| House Name | Dist.# | County | Party | Session # | Dates | Notes |
|---|
|
|
| O'Boyle, Thomas F. | 4 | Lackawanna | Dem | 125 | 1923-24 |
| O'Brien, Bernard F. | 6 | Luzerne | Dem | 149-50 | 1965-66 |
| O'Brien, Bernard F. | 6 | Luzerne | Dem | 151-52 | 1967-68 |
| O'Brien, Bernard F. | 121 | Luzerne | Dem | 153-54 | 1969-70 |
| O'Brien, Bernard F. | 121 | Luzerne | Dem | 155-56 | 1971-72 |
| O'Brien, Bernard F. | 121 | Luzerne | Dem | 157-58 | 1973-74 |
| O'Brien, Bernard F. | 121 | Luzerne | Dem | 159-60 | 1975-76 |
| O'Brien, Bernard F. | 121 | Luzerne | Dem | 161-62 | 1977-78 |
| O'Brien, Bernard F. | 121 | Luzerne | Dem | 163-64 | 1979-80 |
| O'Brien, Bernard F. | 7 | Luzerne | Dem | 147-8 | 1963-64 |
| O'Brien, David F. | 4 | Schuylkill | Dem | 113 | 1899-00 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 161-62 | 1977-78 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 163-64 | 1979-80 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 165-66 | 1981-82 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 167-68 | 1983-84 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 169-70 | 1985-86 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 171-72 | 1987-88 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 173-74 | 1989-90 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 175-76 | 1991-92 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 177-78 | 1993-94 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 179-80 | 1995-96 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 181-82 | 1997-98 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 183-84 | 1999-00 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 185-86 | 2001-02 |
| O'Brien, Dennis M. | 169 | Philadelphia | Rep | 187-88 | 2003-04 |
| O'Brien, Frank W. | 22 | Allegheny | Dem | 153-54 | 1969-70 |
| O'Brien, George F. | 5 | Luzerne | Dem | 116 | 1905-06 |
| O'Brien, George F. | 3 | Luzerne | Dem | 117 | 1907-08 |
| O'Brien, James A. | 5 | Philadelphia | Rep | 98 | 1874 |
| O'Brien, Joseph M. | 19 | Philadelphia | Dem | 132 | 1937-38 |
| O'Brien, Joseph M. | 19 | Philadelphia | Dem | 133 | 1939-40 |
| O'Brien, Joseph M. | 19 | Philadelphia | Dem | 134 | 1941-42 |
| O'Brien, Joseph M. | 19 | Philadelphia | Dem | 135 | 1943-44 |
| O'Brien, Joseph M. | 19 | Philadelphia | Dem | 136 | 1945-46 |
| O'Brien, Joseph M. | 22 | Philadelphia | Dem | 142 | 1957-58 |
| O'Brien, Richard | | Philadelphia City | Rep | 33 | 1808-09 |
| O'Bryan, Thomas | | Perry | Dem | 67 | 1843 |
| O'Bryan, Thomas | | Perry | Dem | 68 | 1844 |
| O'Bryan, Thomas | | Perry | Dem | 69 | 1845 |
| O'Connell, Frank J., Jr. | 5 | Luzerne | Rep | 151-52 | 1967-68 |
| O'Connell, Frank J., Jr. | 120 | Luzerne | Rep | 153-54 | 1969-70 |
| O'Connell, Frank J., Jr. | 120 | Luzerne | Rep | 155-56 | 1971-72 |
| O'Connell, Frank J., Jr. | 120 | Luzerne | Rep | 157-58 | 1973-74 |
| O'Connell, Frank J., Jr. | 120 | Luzerne | Rep | 159-60 | 1975-76 |
| O'Connell, Frank J., Jr. | 120 | Luzerne | Rep | 161-62 | 1977-78 |
| O'Connor, Albert L. | 2 | Cambria | Dem | 130 | 1933-34 |
| O'Conner, Albert L. | 2 | Cambria | Dem | 132 | 1937-38 |
| O'Conner, Albert L. | 2 | Cambria | Dem | 133 | 1939-40 |
| O'Conner, Albert L. | 2 | Cambria | Dem | 134 | 1941-42 |
| O'Conner, Albert L. | 2 | Cambria | Dem | 135 | 1943-44 |
| O'Conner, Albert L. | 2 | Cambria | Dem | 136 | 1945-46 |
| O'Conner, Albert L. | 2 | Cambria | Dem | 137 | 1947-48 |
| O'Connor, William P. | | Northumberland | Dem | 117 | 1907-08 |
| O'Dare, James J. | 8 | Philadelphia | Rep | 133 | 1939-40 |
| O'Dare, James J. | 8 | Philadelphia | Rep | 134 | 1941-42 |
| O'Dare, James J. | 8 | Philadelphia | Rep | 135 | 1943-44 |
| O'Dare, James J. | 8 | Philadelphia | Rep | 136 | 1945-46 |
| O'Dare, James J. | 8 | Philadelphia | Rep | 137 | 1947-48 |
| O'Dare, James J. | 8 | Philadelphia | Rep | 138 | 1949-50 |
| O'Dell, Ford E. | 3 | Erie | Rep | 149-50 | 1965-66 |
| O'Dell, Ford E. | 3 | Erie | Rep | 142 | 1957-58 |
| O'Dell, Ford E. | 3 | Erie | Rep | 143-4 | 1959-60 |
| O'Dell, Ford E. | 3 | Erie | Rep | 145-6 | 1961-62 |
| O'Dell, Ford E. | 3 | Erie | Rep | 147-8 | 1963-64 |
| O'Donnell, Ambrose C. | | Carbon | Dem | 136 | 1945-46 |
| O'Donnell, James A. | 1 | Northampton | Dem | 143-4 | 1959-60 |
| O'Donnell, James A. | 1 | Northampton | Dem | 145-6 | 1961-62 |
| O'Donnell, James A. | 1 | Northampton | Dem | 147-8 | 1963-64 |
| O'Donnell, James A. | 1 | Northampton | Dem | 149-50 | 1965-66 |
| O'Donnell, James P. | 31 | Philadelphia | Dem | 143-4 | 1959-60 |
| O'Donnell, James P. | 31 | Philadelphia | Dem | 145-6 | 1961-62 |
| O'Donnell, James P. | 31 | Philadelphia | Dem | 147-8 | 1963-64 |
| O'Donnell, James P. | 1 | Philadelphia | Dem | 149-50 | 1965-66 |
| O'Donnell, James P. | 20 | Philadelphia | Dem | 151-52 | 1967-68 |
| O'Donnell, James P. | 188 | Philadelphia | Dem | 153-54 | 1969-70 |
| O'Donnell, James P. | 188 | Philadelphia | Dem | 155-56 | 1971-72 |
| O'Donnell, Michael J. | 16 | Philadelphia | Rep | 137 | 1947-48 |
| O'Donnell, Michael J. | 16 | Philadelphia | Rep | 138 | 1949-50 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 157-58 | 1973-74 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 159-60 | 1975-76 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 161-62 | 1977-78 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 163-64 | 1979-80 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 165-66 | 1981-82 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 167-68 | 1983-84 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 169-70 | 1985-86 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 171-72 | 1987-88 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 173-74 | 1989-90 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 175-76 | 1991-92 |
| O'Donnell, Robert W. | 198 | Philadelphia | Dem | 177-78 | 1993-94 |
| O'Hara, I. H. | 6 | Philadelphia | Union | 88 | 1864 |
| O'Keefe, John J. | 8 | Allegheny | Dem | 130 | 1933-34 |
| O'Keefe, John J. | 8 | Allegheny | Dem | 131 | 1935-36 |
| O'Keefe, John J. | 8 | Allegheny | Dem | 132 | 1937-38 |
| O'Keefe, John J. | 8 | Allegheny | Dem | 133 | 1939-40 |
| O'Keefe, Peter J. | 161 | Delaware | Dem | 159-60 | 1975-76 |
| O'Keefe, Peter J. | 161 | Delaware | Dem | 161-62 | 1977-78 |
| O'Lenihan, Dennis | 5 | Luzerne & Lackawanna | Nat Green | 103 | 1879-80 |
| O'Malley, Charles P. | 4 | Lackawanna | Rep | 111 | 1895-96 |
| O'Mullen, Joseph J. | 12 | Philadelphia | Dem | 134 | 1941-42 |
| O'Neil, Frank M. | 2 | Clearfield | Dem | 141 | 1955-56 |
| O'Neil, Frank M. | 2 | Blair | Dem | 143-4 | 1959-60 |
| O'Neil, Frank M. | 2 | Clearfield | Dem | 149-50 | 1965-66 |
| O'Neil, John | 3 | Allegheny | Dem | 103 | 1879-80 |
| O'Neil, John | 3 | Allegheny | Dem | 104 | 1881-82 |
| O'Neill, Bernard T. | 29 | Allegheny | Rep | 187-88 | 2003-04 |
| O'Neill, Charles | | Philadelphia City | Whig | 74 | 1850 |
| O'Neill, Charles | | Philadelphia City | Whig | 75 | 1851 |
| O'Neill, Charles | | Philadelphia City | Whig | 76 | 1852 |
| O'Neill, Charles | 6 | Philadelphia | Rep | 84 | 1860 |
| O'Neill, D. L. | | Luzerne | Dem | 93 | 1869 |
| O'Neill, Frederic Hugh | 10 | Philadelphia | Rep | 120 | 1913-14 |
| O'Neill, Harry | 4 | Philadelphia | Rep | 98 | 1874 |
| O'Neill, Harry | 26 | Philadelphia | Rep | 99 | 1875 |
| O'Neill, Harry | 26 | Philadelphia | Rep | 100 | 1876 |
| O'Neill, Harry | 26 | Philadelphia | Rep | 101 | 1877 |
| O'Neill, Harry | 26 | Philadelphia | Rep | 102 | 1878 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 128 | 1929-30 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 129 | 1931-32 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 130 | 1933-34 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 131 | 1935-36 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 132 | 1937-38 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 133 | 1939-40 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 134 | 1941-42 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 135 | 1943-44 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 136 | 1945-46 |
| O'Neill, Harry P. | 4 | Lackawanna | Dem | 137 | 1947-48 |
| O'Neill, John A. | 5 | Philadelphia | Rep | 127 | 1927-28 |
| O'Neill, Patrick | 2 | Philadelphia | Dem | 104 | 1881-82 |
| O'Neill, Patrick | 2 | Philadelphia | Dem | 105 | 1883-84 |
| O'Neill, Robert | | Philadelphia | Dem | 48 | 1823-24 |
| O'Neill, Robert | | Philadelphia | Dem | 49 | 1824-25 |
| O'Pake, Michael A. | 126 | Berks | Dem | 153-54 | 1969-70 |
| O'Pake, Michael A. | 126 | Berks | Dem | 155-56 | 1971-72 |
| O'Rourke, John M. | 12 | Allegheny | Rep | 130 | 1933-34 |
| O'Shell, Thomas | 9 | Allegheny | Rep | 117 | 1907-08 |
| O'Shell, Thomas | 9 | Allegheny | Rep | 118 | 1909-10 |
| Oakes, Samuel | | Columbia, Montour, Wyoming, Sullivan | Dem | 84 | 1860 |
| Oaks, Albert J. | 2 | Cambria | Rep | 121 | 1915-16 |
| Oaks, Samuel | | Columbia, Montour, Wyoming, Sullivan | Dem | 83 | 1859 |
| Ober, B. Frank | 2 | Dauphin | Rep | 115 | 1903-04 |
| Ober, B. Frank | 2 | Dauphin | Rep | 116 | 1905-06 |
| Ober, Michael | | Lancaster | Rep | 85 | 1861 |
| Odenheimer, George U. | | Berks, Schuylkill | Dem | 49 | 1824-25 |
| Odenheimer, Philip | | Philadelphia City | Rep | 26 | 1801-02 |
| Odenheimer, Philip | | Philadelphia City | Rep | 27 | 1802-03 |
| Odenheimer, Philip | | Philadelphia City | Rep | 28 | 1803-04 |
| Odenheimer, Philip | | Philadelphia City | Rep | 29 | 1804-05 |
| Odenheimer, Philip | | Philadelphia City | Rep | 33 | 1808-09 |
| Odenheimer, Philip | | Philadelphia City | Rep | 34 | 1809-10 |
| Odorisio, Helen | 9 | Delaware | Rep | 151-52 | 1967-68 |
| Odorisio, Rocco A. | 3 | Delaware | Rep | 143-4 | 1959-60 |
| Odorisio, Rocco A. | 3 | Delaware | Rep | 145-6 | 1961-62 |
| Odorisio, Rocco A. | 3 | Delaware | Rep | 147-8 | 1963-64 |
| Odorisio, Rocco A. | 1 | Delaware | Rep | 149-50 | 1965-66 |
| Odorisio, Rocco A. | 9 | Delaware | Rep | 151-52 | 1967-68 |
| Ogden, John M. | | Philadelphia | Dem | 57 | 1832-33 |
| Ogden, Joseph F. | | Wyoming | Rep | 122 | 1917-18 |
| Ogilvie, Robert S. | 1 | Dauphin | Rep | 140 | 1953-54 |
| Ogilvie, Robert S. | 1 | Dauphin | Rep | 141 | 1955-56 |
| Ogilvie, Robert S. | 1 | Dauphin | Rep | 142 | 1957-58 |
| Ogilvie, Robert S. | 1 | Dauphin | Rep | 143-4 | 1959-60 |
| Ogilvie, Robert S. | 1 | Dauphin | Rep | 145-6 | 1961-62 |
| Ogilvie, Robert S. | 1 | Dauphin | Rep | 147-8 | 1963-64 |
| Ogilvie, Robert S. | | Dauphin | Rep | 149-50 | 1965-66 |
| Ogle, Alexander | | Somerset | Rep | 28 | 1803-04 |
| Ogle, Alexander | | Somerset | Rep | 29 | 1804-05 |
| Ogle, Alexander | | Somerset, Cambria | Convent | 31 | 1806-07 |
| Ogle, Alexander | | Somerset, Cambria | Rep | 32 | 1807-08 |
| Ogle, Alexander | | Somerset, Cambria | Rep | 33 | 1808-09 |
| Ogle, Alexander | | Somerset, Cambria | Rep | 36 | 1811-12 |
| Ogle, Alexander | | Somerset, Cambria | Dem | 44 | 1819-20 |
| Ogle, Alexander | | Somerset, Cambria | Dem | 48 | 1823-24 |
| Ogle, Alexander, Jr. | | Somerset, Cambria | Dem | 46 | 1821-22 |
| Ogle, John G. | | Somerset | Rep | 124 | 1921-22 |
| Ogle, John G. | | Somerset | Rep | 125 | 1923-24 |
| Okell, Frank T. | 2 | Lackawanna | Rep | 110 | 1893-94 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 165-66 | 1981-82 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 167-68 | 1983-84 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 169-70 | 1985-86 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 171-72 | 1987-88 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 173-74 | 1989-90 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 175-76 | 1991-92 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 177-78 | 1993-94 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 179-80 | 1995-96 |
| Olasz, Richard D. | 38 | Allegheny | Dem | 181-82 | 1997-98 |
| Old, James | | Lancaster | Fed | 16 | 1791-92 |
| Old, James | | Lancaster | Fed | 17 | 1792-93 |
| Old, James | | Lancaster | Fed | 18 | 1793-94 |
| Oliphant. Ethelbert P. | | Fayette | Dem | 55 | 1830-31 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 157-58 | 1973-74 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 159-60 | 1975-76 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 161-62 | 1977-78 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 163-64 | 1979-80 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 165-66 | 1981-82 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 167-68 | 1983-84 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 169-70 | 1985-86 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 171-72 | 1987-88 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 173-74 | 1989-90 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 175-76 | 1991-92 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 177-78 | 1993-94 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 179-80 | 1995-96 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 181-82 | 1997-98 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 183-84 | 1999-00 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 185-86 | 2001-02 |
| Oliver, Frank Louis | 195 | Philadelphia | Dem | 187-88 | 2003-04 |
| Oliver, John | | Mifflin | Rep | 15 | 1790-91 |
| Oliver, John | | Mifflin | Rep | 16 | 1791-92 |
| Oliver, John | | Mifflin | Rep | 17 | 1792-93 |
| Oliver, M. W. | | Crawford | Rep | 97 | 1873 |
| Oliver, M. W. | | Crawford | Rep | 98 | 1874 |
| Oliver, Walter | | Mercer | Fed | 47 | 1822-23 |
| Oliver, Walter | | Mercer | Fed | 49 | 1824-25 |
| Oliver, Walter | | Mercer | Dem | 55 | 1830-31 |
| Oliver, Walter | | Mercer | Dem | 56 | 1831-32 |
| Oliver, Walter | | Mercer | AM | 57 | 1832-33 |
| Oliver, Walter | | Mercer | Dem | 60 | 1835-36 |
| Oliver, Walter | | Mercer | AM | 61 | 1836-37 |
| Olmstead, A. G. | | Potter, Tioga | Rep | 87 | 1863 |
| Olmstead, A. G. | | Potter, Tioga | Union | 88 | 1864 |
| Olmstead, A. G. | | Potter, Tioga | Union | 89 | 1865 |
| Olsen, Olaf E. | 6 | Allegheny | Dem | 138 | 1949-50 |
| Olsen, Olaf E. | 6 | Allegheny | Dem | 139 | 1951-52 |
| Olsen, Olaf E. | 6 | Allegheny | Dem | 140 | 1953-54 |
| Olsen, Olaf E. | 9 | Allegheny | Dem | 141 | 1955-56 |
| Olwine, Abraham | | Philadelphia | Dem | 72 | 1848 |
| Olwine, Abraham | | Philadelphia | Dem | 75 | 1851 |
| Ominsky, Joseph | 18 | Philadelphia | Dem | 131 | 1935-36 |
| Ominsky, Joseph | 18 | Philadelphia | Dem | 132 | 1937-38 |
| Ominsky, Joseph | 18 | Philadelphia | Dem | 133 | 1939-40 |
| Orban, Frank A. | | Somerset | Rep | 137 | 1947-48 |
| Orban, Frank A. | | Somerset | Rep | 138 | 1949-50 |
| Orie, Jane Clare | 28 | Allegheny | Rep | 181-82 | 1997-98 |
| Orie, Jane Clare | 28 | Allegheny | Rep | 183-84 | 1999-00 |
| Orme, Seth | 4 | Schuylkill | Rep | 111 | 1895-96 |
| Orme, Seth | 4 | Schuylkill | Rep | 112 | 1897-98 |
| Ormsby, J. W. | | Mercer | Dem | 105 | 1883-84 |
| Orr, David | 3 | Montgomery | Rep | 125 | 1923-24 |
| Orr, David | 3 | Montgomery | Rep | 126 | 1925-26 |
| Orr, James B. | | Franklin | Dem/Amer | 79 | 1855 |
| Orr, James B. | | Franklin | Dem | 80 | 1856 |
| Orr, John | | Cumberland | Convent | 31 | 1806-07 |
| Orr, John | | Cumberland | Rep | 32 | 1807-08 |
| Orr, John | | Cumberland | Rep | 33 | 1808-09 |
| Orr, Robert, Jr. | | Armstrong, Indiana, Jefferson | Dem | 43 | 1818-19 |
| Orr, Robert, Jr. | | Armstrong, Indiana, Jefferson | Dem | 44 | 1819-20 |
| Orr, Robert, Jr. | | Armstrong, Indiana, Jefferson | Dem | 45 | 1820-21 |
| Orr, Samuel J. | | Mercer | Rep | 124 | 1921-22 |
| Orr, Thomas | 7 | Philadelphia | Rep | 114 | 1901-02 |
| Orth, Godleib | | Lebanon . | Dem | 48 | 1823-24 |
| Orvis, John H. | | Centre | Dem | 97 | 1873 |
| Orvis, John H. | | Centre | Dem | 98 | 1874 |
| Orwig, Samuel H. | | Juniata, Union, Snyder | Union | 88 | 1864 |
| Orwig, Samuel H. | | Lycoming, Union, Snyder | Union | 89 | 1865 |
| Osborn, Thomas, Jr. | 2 | Erie | Rep | 106 | 1885-86 |
| Osborn, Thomas, Jr. | 2 | Erie | Rep | 107 | 1887-88 |
| Osborne, Bryan H. | | Venango | Rep | 115 | 1903-04 |
| Osborne, Bryan H. | | Venango | Rep | 116 | 1905-06 |
| Osborne, Robert, Jr. | 10 | Philadelphia | Rep | 117 | 1907-08 |
| Osbourn, Francis A. | 20 | Philadelphia | Rep | 101 | 1877 |
| Osbourn, Francis A. | 20 | Philadelphia | Rep | 102 | 1878 |
| Osler, David W. | | Lycoming | Dem | 113 | 1899-00 |
| Osler, David W. | | Lycoming | Dem | 114 | 1901-02 |
| Oster, George W. | | Bedford | Rep | 117 | 1907-08 |
| Oster, George W. | | Bedford | Rep | 118 | 1909-10 |
| Osterhout, Peter M. | | Susquehanna, Wyoming | Union | 89 | 1865 |
| Osterhout, Peter M. | | Susquehanna, Wyoming | Union | 90 | 1866 |
| Osterhout, Thomas | | Columbia, Montour, Wyoming, Sullivan | Dem | 85 | 1861 |
| Ostrander, William A. | | McKean | Rep | 121 | 1915-16 |
| Ostroff, Isidor | 3 | Philadelphia | Dem | 132 | 1937-38 |
| Otto, Henry P. | 16 | Allegheny | Rep | 147-8 | 1963-64 |
| Otto, Henry P. | 16 | Allegheny | Rep | 149-50 | 1965-66 |
| Otto, John A. | | Schuylkill | Whig | 73 | 1849 |
| Ouram, Charles | 15 | Philadelphia | Rep | 116 | 1905-06 |
| Overfield, Moses | | Luzerne, Wyoming | Dem | 67 | 1843 |
| Overfield, Nicholas | | Luzerne | Dem | 56 | 1831-32 |
| Overfield, William | | Northampton, Wayne, Pike | Dem | 49 | 1824-25 |
| Overfield, William | | Northampton, Wayne, Pike | Dem | 50 | 1825-26 |
| Overfield, William | | Northampton, Wayne, Pike | Jack | 53 | 1828-29 |
| Overfield, William | | Northampton, Wayne, Pike | Dem | 54 | 1829-30 |
| Overholzer, Henry D. | | Lancaster | Fed | 51 | 1826-27 |
| Owen, Benjamin | | Lancaster | Fed | 46 | 1821-22 |
| Owen, David E. | | Northumberland, Union, Columbia | Rep | 39 | 1814-15 |
| Owen, Eleazar | | Perry | Dem | 70 | 1846 |
| Owen, Joshua T. | | Philadelphia | Dem | 82 | 1858 |
| Owens, George W. | | Huntingdon | Rep | 107 | 1887-88 |
| Owens, John | | Huntingdon | Jack | 53 | 1828-29 |
| Owens, Thomas A. | 2 | Cambria | Dem | 134 | 1941-42 |
| Owens, Thomas A. | 2 | Cambria | Dem | 135 | 1943-44 |
| Owens, Thomas A. | 2 | Cambria | Dem | 136 | 1945-46 |
| Owens, William H. | 4 | Luzerne | Rep | 117 | 1907-08 |
| Owens, William H. | 4 | Luzerne | Rep | 118 | 1909-10 |