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).

Current delegation
Bob Casey Jr. (D)
John Fetterman (D)

List of senators

Class 1

Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2000, 2006, 2012, and 2018. The next election will be in 2024.

 C

Class 3

Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028.

# Senator Party Dates in office Electoral history T T Electoral history Dates in office Party Senator #
1
William Maclay		 Anti-
Admin.		 Mar 4, 1789 –
Mar 3, 1791		 Elected in 1788.
Lost re-election.		 1 1st 1 Elected in 1788.
Retired.		 Mar 4, 1789 –
Mar 3, 1795		 Pro-
Admin.
Robert Morris		 1
Vacant Mar 4, 1791 –
Dec 1, 1793		 Legislature failed to elect. 2 2nd
2
Albert Gallatin		 Anti-
Admin.		 Dec 2, 1793 –
Feb 28, 1794		 Elected to finish the vacant term.
Election voided.
3rd
Vacant Mar 1, 1794 –
Apr 23, 1794		  
3
James Ross		 Pro-
Admin.		 Apr 24, 1794 –
Mar 3, 1803		 Elected to finish Gallatin's term.
Federalist 4th 2 Elected in 1795.
Retired.		 Mar 4, 1795 –
Mar 3, 1801		 Federalist
William Bingham		 2
Re-elected in 1797.
Retired.		 3 5th
6th
7th 3 Elected in 1801.
Resigned to become Supervisor of Revenue of Pennsylvania.		 Mar 4, 1801 –
Jun 30, 1801		 Democratic-
Republican
Peter Muhlenberg		 3
  Jun 30, 1801 –
Dec 17, 1801		 Vacant
Elected to finish Muhlenberg's term.
Retired.		 Dec 17, 1801 –
Mar 3, 1807		 Democratic-
Republican
George Logan		 4
4 Samuel Maclay Democratic-
Republican		 Mar 4, 1803 –
Jan 4, 1809		 Elected in 1802.
Resigned.		 4 8th
9th
10th 4 Elected in 1806.
Retired.		 Mar 4, 1807 –
Mar 3, 1813		 Democratic-
Republican
Andrew Gregg		 5
Vacant Jan 4, 1809 –
Jan 9, 1809		 Vacant
5
Michael Leib		 Democratic-
Republican		 Jan 9, 1809 –
Feb 14, 1814		 Elected in 1809 to finish Maclay's term, having been elected to the next term.[1]
Elected in 1808.[2]
Resigned to become Postmaster of Philadelphia.		 5 11th
12th
13th 5 Elected in 1812.[3]
Retired.		 Mar 4, 1813 –
Mar 3, 1819		 Democratic-
Republican
Abner Lacock		 6
Vacant Feb 14, 1814 –
Feb 24, 1814
6
Jonathan Roberts		 Democratic-
Republican		 Feb 24, 1814 –
Mar 3, 1821		 Elected to finish Leib's term.
Re-elected in late 1814. 6 14th
15th
16th 6 Elected in 1818.
Retired.		 Mar 4, 1819 –
Mar 3, 1825		 Democratic-
Republican
Walter Lowrie		 7
Vacant Mar 4, 1821 –
Dec 10, 1821		 Legislature failed to elect. 7 17th
7
William Findlay		 Democratic-
Republican		 Dec 10, 1821 –
Mar 3, 1827		 Elected late in 1821.
Retired.
18th
Jacksonian 19th 7 Elected in 1825.
Lost re-election.		 Mar 4, 1825 –
Mar 3, 1831		 National
Republican
William Marks		 8
8
Isaac D. Barnard		 Jacksonian Mar 4, 1827 –
Dec 6, 1831		 Elected in 1826.
Resigned to due ill health.		 8 20th
21st
22nd 8 Elected in 1830.
Resigned to become U.S. Minister to Russia.		 Mar 4, 1831 –
Jun 30, 1834		 Jacksonian
William Wilkins		 9
Vacant Dec 6, 1831 –
Dec 13, 1831		  
9
George M. Dallas		 Jacksonian Dec 13, 1831 –
Mar 3, 1833		 Elected to finish Barnard's term.
Retired.
Vacant Mar 4, 1833 –
Dec 7, 1833		 Legislature failed to elect. 9 23rd
10
Samuel McKean		 Jacksonian Dec 7, 1833 –
Mar 3, 1839		 Elected late in 1833.
  Jun 30, 1834 –
Dec 6, 1834		 Vacant
Elected to finish Wilkins's term. Dec 6, 1834 –
Mar 5, 1845		 Jacksonian
James Buchanan		 10
24th
Democratic 25th 9 Re-elected in 1836. Democratic
Vacant Mar 4, 1839 –
Jan 14, 1840		 Legislature failed to elect. 10 26th
11
Daniel Sturgeon		 Democratic Jan 14, 1840 –
Mar 3, 1851		 Elected late in 1840.
27th
28th 10 Re-elected in 1843.
Resigned to become U.S. Secretary of State.
Re-elected in 1845.
Retired.		 11 29th
  Mar 5, 1845 –
Mar 13, 1845		 Vacant
Elected in 1845.
Retired.		 Mar 13, 1845 –
Mar 3, 1849		 Democratic
Simon Cameron		 11
30th
31st 11 Elected in 1849. Mar 4, 1849 –
Mar 3, 1855		 Whig
James Cooper		 12
12
Richard Brodhead		 Democratic Mar 4, 1851 –
Mar 3, 1857		 Elected in 1851. 12 32nd
33rd
34th 12 Legislature failed to elect. Mar 4, 1855 –
Jan 14, 1856		 Vacant
Elected late in 1856.
Retired.		 Jan 14, 1856 –
Mar 3, 1861		 Democratic
William Bigler		 13
13
Simon Cameron		 Republican Mar 4, 1857 –
Mar 4, 1861		 Elected in 1857.
Resigned to become U.S. Secretary of War.		 13 35th
36th
Vacant Mar 4, 1861 –
Mar 14, 1861		   37th 13 Elected in 1861.
Lost re-election.		 Mar 4, 1861 –
Mar 3, 1867		 Republican
Edgar Cowan		 14
14
David Wilmot		 Republican Mar 14, 1861 –
Mar 3, 1863		 Elected in 1861 to finish Cameron's term.
Retired.
15
Charles R. Buckalew		 Democratic Mar 4, 1863 –
Mar 3, 1869		 Elected in 1863. 14 38th
39th
40th 14 Elected in 1867. Mar 4, 1867 –
Mar 12, 1877		 Republican
Simon Cameron		 15
16
John Scott		 Republican Mar 4, 1869 –
Mar 3, 1875		 Elected in 1869.
Retired.		 15 41st
42nd
43rd 15 Re-elected in 1873.
Resigned.
17
William A. Wallace		 Democratic Mar 4, 1875 –
Mar 3, 1881		 Elected in 1875.
Lost re-election.		 16 44th
45th
  Mar 12, 1877 –
Mar 20, 1877		 Vacant
Elected in 1877 to finish his father's term. Mar 20, 1877 –
Mar 3, 1897		 Republican
J. Donald Cameron		 16
46th 16 Re-elected in 1879.
18
John I. Mitchell		 Republican Mar 4, 1881 –
Mar 3, 1887		 Elected in 1881. 17 47th
48th
49th 17 Re-elected in 1885.
19
Matthew Quay		 Republican Mar 4, 1887 –
Mar 3, 1899		 Elected in early 1887. 18 50th
51st
52nd 18 Re-elected in 1891.
Retired.
Re-elected in 1893.
Legislature failed to re-elect.		 19 53rd
54th
55th 19 Elected in 1897. Mar 4, 1897 –
Dec 31, 1921		 Republican
Boies Penrose		 17
Vacant Mar 4, 1899 –
Jan 16, 1901		 Quay was appointed to continue the term, but the Senate rejected his appointment. 20 56th

Matthew Quay		 Republican Jan 16, 1901 –
May 28, 1904		 Elected late in 1901.
Died.
57th
58th 20 Re-elected in 1903.
20
Philander C. Knox		 Republican Jun 10, 1904 –
Mar 3, 1909		 Appointed to continue Quay's term.
Elected in 1905 to finish Quay's term.[4]
Re-elected in 1905.[5]
Resigned to become U.S. Secretary of State.		 21 59th
60th
Vacant Mar 4, 1909 –
Mar 17, 1909		   61st 21 Re-elected in 1909.
21
George T. Oliver		 Republican Mar 17, 1909 –
Mar 3, 1917		 Elected to finish Knox's term
Re-elected in 1911.
Retired.		 22 62nd
63rd
64th 22 Re-elected in 1914.
22
Philander C. Knox		 Republican Mar 4, 1917 –
Oct 12, 1921		 Elected in 1916.
Died.		 23 65th
66th
67th 23 Re-elected in 1920.
Died.
Vacant Oct 12, 1921 –
Oct 24, 1921		  
23
William E. Crow		 Republican Oct 24, 1921 –
Aug 2, 1922		 Appointed to continue Knox's term.
Died.
  Dec 31, 1921 –
Jan 9, 1922		 Vacant
Appointed to continue Penrose's term.
Elected to finish Penrose's term.
Lost renomination.		 Jan 9, 1922 –
Mar 3, 1927		 Republican
George W. Pepper		 18
Vacant Aug 2, 1922 –
Aug 8, 1922		  
24
David A. Reed		 Republican Aug 8, 1922 –
Jan 3, 1935		 Appointed to continue Knox's term.
Elected to finish Knox's term.
Elected in 1922. 24 68th
69th
70th 24 William Scott Vare (R) was elected in 1926, but the Governor refused to certify the election and the Senate refused to qualify him. Mar 4, 1927 –
Dec 9, 1929		 Vacant
Re-elected in 1928.
Lost re-election.		 25 71st
Appointed to continue Vare's term.
Lost nomination to finish Vare's term.		 Dec 11, 1929 –
Dec 1, 1930		 Republican
Joseph R. Grundy		 19
Elected in 1930 to finish Vare's term Dec 2, 1930 –
Jan 3, 1945		 Republican
James J. Davis		 20
72nd
73rd 25 Re-elected in 1932.
25
Joe Guffey		 Democratic Jan 3, 1935 –
Jan 3, 1947		 Elected in 1934. 26 74th
75th
76th 26 Re-elected in 1938.
Lost re-election.
Re-elected in 1940.
Lost re-election.		 27 77th
78th
79th 27 Elected in 1944.
Lost re-election.		 Jan 3, 1945 –
Jan 3, 1951		 Democratic
Francis Myers		 21
26
Edward Martin		 Republican Jan 3, 1947 –
Jan 3, 1959		 Elected in 1946. 28 80th
81st
82nd 28 Elected in 1950.
Lost re-election.		 Jan 3, 1951 –
Jan 3, 1957		 Republican
James H. Duff		 22
Re-elected in 1952.
Retired.		 29 83rd
84th
85th 29 Elected in 1956. Jan 3, 1957 –
Jan 3, 1969		 Democratic
Joseph S. Clark Jr.		 23
27
Hugh Scott		 Republican Jan 3, 1959 –
Jan 3, 1977		 Elected in 1958. 30 86th
87th
88th 30 Re-elected in 1962.
Lost re-election.
Re-elected in 1964. 31 89th
90th
91st 31 Elected in 1968. Jan 3, 1969 –
Jan 3, 1981		 Republican
Richard Schweiker		 24
Re-elected in 1970.
Retired.		 32 92nd
93rd
94th 32 Re-elected in 1974.
Retired.
28
John Heinz		 Republican Jan 3, 1977 –
Apr 4, 1991		 Elected in 1976. 33 95th
96th
97th 33 Elected in 1980. Jan 3, 1981 –
Jan 3, 2011		 Republican
Arlen Specter		 25
Re-elected in 1982. 34 98th
99th
100th 34 Re-elected in 1986.
Re-elected in 1988.
Died.		 35 101st
102nd
Vacant Apr 4, 1991 –
May 9, 1991		  
29
Harris Wofford		 Democratic May 9, 1991 –
Jan 3, 1995		 Appointed to continue Heinz's term.
Elected to finish Heinz's term.
Lost re-election.
103rd 35 Re-elected in 1992.
30
Rick Santorum		 Republican Jan 3, 1995 –
Jan 3, 2007		 Elected in 1994. 36 104th
105th
106th 36 Re-elected in 1998.
Re-elected in 2000.
Lost re-election.		 37 107th
108th
109th 37 Re-elected in 2004.
Changed party on Apr 28, 2009.
Lost renomination.
31
Bob Casey Jr.		 Democratic Jan 3, 2007 –
present		 Elected in 2006. 38 110th
111th
Democratic
112th 38 Elected in 2010. Jan 3, 2011 –
Jan 3, 2023		 Republican
Pat Toomey		 26
Re-elected in 2012. 39 113th
114th
115th 39 Re-elected in 2016.
Retired.
Re-elected in 2018. 40 116th
117th
118th 40 Elected in 2022. Jan 3, 2023 –
present		 Democratic
John Fetterman		 27
To be determined in the 2024 election. 41 119th
120th
121st 41 To be determined in the 2028 election.
# Senator Party Years in office Electoral history T C T Electoral history Years in office Party Senator #
Class 1 Class 3

Notes
  1. "Pennsylvania 1809 U.S. Senate, Special". Tufts Digital Collations and Archives. A New Nation Votes: American Election Returns 1787–1825. Tufts University. Retrieved February 3, 2018., citing Journal of the Pennsylvania House of Representatives, 1808, pp. 174–176.
  2. "U.S. Senate Election - 13 Dec 1808" (PDF). Wilkes University. Retrieved December 21, 2012.
  3. "Pennsylvania 1812 U.S. Senate". Tufts Digital Collations and Archives. A New Nation Votes: American Election Returns 1787–1825. Tufts University. Retrieved February 23, 2018., citing Journal of the Pennsylvania State Senate, 1812, pp. 41–43.
  4. Byrd, p. 159.
  5. The World Almanac and Encyclopedia 1906. New York: The Press Publishing Co. New York World. 1905. p. 108.

References

See also
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