List of United States Senators from Pennsylvania
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Pennsylvania ratified the Constitution on December 12, 1787.
Class 1
| Senator | Party | From | To |
|---|---|---|---|
| William Maclay | Anti-Administration | 1789 | 1791 |
| Albert Gallatin | Republican | 1793 | 1794 |
| James Ross | Federalist | 1794 | 1803 |
| Samuel Maclay | Republican | 1803 | 1809 |
| Michael Leib | Republican | 1809 | 1814 |
| Jonathan Roberts | Republican | 1814 | 1821 |
| William Findlay | Republican | 1821 | 1827 |
| Isaac D. Barnard | Democrat | 1827 | 1831 |
| George M. Dallas | Democrat | 1831 | 1833 |
| Samuel McKean | Democrat | 1833 | 1839 |
| Daniel Sturgeon | Democrat | 1840 | 1851 |
| Richard Brodhead | Democrat | 1851 | 1857 |
| Simon Cameron | Republican | 1857 | 1861 |
| David Wilmot | Republican | 1861 | 1863 |
| Charles R. Buckalew | Democrat | 1863 | 1869 |
| John Scott | Republican | 1869 | 1875 |
| William A. Wallace | Democrat | 1875 | 1881 |
| John I. Mitchell | Republican | 1881 | 1887 |
| Matthew S. Quay | Republican | 1887 | 1899 |
| Vacant | 1899 | 1901 | |
| Matthew S. Quay | Republican | 1901 | 1904 |
| Philander C. Knox | Republican | 1904 | 1909 |
| George T. Oliver | Republican | 1909 | 1917 |
| Philander C. Knox | Republican | 1917 | 1921 |
| William E. Crow | Republican | 1921 | 1922 |
| David A. Reed | Republican | 1922 | 1935 |
| Joseph F. Guffey | Democrat | 1935 | 1947 |
| Edward Martin | Republican | 1947 | 1959 |
| Hugh D. Scott Jr. | Republican | 1959 | 1977 |
| John Heinz | Republican | 1977 | 1991 |
| Harris Wofford | Democrat | 1991 | 1995 |
| Rick Santorum | Republican | 1995 |
Class 3
| Senator | Party | From | To |
|---|---|---|---|
| Robert Morris | Federalist | 1789 | 1795 |
| William Bingham | Federalist | 1795 | 1801 |
| John P. G. Muhlenberg | Republican | 1801 | |
| George Logan | Republican | 1801 | 1807 |
| Andrew Gregg | Republican | 1807 | 1813 |
| Abner Lacock | Republican | 1813 | 1819 |
| Walter Lowrie | Republican | 1819 | 1825 |
| William Marks | National Republican | 1825 | 1831 |
| William Wilkins | Democrat | 1831 | 1834 |
| James Buchanan | Democrat | 1834 | 1845 |
| Simon Cameron | Democrat | 1845 | 1849 |
| James Cooper | Whig | 1849 | 1855 |
| William Bigler | Democrat | 1856 | 1861 |
| Edgar Cowan | Republican | 1861 | 1867 |
| Simon Cameron | Republican | 1867 | 1877 |
| J. Donald Cameron | Republican | 1877 | 1897 |
| Boies Penrose | Republican | 1897 | 1921 |
| George W. Pepper | Republican | 1922 | 1927 |
| William S. Vare | Republican | 1927 | 1929 |
| Joseph R. Grundy | Republican | 1929 | 1930 |
| James J. Davis | Republican | 1930 | 1945 |
| Francis J. Myers | Democrat | 1945 | 1951 |
| James H. Duff | Republican | 1951 | 1957 |
| Joseph S. Clark | Democrat | 1957 | 1969 |
| Richard S. Schweiker | Republican | 1969 | 1981 |
| Arlen Specter | Republican | 1981 |