | 1945-46 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 139 | 1951-52 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 140 | 1953-54 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 141 | 1955-56 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 142 | 1957-58 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 143-4 | 1959-60 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 145-6 | 1961-62 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 147-8 | 1963-64 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 149-50 | 1965-66 |
| McGinnis, Bernard B. | 42 | Allegheny (Part) | Dem | 151-2 | 1967-68 |
| McGlinchey, Herbert J. | 5 | Philadelphia (Part) | Dem | 149-50 | 1965-66 |
| McGlinchey, Herbert J. | 5 | Philadelphia (Part) | Dem | 151-2 | 1967-68 |
| McGlinchey, Herbert J. | 5 | Philadelphia (Part) | Dem | 153-4 | 1969-70 |
| McGlinchey, Herbert J. | 5 | Philadelphia (Part) | Dem | 155-6 | 1971-72 |
| McGregor, Jack E. | 44 | Allegheny (Part) | Rep | 147-8 | 1963-64 |
| McGregor, Jack E. | 44 | Allegheny (Part) | Rep | 149-50 | 1965-66 |
| McGregor, Jack E. | 44 | Allegheny (Part) | Rep | 151-2 | 1967-68 |
| McGregor, Jack E. | 44 | Allegheny (Part) | Rep | 153-4 | 1969-70 |
| McHenry, Elias J. | 24 | Columbia, Montour, Lycoming, Sullivan | Dem | 104 | 1881-82 |
| McIlhenny, Francis S. | 6 | Philadelphia (Part) | Rep | 117 | 1907-08 |
| McIlhenny, Francis S. | 6 | Philadelphia (Part) | Rep | 118 | 1909-10 |
| McIlhenny, Francis S. | 6 | Philadelphia (Part) | Rep | 119 | 1911-12 |
| McIlhenny, Francis S. | 6 | Philadelphia (Part) | Rep (Fusion) | 120 | 1913-14 |
| McIlvane, William | 14 | York, Adams | Dem | 48 | 1823-24 |
| McIlvane, William | 14 | York, Adams | Dem | 49 | 1824-25 |
| McIlvane, William | 14 | York, Adams | Dem | 50 | 1825-26 |
| McIntyre, Charles J. T. | 21 | Blair, Centre, Huntingdon, Juniata, Mifflin, Perry | Dem | 92 | 1868 |
| McIntyre, Charles J. T. | 21 | Blair, Centre, Huntingdon, Juniata, Mifflin, Perry | Dem | 93 | 1869 |
| McIntyre, Charles J. T. | 21 | Blair, Centre, Huntingdon, Juniata, Mifflin, Perry | Dem | 94 | 1870 |
| McKean, Samuel | 11 | Bradford, Susquehanna, Tioga | Dem | 54 | 1829-30 |
| McKee, James W. | 31 | Juniata, Mifflin, Perry | Rep | 114 | 1901-02 |
| McKee, James W. | 31 | Juniata, Mifflin, Perry | Rep | 115 | 1903-04 |
| McKee, William S. | 44 | Allegheny (Part) | Rep | 121 | 1915-16 |
| McKee, William S. | 44 | Allegheny (Part) | Rep | 122 | 1917-18 |
| McKibben, Chambers | 33 | Franklin, Huntingdon | Dem | 99 | 1875 |
| McKibben, Chambers | 33 | Franklin, Huntingdon | Dem | 100 | 1876 |
| McKinley, Samuel | 28 | Lawrence, Mercer, Venango | Rep | 97 | 1873 |
| McKinley, Samuel | 28 | Lawrence, Mercer, Venango | Rep | 98 | 1874 |
| McKinley, Samuel | 47 | Lawrence, Mercer | Rep | 99 | 1875 |
| McKinney, Paul | 8 | Philadelphia (Part) | Dem | 159-60 | 1975-76 |
| McKinney, Paul | 8 | Philadelphia (Part) | Dem | 161-2 | 1977-78 |
| McKinney, Paul | 8 | Philadelphia (Part) | Dem | 163-4 | 1979-80 |
| McKinney, Paul | 8 | Philadelphia (Part) | Dem | 165-6 | 1981-82 |
| McKnight, William J. | 37 | Indiana, Jefferson | Rep | 104 | 1881-82 |
| McKnight, William J. | 37 | Indiana, Jefferson | Rep | 105 | 1883-84 |
| McLain, J. R. | 46 | Beaver, Washington | Rep | 107 | 1887-88 |
| McLain, J. R. | 46 | Beaver, Washington | Rep | 108 | 1889-90 |
| McLaughlin, William J., III | 6 | Philadelphia (Part) | Dem | 149-50 | 1965-66 |
| McMeens, John | 10 | Lycoming, Centre, Clearfield, McKean, Tioga, Potter, Bradford | Dem | 44 | 1819-20 |
| McMeens, John | 10 | Lycoming, Centre, Clearfield, McKean, Tioga, Potter, Bradford | Dem | 45 | 1820-21 |
| McMeens, John | 10 | Lycoming, Centre, Clearfield, McKean, Tioga, Potter, Bradford | Dem | 46 | 1821-22 |
| McMeens, John | 13 | Lycoming, Centre, Clearfield, McKean, Potter | Dem | 47 | 1822-23 |
| McMenamin, Hugh J. | 22 | Lackawanna | Dem | 139 | 1951-52 |
| McMenamin, Hugh J. | 22 | Lackawanna | Dem | 140 | 1953-54 |
| McMenamin, Hugh J. | 22 | Lackawanna | Dem | 141 | 1955-56 |
| McMenamin, Hugh J. | 22 | Lackawanna | Dem | 142 | 1957-58 |
| McMenamin, Hugh J. | 22 | Lackawanna | Dem | 143-4 | 1959-60 |
| McMenamin, Hugh J. | 22 | Lackawanna | Dem | 145-6 | 1961-62 |
| McMullen, W. S. | 48 | Warren, Venango | Rep | 99 | 1875 |
| McMullen, W. S. | 48 | Warren, Venango | Rep | 100 | 1876 |
| McMullin, Robert | 1 | Philadelphia City, Philadelphia | Old Sch | 44 | 1819-20 |
| McMullin, Robert | 1 | Philadelphia City, Philadelphia | Fed | 45 | 1820-21 |
| McMurtrie, Robert | 15 | Blair, Cambria, Huntingdon | Whig | 75 | 1851 |
| McMurtrie, Robert | 15 | Blair, Cambria, Huntingdon | Whig | 76 | 1852 |
| McMurtrie, Robert | 15 | Blair, Cambria, Huntingdon | Whig | 77 | 1853 |
| McNees, George W. | 41 | Armstrong, Butler | Rep | 116 | 1905-06 |
| McNees, George W. | 41 | Armstrong, Butler | Rep | 117 | 1907-08 |
| McNeill, Hugh | 42 | Allegheny (Part) | Rep | 99 | 1875 |
| McNeill, Hugh | 42 | Allegheny (Part) | Rep | 100 | 1876 |
| McNeill, Hugh | 42 | Allegheny (Part) | Rep | 101 | 1877 |
| McNeill, Hugh | 42 | Allegheny (Part) | Rep | 102 | 1878 |
| McNeill, Hugh | 42 | Allegheny (Part) | Rep | 103 | 1879-80 |
| McNeill, Hugh | 42 | Allegheny (Part) | Rep | 104 | 1881-82 |
| McNeill, Hugh | 42 | Allegheny (Part) | Rep | 105 | 1883-84 |
| McNeill, Hugh | 42 | Allegheny (Part) | Rep | 106 | 1885-86 |
| McNichol, James P. | 7 | Philadelphia (Part) | Rep | 116 | 1905-06 |
| McNichol, James P. | 3 | Philadelphia (Part) | Rep | 117 | 1907-08 |
| McNichol, James P. | 3 | Philadelphia (Part) | Rep | 118 | 1909-10 |
| McNichol, James P. | 3 | Philadelphia (Part) | Rep | 119 | 1911-12 |
| McNichol, James P. | 3 | Philadelphia (Part) | Rep | 120 | 1913-14 |
| McNichol, James P. | 3 | Philadelphia (Part) | Rep | 121 | 1915-16 |
| McNichol, James P. | 3 | Philadelphia (Part) | Rep | 122 | 1917-18 |
| McNichol, William J. | 3 | Philadelphia (Part) | Rep | 124 | 1921-22 |
| McNichol, William J. | 3 | Philadelphia (Part) | Rep | 125 | 1923-24 |
| McNichol, William J. | 3 | Philadelphia (Part) | Rep | 126 | 1925-26 |
| McNichol, William J. | 3 | Philadelphia (Part) | Rep | 123 | 1919-20 |
| McNichols, Walter | 22 | Lackawanna | Rep | 119 | 1911-12 |
| McNichols, Walter | 22 | Lackawanna | Rep | 120 | 1913-14 |
| McPherson, Donald P. | 32 | Cumberland, Adams | Rep | 115 | 1903-04 |
| McPherson, Donald P. | 32 | Cumberland, Adams | Rep | 116 | 1905-06 |
| McPherson, Donald P., Jr. | 33 | Franklin, Adams | Rep | 138 | 1949-50 |
| McPherson, Donald P., Jr. | 33 | Franklin, Adams | Rep | 139 | 1951-52 |
| McPherson, Donald P., Jr. | 33 | Franklin, Adams | Rep | 140 | 1953-54 |
| McPherson, Donald P., Jr. | 33 | Franklin, Adams | Rep | 141 | 1955-56 |
| McQuiddy, J. K | 47 | Lawrence, Beaver | Dem | 134 | 1941-42 |
| McQuiddy, J. K | 47 | Lawrence, Beaver | Dem | 135 | 1943-44 |
| McQuown, M. L. | 34 | Clinton, Clearfield, Centre | Rep | 111 | 1895-96 |
| McQuown, M. L. | 34 | Clinton, Clearfield, Centre | Rep | 112 | 1897-98 |
| McSherry, James | | York, Adams | Fed | 38 | 1813-14 |
| McSherry, James | | York, Adams | Fed | 39 | 1814-15 |
| McSherry, James | 11 | York, Adams | Fed | 40 | 1815-16 |
| McSherry, James | 11 | York, Adams | Fed | 41 | 1816-17 |
| McSherry, William | 18 | Adams, Franklin, Fulton | Dem | 87 | 1863 |
| McSherry, William | 18 | Adams, Franklin, Fulton | Dem | 88 | 1864 |
| McSherry, William | 19 | Adams, Franklin | Dem | 89 | 1865 |
| McSherry, William | 20 | Adams, York | Dem | 96 | 1872 |
| McSherry, William | 20 | Adams, York | Dem | 97 | 1873 |
| McSherry, William | 20 | Adams, York | Dem | 98 | 1874 |
| Meade, John R. | 3 | Philadelphia (Part) | Rep | 138 | 1949-50 |
| Meade, John R. | 3 | Philadelphia (Part) | Rep | 139 | 1951-52 |
| Mearkle, William W. | 43 | Allegheny (Part) | Rep | 123 | 1919-20 |
| Mechling, Philip | 24 | Venango, Warren, Armstrong, Indiana, Jefferson | Dem | 55 | 1830-31 |
| Mechling, Philip | 24 | Venango, Warren, Armstrong, Indiana, Jefferson | AM | 56 | 1831-32 |
| Mechling, Philip | 24 | Venango, Warren, Armstrong, Indiana, Jefferson | AM | 57 | 1832-33 |
| Mechling, Philip | 24 | Venango, Warren, Armstrong, Indiana, Jefferson | AM | 58 | 1833-34 |
| Meek, P. Gray | 34 | Clinton, Clearfield, Centre | Dem | 109 | 1891-92 |
| Meek, P. Gray | 34 | Clinton, Clearfield, Centre | Dem | 110 | 1893-94 |
| Mehard, Thomas M. | 47 | Lawrence, Mercer | Rep | 108 | 1889-90 |
| Mehard, Thomas M. | 47 | Lawrence, Mercer | Rep | 109 | 1891-92 |
| Meily, George F. | 17 | Lebanon | Rep | 101 | 1877 |
| Meily, George F. | 17 | Lebanon | Rep | 102 | 1878 |
| Meily, George F. | 17 | Lebanon | Rep | 103 | 1879-80 |
| Mellinger, David | 11 | Adams, Franklin | Whig | 78 | 1854 |
| Mellinger, David | 11 | Adams, Franklin | Whig | 79 | 1855 |
| Mellinger, David | 11 | Adams, Franklin | Whig | 80 | 1856 |
| Mellow, Robert J. | 22 | Lackawanna | Dem | 155-6 | 1971-72 |
| Mellow, Robert J. | 22 | Lackawanna | Dem | 157-8 | 1973-74 |
| Mellow, Robert J. | 22 | Lackawanna | Dem | 159-60 | 1975-76 |
| Mellow, Robert J. | 22 | Lackawanna | Dem | 161-2 | 1977-78 |
| Mellow, Robert J. | 22 | Lackawanna | Dem | 163-4 | 1979-80 |
| Mellow, Robert J. | 22 | Lackawanna | Dem | 165-6 | 1981-82 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part) | Dem | 167-8 | 1983-84 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part) | Dem | 169-70 | 1985-86 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part) | Dem | 171-2 | 1987-88 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part) | Dem | 173-4 | 1989-90 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part) | Dem | 175-6 | 1991-92 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part), Luzerne (Part) | Dem | 177-8 | 1993-94 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part), Luzerne (Part) | Dem | 179-80 | 1995-96 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part), Luzerne (Part) | Dem | 181-2 | 1997-98 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part), Luzerne (Part) | Dem | 183-4 | 1999-00 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part), Luzerne (Part) | Dem | 185-6 | 2001-02 |
| Mellow, Robert J. | 22 | Lackawanna, Monroe (Part), Luzerne (Part) | Dem | 187-8 | 2003-04 |
| Meredith, Jonathan E. | 21 | Armstrong, Indiana | Rep | 84 | 1860 |
| Meredith, Jonathan E. | 21 | Armstrong, Indiana | Rep | 85 | 1861 |
| Meredith, Jonathan E. | 21 | Armstrong, Indiana | Rep | 86 | 1862 |
| Meredith, William B. | 41 | Armstrong, Butler | Rep | 106 | 1885-86 |
| Meredith, William B. | 41 | Armstrong, Butler | Rep | 107 | 1887-88 |
| Meredith, William B. | 41 | Armstrong, Butler | Rep | 110 | 1893-94 |
| Meredith, William B. | 41 | Armstrong, Butler | Rep | 111 | 1895-96 |
| Meredith, William B. | 41 | Armstrong, Butler | Rep | 112 | 1897-98 |
| Meredith, William B. | 41 | Armstrong, Butler | Rep | 113 | 1899-00 |
| Merrick, Walter T. | 25 | McKean, Potter, Tioga | Rep | 112 | 1897-98 |
| Merrick, Walter T. | 25 | McKean, Potter, Tioga | Rep | 113 | 1899-00 |
| Messinger, Henry C. | 16 | Lehigh | Dem | 155-6 | 1971-72 |
| Messinger, Henry C. | 16 | Lehigh (Part) | Dem | 157-8 | 1973-74 |
| Messinger, Henry C. | 16 | Lehigh (Part) | Dem | 159-60 | 1975-76 |
| Messinger, Henry C. | 16 | Lehigh (Part) | Dem | 161-2 | 1977-78 |
| Messinger, Henry C. | 16 | Lehigh (Part) | Dem | 163-4 | 1979-80 |
| Messinger, Henry C. | 16 | Lehigh (Part) | Dem | 165-6 | 1981-82 |
| Metzger, V. H. | 24 | Columbia, Montour, Lycoming, Sullivan | Dem | 107 | 1887-88 |
| Metzger, V. H. | 24 | Columbia, Montour, Lycoming, Sullivan | Dem | 108 | 1889-90 |
| Mewhorter, Thomas | | Northampton | Rep | 24 | 1799-1800 |
| Mewhorter, Thomas | | Northampton | Rep | 25 | 1800-01 |
| Mewhorter, Thomas | | Northampton, Wayne, Luzerne | Rep | 26 | 1801-02 |
| Mewhorter, Thomas | | Northampton, Wayne, Luzerne | Rep | 27 | 1802-03 |
| Mewhorter, Thomas | | Northampton, Wayne, Luzerne | Rep | 28 | 1803-04 |
| Mewhorter, Thomas | | Northampton, Wayne, Luzerne | Rep | 29 | 1804-05 |
| Mewhorter, Thomas | | Northampton, Wayne, Luzerne | Quid | 30 | 1805-06 |
| Mewhorter, Thomas | | Northampton, Wayne, Luzerne | Quid | 31 | 1806-07 |
| Michler, Peter S. | 12 | Northampton, Wayne, Lehigh, Pike | AM | 60 | 1835-36 |
| Michler, Peter S. | 12 | Northampton, Wayne, Lehigh, Pike | AM | 61 | 1836-37 |
| Michler, Peter S. | 10 | Lehigh, Northampton | Whig | 62 | 1837-38 |
| Michler, Peter S. | 10 | Lehigh, Northampton | Whig | 63 | 1838-39 |
| Middlecoff, David | 14 | York, Adams | Dem | 58 | 1833-34 |
| Middlecoff, David | 14 | York, Adams | Dem | 59 | 1834-35 |
| Middlecoff, David | 14 | York, Adams | Dem | 60 | 1835-36 |
| Middlecoff, David | 14 | York, Adams | Whig | 61 | 1836-37 |
| Middleswarth, Ner | 15 | Mifflin, Juniata, Union | Whig | 72 | 1848 |
| Milleisen, Alfred W. | 32 | Cumberland, Adams | Rep | 111 | 1895-96 |
| Milleisen, Alfred W. | 32 | Cumberland, Adams | Rep | 112 | 1897-98 |
| Miller, Abraham | 1 | Philadelphia City | Dem | 60 | 1835-36 |
| Miller, Abraham | 1 | Philadelphia City | Dem | 61 | 1836-37 |
| Miller, Abraham | 1 | Philadelphia City | Whig | 62 | 1837-38 |
| Miller, Abraham | 1 | Philadelphia City | Whig | 63 | 1838-39 |
| Miller, Andrew G. | 18 | Cumberland, York | Dem | 93 | 1869 |
| Miller, Andrew G. | 18 | Cumberland, York | Dem | 94 | 1870 |
| Miller, Andrew G. | 18 | Cumberland, York | Dem | 95 | 1871 |
| Miller, B. Frank | 18 | Northampton | Dem | 117 | 1907-08 |
| Miller, B. Frank | 18 | Northampton | Dem | 118 | 1909-10 |
| Miller, Charles E. | 27 | Snyder, Northumberland, Union | Dem | 130 | 1933-34 |
| Miller, Charles E. | 27 | Snyder, Northumberland, Union | Dem | 131 | 1935-36 |
| Miller, Frank P. | 50 | Crawford, Mercer | Rep | 125 | 1923-24 |
| Miller, Frank P. | 50 | Crawford, Mercer | Rep | 126 | 1925-26 |
| Miller, George W. | 23 | Washington, Greene | Dem | 82 | 1858 |
| Miller, George W. | 23 | Washington, Greene | Dem | 83 | 1859 |
| Miller, George W. | 23 | Greene, Washington | Dem | 84 | 1860 |
| Miller, James A. | 16 | Lehigh | Dem | 119 | 1911-12 |
| Miller, James A. | 16 | Lehigh | Dem | 120 | 1913-14 |
| Miller, Jesse | 16 | Cumberland, Perry | Dem | 52 | 1827-28 |
| Miller, Jesse | 16 | Cumberland, Perry | Dem | 53 | 1828-29 |
| Miller, Jesse | 16 | Cumberland, Perry | Dem | 54 | 1829-30 |
| Miller, Jesse | 16 | Cumberland, Perry | Dem | 55 | 1830-31 |
| Miller, Jesse | 16 | Cumberland, Perry | Dem | 56 | 1831-32 |
| Miller, Jesse | 16 | Cumberland, Perry | Dem | 57 | 1832-33 |
| Miller, John | | Lancaster | Fed | 19 | 1794-95 |
| Miller, John | | Lancaster | Fed | 20 | 1795-96 |
| Miller, John | | Lancaster | Fed | 21 | 1796-97 |
| Miller, John | | Lancaster | Fed | 22 | 1797-98 |
| Miller, John | 5 | Berks | Dem | 61 | 1836-37 |
| Miller, John | 5 | Berks | Dem | 62 | 1837-38 |
| Miller, John | 5 | Berks | Dem | 63 | 1838-39 |
| Miller, John | 5 | Berks | Dem | 64 | 1839-40 |
| Miller, John Carl | 47 | Lawrence, Beaver | Dem | 140 | 1953-54 |
| Miller, John Carl | 47 | Lawrence, Beaver | Dem | 141 | 1955-56 |
| Miller, John Carl | 47 | Lawrence, Beaver | Dem | 142 | 1957-58 |
| Miller, John Carl | 47 | Lawrence, Beaver | Dem | 143-4 | 1959-60 |
| Miller, John Carl | 47 | Lawrence, Beaver | Dem | 145-6 | 1961-62 |
| Miller, John Carl | 47 | Lawrence, Beaver | Dem | 147-8 | 1963-64 |
| Miller, John S. | 36 | Bedford, Fulton, Somerset | Rep | 123 | 1919-20 |
| Miller, John S. | 36 | Bedford, Fulton, Somerset | Rep | 124 | 1921-22 |
| Miller, Robert M. | 20 | Luzerne (Part) | Rep | 133 | 1939-40 |
| Miller, Robert M. | 20 | Luzerne (Part) | Rep | 134 | 1941-42 |
| Miller, Summerfield J. | 34 | Clearfield, Centre | Rep | 121 | 1915-16 |
| Miller, Summerfield J. | 34 | Clearfield, Centre | Rep | 122 | 1917-18 |
| Miller, Summerfield J. | 34 | Clearfield, Centre | Rep | 123 | 1919-20 |
| Miller, Summerfield J. | 34 | Clearfield, Centre | Rep | 124 | 1921-22 |
| Miller, Thomas C. | 14 | Franklin, Cumberland, Adams | Dem | 63 | 1838-39 |
| Miller, Thomas C. | 14 | Franklin, Cumberland, Adams | Dem | 64 | 1839-40 |
| Miller, Thomas C. | 14 | Franklin, Cumberland, Adams | Dem | 65 | 1841 |
| Miller, W. Oscar | 11 | Berks | Dem | 112 | 1897-98 |
| Miller, W. Oscar | 11 | Berks | Dem | 113 | 1899-00 |
| Miller, William | | York, Adams | Quid | 30 | 1805-06 |
| Miller, William | | York, Adams | Quid | 31 | 1806-07 |
| Miller, William | | York, Adams | Quid | 32 | 1807-08 |
| Miller, William | | York, Adams | Quid | 33 | 1808-09 |
| Miller, William C. | 36 | Bedford, Fulton, Somerset | Rep | 115 | 1903-04 |
| Miller, William C. | 36 | Bedford, Fulton, Somerset | Rep | 116 | 1905-06 |
| Miller, William C. | 36 | Bedford, Fulton, Somerset | Rep | 117 | 1907-08 |
| Miller, William C. | 36 | Bedford, Fulton, Somerset | Rep | 118 | 1909-10 |
| Miller, William E. | 32 | Cumberland, Adams | Dem | 113 | 1899-00 |
| Miller, William E. | 32 | Cumberland, Adams | Dem | 114 | 1901-02 |
| Mills, Charles E. | 23 | Bradford, Wyoming, Susquehanna | Rep | 120 | 1913-14 |
| Mills, Charles E. | 23 | Bradford, Wyoming, Susquehanna | Rep | 121 | 1915-16 |
| Mitchell, B. B. | 23 | Bradford, Wyoming | Rep | 110 | 1893-94 |
| Mitchell, B. B. | 23 | Bradford, Wyoming | Rep | 111 | 1895-96 |
| Mitchell, B. B. | 23 | Bradford, Wyoming | Rep | 112 | 1897-98 |
| Mitchell, B. B. | 23 | Bradford, Wyoming | Rep | 113 | 1899-00 |
| Mitchell, David | | Cumberland | Quid | 30 | 1805-06 |
| Mitchell, David | | Cumberland | Rep | 31 | 1806-07 |
| Mitchell, David | | Cumberland | Rep | 32 | 1807-08 |
| Mitchell, David | | Cumberland | Rep | 33 | 1808-09 |
| Mitchell, James G. | 37 | Indiana, Jefferson | Rep | 110 | 1893-94 |
| Mitchell, James G. | 37 | Indiana, Jefferson | Rep | 111 | 1895-96 |
| Mitchell, James G. | 37 | Indiana, Jefferson | Rep | 112 | 1897-98 |
| Mitchell, James G. | 37 | Indiana, Jefferson | Rep | 113 | 1899-00 |
| Monaghan, B. J. | 30 | Schuylkill (Part) | Dem | 109 | 1891-92 |
| Monaghan, B. J. | 30 | Schuylkill (Part) | Dem | 110 | 1893-94 |
| Montgomery, Daniel | | Northumberland | Rep | 29 | 1804-05 |
| Montgomery, Daniel | | Northumberland | Rep | 30 | 1805-06 |
| Montgomery, David B. | 13 | Montour, Northumberland, Snyder | Dem | 88 | 1864 |
| Montgomery, David B. | 15 | Columbia, Montour, Northumberland, Sullivan | Dem | 89 | 1865 |
| Montgomery, David B. | 15 | Columbia, Montour, Northumberland, Sullivan | Dem | 90 | 1866 |
| Montgomery, William | | Northumberland, Luzerne, Huntingdon | Rep | 15 | 1790-91 |
| Montgomery, William | | Northumberland, Luzerne, Huntingdon | Rep | 16 | 1791-92 |
| Montgomery, William | | Northumberland, Luzerne, Huntingdon | Rep | 17 | 1792-93 |
| Montgomery, William | | Northumberland, Luzerne, Huntingdon | Rep | 18 | 1793-94 |
| Moore, John | | Westmoreland, Allegheny | Rep | 15 | 1790-91 |
| Moore, John | | Westmoreland, Allegheny | Rep | 16 | 1791-92 |
| Moore, John | | Westmoreland, Allegheny | Rep | 17 | 1792-93 |
| Moore, John | | Westmoreland, Allegheny | Rep | 18 | 1793-94 |
| Moore, John | | Westmoreland, Fayette | Rep | 19 | 1794-95 |
| Moore, John P. | 45 | Allegheny (Part) | Rep | 120 | 1913-14 |
| Moore, John P. | 45 | Allegheny (Part) | Rep | 121 | 1915-16 |
| Moore, Robert | 10 | Luzerne, Columbia | Dem | 49 | 1824-25 |
| Moore, Robert | 10 | Luzerne, Columbia | Dem | 50 | 1825-26 |
| Moore, Robert | 10 | Luzerne, Columbia | Dem | 51 | 1826-27 |
| Moore, Robert | 10 | Luzerne, Columbia | Dem | 52 | 1827-28 |
| Moore, William J. | 33 | Adams, Franklin, Fulton, Perry, Cumberland (Pt.), Juniata (Pt.) | Rep | 157-8 | 1973-74 |
| Moore, William J. | 33 | Adams, Franklin, Fulton, Perry, Cumberland (Pt.), Juniata (Pt.) | Rep | 159-60 | 1975-76 |
| Moore, William J. | 33 | Adams, Franklin, Fulton, Perry, Cumberland (Pt.), Juniata (Pt.) | Rep | 161-2 | 1977-78 |
| Moore, William J. | 33 | Adams, Franklin, Fulton, Perry, Cumberland (Pt.), Juniata (Pt.) | Rep | 163-4 | 1979-80 |
| Moore, William J. | 33 | Adams, Franklin, Fulton, Perry, Cumberland (Pt.), Juniata (Pt.) | Rep | 165-6 | 1981-82 |
| Moore, William J. | 33 | Adams, Franklin, Perry, Cumberland (Part), Juniata (Part) | Rep | 167-8 | 1983-84 |
| Moore, William J. | 33 | Adams, Franklin, Perry, Cumberland (Part), Juniata (Part) | Rep | 169-70 | 1985-86 |
| Moore, William J. | 33 | Adams, Franklin, Perry, Cumberland (Part), Juniata (Part) | Rep | 171-2 | 1987-88 |
| Morgan, Benjamin | | Philadelphia City, Philadelphia, Delaware | Fed | 21 | 1796-97 |
| Morgan, Benjamin | | Philadelphia City, Philadelphia, Delaware | Fed | 22 | 1797-98 |
| Morgan, Benjamin | | Philadelphia City, Philadelphia, Delaware | Fed | 23 | 1798-99 |
| Morgan, Benjamin R. | 1 | Philadelphia City, Philadelphia | Fed | 40 | 1815-16 |
| Morgan, Benjamin R. | 1 | Philadelphia City, Philadelphia | Fed | 41 | 1816-17 |
| Morgan, Benjamin R. | 1 | Philadelphia City, Philadelphia | Fed | 42 | 1817-18 |
| Morgan, Benjamin R. | 1 | Philadelphia City, Philadelphia | Fed | 43 | 1818-19 |
| Morgan, J. Harry | 18 | Northampton | Dem | 119 | 1911-12 |
| Morgan, J. Harry | 18 | Northampton | Dem | 120 | 1913-14 |
| Morris, Anthony | | Philadelphia City, Philadelphia, Delaware | Fed | 16 | 1791-92 |
| Morris, Anthony | | Philadelphia City, Philadelphia, Delaware | Fed | 17 | 1792-93 |
| Morris, Anthony | | Philadelphia City, Philadelphia, Delaware | Fed | 18 | 1793-94 |
| Morris, Mathias | 5 | Bucks | NR | 53 | 1828-29 |
| Morris, Mathias | 5 | Bucks | NR | 54 | 1829-30 |
| Morris, Mathias | 5 | Bucks | NR | 55 | 1830-31 |
| Morris, Mathias | 5 | Bucks | NR | 56 | 1831-32 |
| Morris, Walter E. | 37 | Indiana, Jefferson | Rep | 145-6 | 1961-62 |
| Morris, Walter E. | 37 | Indiana, Jefferson | Rep | 147-8 | 1963-64 |
| Morrison, John | 19 | Bedford, Huntingdon | Whig | 69 | 1845 |
| Morrison, John | 19 | Huntingdon, Bedford | Whig | 70 | 1846 |
| Morrison, John | 19 | Huntingdon, Bedford | Whig | 71 | 1847 |
| Morton, Thomas | | Allegheny, Beaver, Butler | Rep | 26 | 1801-02 |
| Morton, Thomas | | Allegheny, Beaver, Butler | Rep | 27 | 1802-03 |
| Morton, Thomas | | Allegheny, Beaver, Butler | Rep | 28 | 1803-04 |
| Morton, Thomas | | Allegheny, Beaver, Butler | Rep | 29 | 1804-05 |
| Mott, Henry S. | 8 | Carbon, Monroe, Pike, Wayne | Dem | 85 | 1861 |
| Mott, Henry S. | 8 | Carbon, Monroe, Pike, Wayne | Dem | 86 | 1862 |
| Mott, Henry S. | 8 | Carbon, Monroe, Pike, Wayne | Dem | 87 | 1863 |
| Mowrey, Harold F., Jr. | 31 | Cumberland (Part), York (Part), Perry (Part) | Rep | 177-8 | 1993-94 |
| Mowrey, Harold F., Jr. | 31 | Cumberland (Part), York (Part), Perry (Part) | Rep | 179-80 | 1995-96 |
| Mowrey, Harold F., Jr. | 31 | Cumberland (Part), York (Part), Perry (Part) | Rep | 181-2 | 1997-98 |
| Mowrey, Harold F., Jr. | 31 | Cumberland (Part), York (Part), Perry (Part) | Rep | 183-4 | 1999-00 |
| Mowrey, Harold F., Jr. | 31 | Cumberland (Part), York (Part), Perry (Part) | Rep | 185-6 | 2001-02 |
| Mowrey, Harold F., Jr. | 31 | Cumberland (Part), York (Part), Perry (Part) | Rep | 187-8 | 2003-04 |
| Moyer, Henry G. | 10 | Bucks | Rep | 111 | 1895-96 |
| Moyer, Henry G. | 10 | Bucks | Rep | 112 | 1897-98 |
| Muehlbronner, Charles A. | 42 | Allegheny (Part) | Rep | 113 | 1899-00 |
| Muehlbronner, Charles A. | 42 | Allegheny (Part) | Rep | 114 | 1901-02 |
| Muhlenberg, Henry A. | 5 | Berks | Dem | 74 | 1850 |
| Muhlenberg, Henry A. | 5 | Berks | Dem | 75 | 1851 |
| Muhlenberg, Henry A. | 5 | Berks | Dem | 76 | 1852 |
| Mullin, George | 15 | Bedford, Somerset | Whig | 66 | 1842 |
| Mullin, George | 15 | Bedford, Somerset | Whig | 67 | 1843 |
| Mullin, George | 19 | Bedford, Huntingdon | Whig | 68 | 1844 |
| Mullin, William Vincent | 8 | Philadelphia (Part) | Dem | 141 | 1955-56 |
| Mullin, William Vincent | 8 | Philadelphia (Part) | Dem | 142 | 1957-58 |
| Mullin, William Vincent | 8 | Philadelphia (Part) | Dem | 143-4 | 1959-60 |
| Mullin, William Vincent | 8 | Philadelphia (Part) | Dem | 145-6 | 1961-62 |
| Mullin, William Vincent | 8 | Philadelphia (Part) | Dem | 147-8 | 1963-64 |
| Mullin, William Vincent | 8 | Philadelphia (Part) | Dem | 149-50 | 1965-66 |
| Mullin, William Vincent | 8 | Philadelphia (Part) | Dem | 151-2 | 1967-68 |
| Mumma, David | 16 | Dauphin, Lebanon | Rep | 94 | 1870 |
| Mumma, David | 16 | Dauphin, Lebanon | Rep | 95 | 1871 |
| Mumma, David | 12 | Dauphin, Lebanon | Rep | 96 | 1872 |
| Mundy, Leo C. | 21 | Luzerne (Part) | Dem | 132 | 1937-38 |
| Mundy, Leo C. | 21 | Luzerne (Part) | Dem | 133 | 1939-40 |
| Mundy, Leo C. | 21 | Luzerne (Part) | Dem | 134 | 1941-42 |
| Mundy, Leo C. | 21 | Luzerne (Part) | Dem | 135 | 1943-44 |
| Murdoch, W. Crawford | 44 | Allegheny (Part) | Rep | 123 | 1919-20 |
| Murdoch, W. Crawford | 44 | Allegheny (Part) | Rep | 124 | 1921-22 |
| Murphy, Austin J. | 46 | Greene, Washington (Part) | Dem | 155-6 | 1971-72 |
| Murphy, Austin J. | 46 | Greene, Fayette (Part), Washington (Part) | Dem | 157-8 | 1973-74 |
| Murphy, Austin J. | 46 | Greene, Fayette (Part), Washington (Part) | Dem | 159-60 | 1975-76 |
| Murphy, Austin J. | 46 | Greene, Fayette (Part), Washington (Part) | Dem | 161-2 | 1977-78 |
| Murphy, John T. | 8 | Philadelphia (Part) | Rep | 117 | 1907-08 |
| Murphy, John T. | 8 | Philadelphia (Part) | Rep | 118 | 1909-10 |
| Murphy, Timothy F. | 37 | Allegheny (Part), Washington (Part) | Rep | 181-2 | 1997-98 |
| Murphy, Timothy F. | 37 | Allegheny (Part), Washington (Part) | Rep | 183-4 | 1999-00 |
| Murphy, Timothy F. | 37 | Allegheny (Part), Washington (Part) | Rep | 185-6 | 2001-02 |
| Murphy, Timothy F. | 37 | Allegheny (Part), Washington (Part) | Rep | 187-8 | 2003-04 |
| Murray, Martin L. | 21 | Luzerne (Part) | Dem | 142 | 1957-58 |
| Murray, Martin L. | 21 | Luzerne (Part) | Dem | 143-4 | 1959-60 |
| Murray, Martin L. | 21 | Luzerne (Part) | Dem | 145-6 | 1961-62 |
| Murray, Martin L. | 21 | Luzerne (Part) | Dem | 147-8 | 1963-64 |
| Murray, Martin L. | 14 | Luzerne (Part) | Dem | 153-4 | 1969-70 |
| Murray, Martin L. | 14 | Luzerne (Part) | Dem | 155-6 | 1971-72 |
| Murray, Martin L. | 14 | Luzerne (Part) | Dem | 157-8 | 1973-74 |
| Murray, Martin L. | 14 | Luzerne (Part) | Dem | 159-60 | 1975-76 |
| Murray, Martin L. | 14 | Luzerne (Part) | Dem | 161-2 | 1977-78 |
| Murray, Martin L. | 14 | Luzerne (Part) | Dem | 163-4 | 1979-80 |
| Murray, Martin L. | 14 | Luzerne (Part) | Dem | 165-6 | 1981-82 |
| Murray, Thomas, Jr. | | Northumberland, Luzerne, Union, Columbia, Susquehanna | Dem | 39 | 1814-15 |
| Murray, Thomas, Jr. | 9 | Northumberland, Luzerne, Union, Columbia, Susquehanna | Dem | 40 | 1815-16 |
| Murray, Thomas, Jr. | 9 | Northumberland, Luzerne, Union, Columbia, Susquehanna | Dem | 41 | 1816-17 |
| Murray, Thomas, Jr. | 9 | Northumberland, Luzerne, Union, Columbia, Susquehanna | Dem | 42 | 1817-18 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 167-8 | 1983-84 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 169-70 | 1985-86 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 171-2 | 1987-88 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 173-4 | 1989-90 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 175-6 | 1991-92 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 177-8 | 1993-94 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 179-80 | 1995-96 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 181-2 | 1997-98 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 183-4 | 1999-00 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 185-6 | 2001-02 |
| Musto, Raphael J. | 14 | Luzerne (Part) | Dem | 187-8 | 2003-04 |
| Myer, E. Reed | 17 | Bradford, Susquehanna, Wyoming | Rep | 81 | 1857 |
| Myer, E. Reed | 9 | Bradford, Susquehanna, Wyoming | Rep | 82 | 1858 |
| Myer, E. Reed | 9 | Bradford, Susquehanna, Wyoming | Rep | 83 | 1859 |
| Myers, Christian | 25 | Armstrong, Indiana, Clarion | Whig | 75 | 1851 |
| Myers, Christian | 25 | Armstrong, Indiana, Clarion | Whig | 76 | 1852 |
| Myers, Christian | 25 | Armstrong, Indiana, Clarion | Whig | 77 | 1853 |
| Myers, Henry | 3 | Montgomery, Chester, Delaware | Dem | 61 | 1836-37 |
| Myers, Henry | 3 | Montgomery, Chester, Delaware | Dem | 62 | 1837-38 |
| Myers, Henry | 3 | Montgomery, Chester, Delaware | Dem | 63 | 1838-39 |
| Myers, Henry | 3 | Montgomery, Chester, Delaware | Dem | 64 | 1839-40 |
| Myers, Robert L., III | 31 | Cumberland (Part), York (Part) | Dem | 159-60 | 1975-76 |
| Myers, Robert L., III | 31 | Cumberland (Part), York (Part) | Dem | 157-8 | 1973-74 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 101 | 1877 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 102 | 1878 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 103 | 1879-80 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 104 | 1881-82 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 105 | 1883-84 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 106 | 1885-86 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 107 | 1887-88 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 108 | 1889-90 |
| Mylin, Amos H. | 13 | Lancaster (Part) | Rep | 109 | 1891-92 |