Pennsylvania ratified the United States Constitution on December 12, 1787, and elects its U.S. senators to class 1 and class 3. Officeholders are popularly elected, for a six-year term, beginning January 3. Elections are held the first Tuesday after November 1. Before 1914, they were chosen by the Pennsylvania General Assembly; before 1935, their terms began March 4. The state's current U.S. senators are Democrats Bob Casey Jr. (since 2007) and John Fetterman (since 2023). Arlen Specter was Pennsylvania's longest-serving senator (1981–2011).
|- style="height:2em"! 1| align=left |
William Maclay| | Anti-
Admin.| nowrap | Mar 4, 1789 –
Mar 3, 1791| Elected in 1788.Lost re-election.| 1| | rowspan=6 | 1| rowspan=6 | Elected in 1788.Retired.| rowspan=6 nowrap | Mar 4, 1789 –
Mar 3, 1795| rowspan=6 | Pro-
Admin.| rowspan=6 align=right |
Robert Morris! rowspan=6 | 1
|- style="height:2em"| colspan=3 | Vacant| nowrap | Mar 4, 1791 –
Dec 1, 1793| Legislature failed to elect.| rowspan=6 | 2| rowspan=2
|- style="height:2em"! rowspan=2 | 2| rowspan=2 align=left |
Albert Gallatin| rowspan=2 | Anti-
Admin.| rowspan=2 nowrap | Dec 2, 1793 –
Feb 28, 1794| rowspan=2 | Elected to finish the vacant term.Election voided.
|- style="height:2em"| rowspan=3
|- style="height:2em"| colspan=3 | Vacant| nowrap | Mar 1, 1794 –
Apr 23, 1794|
|- style="height:2em"! rowspan=7 | 3| rowspan=7 align=left |
James Ross| | Pro-
Admin.| rowspan=7 nowrap | Apr 24, 1794 –
Mar 3, 1803| rowspan=2 | Elected to finish the vacant term that happened from 1791 to 1793.
|- style="height:2em"| rowspan=6 | Federalist| | rowspan=3 | 2| rowspan=3 | Elected in 1795.Retired.| rowspan=3 nowrap | Mar 4, 1795 –
Mar 3, 1801| rowspan=3 | Federalist| rowspan=3 align=right |
William Bingham! rowspan=3 | 2
|- style="height:2em"| rowspan=5 | Re-elected in 1797.Retired.| rowspan=5 | 3|
|- style="height:2em"|
|- style="height:2em"| rowspan=3 | rowspan=5 | 3| Elected in 1801.Resigned to become Supervisor of Revenue of Pennsylvania.| nowrap | Mar 4, 1801 –
Jun 30, 1801| | Democratic-
Republican| align=right |
Peter Muhlenberg! 3
|- style="height:2em"| | nowrap | Jun 30, 1801 –
Dec 17, 1801| colspan=3 | Vacant
|- style="height:2em"| rowspan=3 | Elected to finish Muhlenberg's term.Retired.| rowspan=3 nowrap | Dec 17, 1801 –
Mar 3, 1807| rowspan=3 | Democratic-
Republican| rowspan=3 align=right |
George Logan! rowspan=3 | 4
|- style="height:2em"! rowspan=3 | 4| rowspan=3 align=left | Samuel Maclay| rowspan=3 | Democratic-
Republican| rowspan=3 nowrap | Mar 4, 1803 –
Jan 4, 1809| rowspan=3 | Elected in 1802.Resigned.| rowspan=5 | 4|
|- style="height:2em"|
|- style="height:2em"| rowspan=3 | rowspan=5 | 4| rowspan=5 | Elected in 1806.Retired.| rowspan=5 nowrap | Mar 4, 1807 –
Mar 3, 1813| rowspan=5 | Democratic-
Republican| rowspan=5 align=right |
Andrew Gregg! rowspan=5 | 5
|- style="height:2em"| colspan=3 | Vacant| nowrap | Jan 4, 1809 –
Jan 9, 1809| Vacant
|- style="height:2em"! rowspan=4 | 5| rowspan=4 align=left |
Michael Leib| rowspan=4 | Democratic-
Republican| rowspan=4 nowrap | Jan 9, 1809 –
Feb 14, 1814| Elected in 1809 to finish Maclay's term, having been elected to the next term.[1]
|- style="height:2em"| rowspan=3 | Elected in 1808.[2] Resigned to become Postmaster of Philadelphia.| rowspan=5 | 5|
|- style="height:2em"|
|- style="height:2em"| rowspan=3 | rowspan=5 | 5| rowspan=5 | Elected in 1812.[3] Retired.| rowspan=5 nowrap | Mar 4, 1813 –
Mar 3, 1819| rowspan=5 | Democratic-
Republican| rowspan=5 align=right |
Abner Lacock! rowspan=5 | 6
|- style="height:2em"| colspan=3 | Vacant| nowrap | Feb 14, 1814 –
Feb 24, 1814||- style="height:2em"! rowspan=4 | 6| rowspan=4 align=left |
Jonathan Roberts| rowspan=4 | Democratic-
Republican| rowspan=4 nowrap | Feb 24, 1814 –
Mar 3, 1821| Elected to finish Leib's term.
|- style="height:2em"| rowspan=3 | Re-elected in late 1814.| rowspan=3 | 6|
|- style="height:2em"|
|- style="height:2em"| | rowspan=4 | 6| rowspan=4 | Elected in 1818.Retired.| rowspan=4 nowrap | Mar 4, 1819 –
Mar 3, 1825| rowspan=4 | Democratic-
Republican| rowspan=4 align=right |
Walter Lowrie! rowspan=4 | 7
|- style="height:2em"| colspan=3 | Vacant| nowrap | Mar 4, 1821 –
Dec 10, 1821| Legislature failed to elect.| rowspan=4 | 7| rowspan=2
|- style="height:2em"! rowspan=3 | 7| rowspan=3 align=left |
William Findlay| rowspan=2 | Democratic-
Republican| rowspan=3 nowrap | Dec 10, 1821 –
Mar 3, 1827| rowspan=3 | Elected late in 1821.Retired.
|- style="height:2em"|
|- style="height:2em"| | Jacksonian| | rowspan=3 | 7| rowspan=3 | Elected in 1825.Lost re-election.| rowspan=3 nowrap | Mar 4, 1825 –
Mar 3, 1831| rowspan=3 | National
Republican| rowspan=3 align=right |
William Marks! rowspan=3 | 8
|- style="height:2em"! rowspan=3 | 8| rowspan=3 align=left |
Isaac D. Barnard| rowspan=3 | Jacksonian| rowspan=3 nowrap | Mar 4, 1827 –
Dec 6, 1831| rowspan=3 | Elected in 1826.Resigned to due ill health.| rowspan=5 | 8|
|- style="height:2em"|
|- style="height:2em"| rowspan=3 | rowspan=8 | 8| rowspan=5 | Elected in 1830.Resigned to become U.S. Minister to Russia.| rowspan=5 nowrap | Mar 4, 1831 –
Jun 30, 1834| rowspan=5 | Jacksonian| rowspan=5 align=right |
William Wilkins! rowspan=5 | 9
|- style="height:2em"| colspan=3 | Vacant| nowrap | Dec 6, 1831 –
Dec 13, 1831|
|- style="height:2em"! 9| align=left |
George M. Dallas| | Jacksonian| nowrap | Dec 13, 1831 –
Mar 3, 1833| Elected to finish Barnard's term.Retired.
|- style="height:2em"| colspan=3 | Vacant| nowrap | Mar 4, 1833 –
Dec 7, 1833| Legislature failed to elect.| rowspan=6 | 9| rowspan=4
|- style="height:2em"! rowspan=5 | 10| rowspan=5 align=left |
Samuel McKean| rowspan=4 | Jacksonian| rowspan=5 nowrap | Dec 7, 1833 –
Mar 3, 1839| rowspan=5 | Elected late in 1833.
|- style="height:2em"| | nowrap | Jun 30, 1834 –
Dec 6, 1834| colspan=3 | Vacant
|- style="height:2em"| rowspan=2 | Elected to finish Wilkins's term.| rowspan=8 nowrap | Dec 6, 1834 –
Mar 5, 1845| rowspan=2 | Jacksonian| rowspan=8 align=right |
James Buchanan! rowspan=8 | 10
|- style="height:2em"|
|- style="height:2em"| | Democratic| | rowspan=4 | 9| rowspan=4 | Re-elected in 1836.| rowspan=6 | Democratic
|- style="height:2em"| colspan=3 | Vacant| nowrap | Mar 4, 1839 –
Jan 14, 1840| Legislature failed to elect.| rowspan=4 | 10| rowspan=2
|- style="height:2em"! rowspan=8 | 11| rowspan=8 align=left |
Daniel Sturgeon| rowspan=8 | Democratic| rowspan=8 nowrap | Jan 14, 1840 –
Mar 3, 1851| rowspan=3 | Elected late in 1840.
|- style="height:2em"|
|- style="height:2em"| | rowspan=5 | 10| rowspan=2 | Re-elected in 1843.Resigned to become U.S. Secretary of State.
|- style="height:2em"| rowspan=5 | Re-elected in 1845.Retired.| rowspan=5 | 11| rowspan=3
|- style="height:2em"| | nowrap | Mar 5, 1845 –
Mar 13, 1845| colspan=3 | Vacant
|- style="height:2em"| rowspan=2 | Elected in 1845 to finish Buchanan's term.Retired.| rowspan=2 nowrap | Mar 13, 1845 –
Mar 3, 1849| rowspan=2 | Democratic| rowspan=2 align=right |
Simon Cameron! rowspan=2 | 11
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 11| rowspan=3 | Elected in 1849.| rowspan=3 nowrap | Mar 4, 1849 –
Mar 3, 1855| rowspan=3 | Whig| rowspan=3 align=right |
James Cooper! rowspan=3 | 12
|- style="height:2em"! rowspan=4 | 12| rowspan=4 align=left |
Richard Brodhead| rowspan=4 | Democratic| rowspan=4 nowrap | Mar 4, 1851 –
Mar 3, 1857| rowspan=4 | Elected in 1851.| rowspan=4 | 12|
|- style="height:2em"|
|- style="height:2em"| rowspan=2 | rowspan=4 | 12| Legislature failed to elect.| nowrap | Mar 4, 1855 –
Jan 14, 1856| colspan=3 | Vacant
|- style="height:2em"| rowspan=3 | Elected late in 1856.Retired.| rowspan=3 nowrap | Jan 14, 1856 –
Mar 3, 1861| rowspan=3 | Democratic| rowspan=3 align=right |
William Bigler! rowspan=3 | 13
|- style="height:2em"! rowspan=2 | 13| rowspan=2 align=left |
Simon Cameron| rowspan=2 | Republican| rowspan=2 nowrap | Mar 4, 1857 –
Mar 4, 1861| rowspan=2 | Elected in 1857.Resigned to become U.S. Secretary of War.| rowspan=4 | 13|
|- style="height:2em"|
|- style="height:2em"| colspan=3 | Vacant| nowrap | Mar 4, 1861 –
Mar 14, 1861| | rowspan=2 | rowspan=4 | 13| rowspan=4 | Elected in 1861.Lost re-election.| rowspan=4 nowrap | Mar 4, 1861 –
Mar 3, 1867| rowspan=4 | Republican| rowspan=4 align=right |
Edgar Cowan! rowspan=4 | 14
|- style="height:2em"! 14| align=left |
David Wilmot| | Republican| nowrap | Mar 14, 1861 –
Mar 3, 1863| Elected in 1861 to finish Cameron's term.Retired.
|- style="height:2em"! rowspan=3 | 15| rowspan=3 align=left |
Charles R. Buckalew| rowspan=3 | Democratic| rowspan=3 nowrap | Mar 4, 1863 –
Mar 3, 1869| rowspan=3 | Elected in 1863.| rowspan=3 | 14|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 14| rowspan=3 | Elected in 1867.| rowspan=6 nowrap | Mar 4, 1867 –
Mar 12, 1877| rowspan=6 | Republican| rowspan=6 align=right |
Simon Cameron! rowspan=6 | 15
|- style="height:2em"! rowspan=3 | 16| rowspan=3 align=left |
John Scott| rowspan=3 | Republican| rowspan=3 nowrap | Mar 4, 1869 –
Mar 3, 1875| rowspan=3 | Elected in 1869.Retired.| rowspan=3 | 15|
|- style="height:2em"|
|- style="height:2em"| | rowspan=5 | 15| rowspan=3 | Re-elected in 1873.Resigned.
|- style="height:2em"! rowspan=5 | 17| rowspan=5 align=left |
William A. Wallace| rowspan=5 | Democratic| rowspan=5 nowrap | Mar 4, 1875 –
Mar 3, 1881| rowspan=5 | Elected in 1875.Lost re-election.| rowspan=5 | 16|
|- style="height:2em"| rowspan=3
|- style="height:2em"| | nowrap | Mar 12, 1877 –
Mar 20, 1877| colspan=3 | Vacant
|- style="height:2em"| Elected in 1877 to finish his father's term.| rowspan=10 nowrap | Mar 20, 1877 –
Mar 3, 1897| rowspan=10 | Republican| rowspan=10 align=right |
J. Donald Cameron! rowspan=10 | 16
|- style="height:2em"| | rowspan=3 | 16| rowspan=3 | Re-elected in 1879.
|- style="height:2em"! rowspan=3 | 18| rowspan=3 align=left |
John I. Mitchell| rowspan=3 | Republican| rowspan=3 nowrap | Mar 4, 1881 –
Mar 3, 1887| rowspan=3 | Elected in 1881.| rowspan=3 | 17|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 17| rowspan=3 | Re-elected in 1885.
|- style="height:2em"! rowspan=10 | 19| rowspan=6 align=left |
Matthew Quay| rowspan=6 | Republican| rowspan=6 nowrap | Mar 4, 1887 –
Mar 3, 1899| rowspan=3 | Elected in early 1887.| rowspan=3 | 18|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 18| rowspan=3 | Re-elected in 1891.Retired.
|- style="height:2em"| rowspan=3 | Re-elected in 1893.Legislature failed to re-elect.| rowspan=3 | 19|
|- style="height:2em"|
|- style="height:2em"| | rowspan=4 | 19| rowspan=4 | Elected in 1897.| rowspan=18 nowrap | Mar 4, 1897 –
Dec 31, 1921| rowspan=18 | Republican| rowspan=18 align=right |
Boies Penrose! rowspan=18 | 17
|- style="height:2em"| colspan=2 | Vacant| nowrap | Mar 4, 1899 –
Jan 16, 1901| Quay was appointed to continue the term, but the Senate rejected his appointment.| rowspan=5 | 20| rowspan=2
|- style="height:2em"| rowspan=3 align=left |
Matthew Quay| rowspan=3 | Republican| rowspan=3 nowrap | Jan 16, 1901 –
May 28, 1904| rowspan=3 | Elected late in 1901.Died.
|- style="height:2em"|
|- style="height:2em"| rowspan=2 | rowspan=4 | 20| rowspan=4 | Re-elected in 1903.
|- style="height:2em"! rowspan=3 | 20| rowspan=3 align=left |
Philander C. Knox| rowspan=3 | Republican| rowspan=3 nowrap | Jun 10, 1904 –
Mar 3, 1909| Appointed to continue Quay's term.Elected in 1905 to finish Quay's term.
|- style="height:2em"| rowspan=2 | Re-elected in 1905.[4] Resigned to become U.S. Secretary of State.| rowspan=4 | 21|
|- style="height:2em"|
|- style="height:2em"| colspan=3 | Vacant| nowrap | Mar 4, 1909 –
Mar 17, 1909| | rowspan=2 | rowspan=4 | 21| rowspan=4 | Re-elected in 1909.
|- style="height:2em"! rowspan=4 | 21| rowspan=4 align=left |
George T. Oliver| rowspan=4 | Republican| rowspan=4 nowrap | Mar 17, 1909 –
Mar 3, 1917| Elected to finish Knox's term
|- style="height:2em"| rowspan=3 | Re-elected in 1911.Retired.| rowspan=3 | 22|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 22| rowspan=3 | Re-elected in 1914.
|- style="height:2em"! rowspan=3 | 22| rowspan=3 align=left |
Philander C. Knox| rowspan=3 | Republican| rowspan=3 nowrap | Mar 4, 1917 –
Oct 12, 1921| rowspan=3 | Elected in 1916.Died.| rowspan=9 | 23|
|- style="height:2em"|
|- style="height:2em"| rowspan=7 | rowspan=9 | 23| rowspan=3 | Re-elected in 1920.Died.
|- style="height:2em"| colspan=3 | Vacant| nowrap | Oct 12, 1921 –
Oct 24, 1921|
|- style="height:2em"! rowspan=3 | 23| rowspan=3 align=left |
William E. Crow| rowspan=3 | Republican| rowspan=3 nowrap | Oct 24, 1921 –
Aug 2, 1922| rowspan=3 | Appointed to continue Knox's term.Died.
|- style="height:2em"| | nowrap | Dec 31, 1921 –
Jan 9, 1922| colspan=3 | Vacant
|- style="height:2em"| rowspan=5 | Appointed to continue Penrose's term.Elected to finish Penrose's term.Lost renomination.| rowspan=5 nowrap | Jan 9, 1922 –
Mar 3, 1927| rowspan=5 | Republican| rowspan=5 align=right |
George W. Pepper! rowspan=5 | 18
|- style="height:2em"| colspan=3 | Vacant| nowrap | Aug 2, 1922 –
Aug 8, 1922|
|- style="height:2em"! rowspan=9 | 24| rowspan=9 align=left |
David A. Reed| rowspan=9 | Republican| rowspan=9 nowrap | Aug 8, 1922 –
Jan 3, 1935| Appointed to continue Knox's term.Elected to finish Knox's term.
|- style="height:2em"| rowspan=3 | Elected in 1922.| rowspan=3 | 24|
|- style="height:2em"|
|- style="height:2em"| | rowspan=5 | 24| rowspan=2 | William Scott Vare (R) was elected in 1926, but the Governor refused to certify the election and the Senate refused to qualify him.| rowspan=2 nowrap | Mar 4, 1927 –
Dec 9, 1929| rowspan=2 colspan=3 | Vacant
|- style="height:2em"| rowspan=5 | Re-elected in 1928.Lost re-election.| rowspan=5 | 25| rowspan=3
|- style="height:2em"| Appointed to continue Vare's term.Lost nomination to finish Vare's term.| nowrap | Dec 11, 1929 –
Dec 1, 1930| | Republican| align=right |
Joseph R. Grundy! 19
|- style="height:2em"| rowspan=2 | Elected in 1930 to finish Vare's term| rowspan=8 nowrap | Dec 2, 1930 –
Jan 3, 1945| rowspan=8 | Republican| rowspan=8 align=right |
James J. Davis! rowspan=8 | 20
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 25| rowspan=3 | Re-elected in 1932.
|- style="height:2em"! rowspan=6 | 25| rowspan=6 align=left |
Joe Guffey| rowspan=6 | Democratic| rowspan=6 nowrap | Jan 3, 1935 –
Jan 3, 1947| rowspan=3 | Elected in 1934.| rowspan=3 | 26|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 26| rowspan=3 | Re-elected in 1938.Lost re-election.
|- style="height:2em"| rowspan=3 | Re-elected in 1940.Lost re-election.| rowspan=3 | 27|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 27| rowspan=3 | Elected in 1944.Lost re-election.| rowspan=3 nowrap | Jan 3, 1945 –
Jan 3, 1951| rowspan=3 | Democratic| rowspan=3 align=right |
Francis Myers! rowspan=3 | 21
|- style="height:2em"! rowspan=6 | 26| rowspan=6 align=left |
Edward Martin| rowspan=6 | Republican| rowspan=6 nowrap | Jan 3, 1947 –
Jan 3, 1959| rowspan=3 | Elected in 1946.| rowspan=3 | 28|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 28| rowspan=3 | Elected in 1950.Lost re-election.| rowspan=3 nowrap | Jan 3, 1951 –
Jan 3, 1957| rowspan=3 | Republican| rowspan=3 align=right |
James H. Duff! rowspan=3 | 22
|- style="height:2em"| rowspan=3 | Re-elected in 1952.Retired.| rowspan=3 | 29|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 29| rowspan=3 | Elected in 1956.| rowspan=6 nowrap | Jan 3, 1957 –
Jan 3, 1969| rowspan=6 | Democratic| rowspan=6 align=right |
Joseph S. Clark Jr.! rowspan=6 | 23
|- style="height:2em"! rowspan=9 | 27| rowspan=9 align=left |
Hugh Scott| rowspan=9 | Republican| rowspan=9 nowrap | Jan 3, 1959 –
Jan 3, 1977| rowspan=3 | Elected in 1958.| rowspan=3 | 30|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 30| rowspan=3 | Re-elected in 1962.Lost re-election.
|- style="height:2em"| rowspan=3 | Re-elected in 1964.| rowspan=3 | 31|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 31| rowspan=3 | Elected in 1968.| rowspan=6 nowrap | Jan 3, 1969 –
Jan 3, 1981| rowspan=6 | Republican| rowspan=6 align=right |
Richard Schweiker! rowspan=6 | 24
|- style="height:2em"| rowspan=3 | Re-elected in 1970.Retired.| rowspan=3 | 32|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 32| rowspan=3 | Re-elected in 1974.Retired.
|- style="height:2em"! rowspan=8 | 28| rowspan=8 align=left |
John Heinz| rowspan=8 | Republican| rowspan=8 nowrap | Jan 3, 1977 –
Apr 4, 1991| rowspan=3 | Elected in 1976.| rowspan=3 | 33|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 33| rowspan=3 | Elected in 1980.| rowspan=18 nowrap | Jan 3, 1981 –
Jan 3, 2011| rowspan=17 | Republican| rowspan=18 align=right |
Arlen Specter! rowspan=18 | 25
|- style="height:2em"| rowspan=3 | Re-elected in 1982.| rowspan=3 | 34|
|- style="height:2em"|
|- style="height:2em"| | rowspan=5 | 34| rowspan=5 | Re-elected in 1986.
|- style="height:2em"| rowspan=2 | Re-elected in 1988.Died.| rowspan=5 | 35|
|- style="height:2em"| rowspan=3
|- style="height:2em"| colspan=3 | Vacant| nowrap | Apr 4, 1991 –
May 9, 1991|
|- style="height:2em"! rowspan=2 | 29| rowspan=2 align=left |
Harris Wofford| rowspan=2 | Democratic| rowspan=2 nowrap | May 9, 1991 –
Jan 3, 1995| rowspan=2 | Appointed to continue Heinz's term.Elected to finish Heinz's term.Lost re-election.
|- style="height:2em"| | rowspan=3 | 35| rowspan=3 | Re-elected in 1992.
|- style="height:2em"! rowspan=6 | 30| rowspan=6 align=left |
Rick Santorum| rowspan=6 | Republican| rowspan=6 nowrap | Jan 3, 1995 –
Jan 3, 2007| rowspan=3 | Elected in 1994.| rowspan=3 | 36|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 36| rowspan=3 | Re-elected in 1998.
|- style="height:2em"| rowspan=3 | Re-elected in 2000.Lost re-election.| rowspan=3 | 37|
|- style="height:2em"|
|- style="height:2em"| | rowspan=4 | 37| rowspan=4 | Re-elected in 2004.Changed party on Apr 28, 2009.Lost renomination.
|- style="height:2em"! rowspan=10 | 31| rowspan=10 align=left |
Bob Casey Jr.| rowspan=10 | Democratic| rowspan=10 nowrap | Jan 3, 2007 –
present| rowspan=4 | Elected in 2006.| rowspan=4 | 38|
|- style="height:2em"| rowspan=2
|- style="height:2em"| | Democratic
|- style="height:2em"| | rowspan=3 | 38| rowspan=3 | Elected in 2010.| rowspan=6 nowrap | Jan 3, 2011 –
Jan 3, 2023| rowspan=6 | Republican| rowspan=6 align=right |
Pat Toomey! rowspan=6 | 26
|- style="height:2em"| rowspan=3 | Re-elected in 2012.| rowspan=3 | 39|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 39| rowspan=3 | Re-elected in 2016.Retired.
|- style="height:2em"| rowspan=3 | Re-elected in 2018.| rowspan=3 | 40|
|- style="height:2em"|
|- style="height:2em"| | rowspan=3 | 40| rowspan=3 | Elected in 2022.| rowspan=3 nowrap | Jan 3, 2023 –
present| rowspan=3 | Democratic| rowspan=3 align=right |
John Fetterman! rowspan=3 | 27
|- style="height:2em"| rowspan=3 colspan=5 | To be determined in the 2024 election.| rowspan=3| 41|
|- style="height:2em"|
|- style="height:2em"| | 41| colspan=5 | To be determined in the 2028 election.