List of United States senators from Pennsylvania

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).

List of senators
! 1 ! rowspan=6 | 1
 * - style="height:2em"
 * align=left | WilliamMaclay.jpg 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 portrait.jpg Robert Morris
 * rowspan=6 align=right | Robert morris portrait.jpg Robert Morris


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Mar 4, 1791 – Dec 1, 1793
 * Legislature failed to elect.
 * rowspan=6 | 2
 * rowspan=2

! rowspan=2 | 2
 * - style="height:2em"
 * rowspan=2 align=left | Albert_Gallatin_(by_Gilbert_Stuart).jpg 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

! rowspan=7 | 3
 * - style="height:2em"
 * rowspan=7 align=left | Rossjamespa.jpg 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.

! rowspan=3 | 2
 * - 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.jpg William Bingham
 * rowspan=3 align=right | William Bingham.jpg William Bingham


 * - style="height:2em"
 * rowspan=5 | Re-elected in 1797.Retired.
 * rowspan=5 | 3


 * - style="height:2em"

! 3
 * - 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 | JPMuhlenberg.jpg Peter Muhlenberg


 * - style="height:2em"
 * nowrap | Jun 30, 1801 – Dec 17, 1801
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=3 | 4
 * - 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 | GeoLogan.jpg George Logan

! rowspan=3 | 4
 * - style="height:2em"
 * 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"

! rowspan=5 | 5
 * - 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 | AndrewGregg.jpg Andrew Gregg


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Jan 4, 1809 – Jan 9, 1809
 * Vacant

! rowspan=4 | 5
 * - style="height:2em"
 * rowspan=4 align=left | Michael Leib.jpg 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.


 * - style="height:2em"
 * rowspan=3 | Elected in 1808. Resigned to become Postmaster of Philadelphia.
 * rowspan=5 | 5


 * - style="height:2em"

! rowspan=5 | 6
 * - style="height:2em"
 * rowspan=3
 * rowspan=5 | 5
 * rowspan=5 | Elected in 1812. Retired.
 * rowspan=5 nowrap | Mar 4, 1813 – Mar 3, 1819
 * rowspan=5 | Democratic- Republican
 * rowspan=5 align=right | AbnerLacock.jpg Abner Lacock

! rowspan=4 | 6
 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Feb 14, 1814 – Feb 24, 1814
 * - style="height:2em"
 * - style="height:2em"
 * rowspan=4 align=left | JonathanRoberts.jpg 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"

! rowspan=4 | 7
 * - 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.jpg Walter Lowrie
 * rowspan=4 align=right | Walter Lowrie.jpg Walter Lowrie


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Mar 4, 1821 – Dec 10, 1821
 * Legislature failed to elect.
 * rowspan=4 | 7
 * rowspan=2

! rowspan=3 | 7
 * - style="height:2em"
 * rowspan=3 align=left | WFindley.jpg 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"

! rowspan=3 | 8
 * - 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 | WilliamMarks.jpg William Marks
 * rowspan=3 align=right | WilliamMarks.jpg William Marks

! rowspan=3 | 8
 * - style="height:2em"
 * rowspan=3 align=left | Isaac Barnard.jpg 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"

! rowspan=5 | 9
 * - 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 United States Senator - Brady-Handy.jpg William Wilkins


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Dec 6, 1831 – Dec 13, 1831

! 9
 * - style="height:2em"
 * align=left | Vice-president of the US George Dallas.jpg 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

! rowspan=5 | 10
 * - style="height:2em"
 * rowspan=5 align=left | SamuelMcKean.jpg 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
 * colspan=3 | Vacant

! rowspan=8 | 10
 * - 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.jpg James Buchanan


 * - style="height:2em"


 * - style="height:2em"
 * | Democratic
 * rowspan=4 | 9
 * rowspan=4 | Re-elected in 1836.
 * rowspan=6 | Democratic
 * 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

! rowspan=8 | 11
 * - style="height:2em"
 * rowspan=8 align=left | DSturgeon.jpg 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.
 * 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
 * colspan=3 | Vacant

! rowspan=2 | 11
 * - 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 | Smn Cameron-SecofWar.jpg Simon Cameron


 * - style="height:2em"

! rowspan=3 | 12
 * - 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 | JCooper.jpg James Cooper
 * rowspan=3 align=right | JCooper.jpg James Cooper

! rowspan=4 | 12
 * - style="height:2em"
 * rowspan=4 align=left |Richard Brodhead (US Senator from Pennsylvania).jpg 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

! rowspan=3 | 13
 * - 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.jpg William Bigler

! rowspan=2 | 13
 * - style="height:2em"
 * rowspan=2 align=left | Smn Cameron-SecofWar.jpg 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"

! rowspan=4 | 14
 * - 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 - Brady-Handy.jpg Edgar Cowan
 * rowspan=4 align=right | Edgar Cowan - Brady-Handy.jpg Edgar Cowan

! 14
 * - style="height:2em"
 * align=left | David Wilmot.png David Wilmot
 * | Republican
 * nowrap | Mar 14, 1861 – Mar 3, 1863
 * Elected in 1861 to finish Cameron's term.Retired.

! rowspan=3 | 15
 * - style="height:2em"
 * rowspan=3 align=left | Charles R. Buckalew - Brady-Handy.jpg 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"

! rowspan=6 | 15
 * - 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 | Smn Cameron-SecofWar.jpg Simon Cameron
 * rowspan=6 align=right | Smn Cameron-SecofWar.jpg Simon Cameron

! rowspan=3 | 16
 * - style="height:2em"
 * rowspan=3 align=left | JohnScottPA.jpg 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.
 * rowspan=3 | Re-elected in 1873.Resigned.

! rowspan=5 | 17
 * - style="height:2em"
 * rowspan=5 align=left | William A. Wallace - Brady-Handy.jpg 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
 * colspan=3 | Vacant

! rowspan=10 | 16
 * - 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 | JDonaldC2.jpg J. Donald Cameron


 * - style="height:2em"
 * rowspan=3 | 16
 * rowspan=3 | Re-elected in 1879.
 * rowspan=3 | Re-elected in 1879.

! rowspan=3 | 18
 * - style="height:2em"
 * rowspan=3 align=left | John I. Mitchell - Brady-Handy.jpg 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.
 * rowspan=3 | Re-elected in 1885.

! rowspan=10 | 19
 * - style="height:2em"
 * rowspan=6 align=left | MatthewQuay.jpg 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.
 * 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"

! rowspan=18 | 17
 * - 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 Penrose1.jpg Boies Penrose
 * rowspan=18 align=right | Boies Penrose1.jpg Boies Penrose


 * - 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 | MatthewQuay.jpg 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.

! rowspan=3 | 20
 * - style="height:2em"
 * rowspan=3 align=left | Philander Knox, bw photo portrait, 1904.jpg 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. 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.
 * rowspan=4 | Re-elected in 1909.

! rowspan=4 | 21
 * - style="height:2em"
 * rowspan=4 align=left | George Oliver.jpg 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.
 * rowspan=3 | Re-elected in 1914.

! rowspan=3 | 22
 * - style="height:2em"
 * rowspan=3 align=left | Philander Knox, bw photo portrait, 1904.jpg 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

! rowspan=3 | 23
 * - style="height:2em"
 * rowspan=3 align=left | William Evans Crow.jpg 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
 * colspan=3 | Vacant

! rowspan=5 | 18
 * - 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 Wharton Pepper 745bfa7049 o.jpg George W. Pepper


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Aug 2, 1922 – Aug 8, 1922

! rowspan=9 | 24
 * - style="height:2em"
 * rowspan=9 align=left | David Aiken Reed.jpg 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
 * rowspan=2 colspan=3 | Vacant


 * - style="height:2em"
 * rowspan=5 | Re-elected in 1928.Lost re-election.
 * rowspan=5 | 25
 * rowspan=3

! 19
 * - 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 cph.3a44489.jpg Joseph R. Grundy

! rowspan=8 | 20
 * - 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 | Jjdavis.jpg James J. Davis


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 25
 * rowspan=3 | Re-elected in 1932.
 * rowspan=3 | Re-elected in 1932.

! rowspan=6 | 25
 * - style="height:2em"
 * rowspan=6 align=left | Joseph Guffey.jpg 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.
 * 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"

! rowspan=3 | 21
 * - 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 | M001127.jpg Francis Myers
 * rowspan=3 align=right | M001127.jpg Francis Myers

! rowspan=6 | 26
 * - style="height:2em"
 * rowspan=6 align=left | EdwardMartinPA.jpg 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"

! rowspan=3 | 22
 * - 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 Henderson Duff.jpg James H. Duff
 * rowspan=3 align=right | James Henderson Duff.jpg James H. Duff


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1952.Retired.
 * rowspan=3 | 29


 * - style="height:2em"

! rowspan=6 | 23
 * - 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 | JosephSClark.jpg Joseph S. Clark Jr.
 * rowspan=6 align=right | JosephSClark.jpg Joseph S. Clark Jr.

! rowspan=9 | 27
 * - style="height:2em"
 * rowspan=9 align=left | SenHughScott.jpg 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.
 * rowspan=3 | Re-elected in 1962.Lost re-election.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1964.
 * rowspan=3 | 31


 * - style="height:2em"

! rowspan=6 | 24
 * - 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 | RichardSchweiker.jpg Richard Schweiker
 * rowspan=6 align=right | RichardSchweiker.jpg Richard Schweiker


 * - 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.
 * rowspan=3 | Re-elected in 1974.Retired.

! rowspan=8 | 28
 * - style="height:2em"
 * rowspan=8 align=left | John Heinz.jpg 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"

! rowspan=18 | 25
 * - 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_official_portrait.jpg Arlen Specter
 * rowspan=18 align=right | Arlen_Specter_official_portrait.jpg Arlen Specter


 * - 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.
 * 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

! rowspan=2 | 29
 * - style="height:2em"
 * rowspan=2 align=left | Harriswofford.jpg 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.
 * rowspan=3 | Re-elected in 1992.

! rowspan=6 | 30
 * - style="height:2em"
 * rowspan=6 align=left | Rick Santorum official photo.jpg 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.
 * 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.
 * rowspan=4 | Re-elected in 2004.Changed party on Apr 28, 2009.Lost renomination.

! rowspan=10 | 31
 * - style="height:2em"
 * rowspan=10 align=left | Bob Casey Jr. official photo.jpg 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

! rowspan=6 | 26
 * - 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, Official Portrait, 112th Congress.jpg Pat Toomey
 * rowspan=6 align=right | Pat Toomey, Official Portrait, 112th Congress.jpg Pat Toomey


 * - 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.
 * rowspan=3 | Re-elected in 2016.Retired.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2018.
 * rowspan=3 | 40


 * - style="height:2em"

! rowspan=3 | 27
 * - 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 official portrait.jpg John Fetterman
 * rowspan=3 align=right | John Fetterman official portrait.jpg John Fetterman


 * - 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.
 * colspan=5 | To be determined in the 2028 election.