List of United States Senators from Pennsylvania

This is a chronological listing of the United States Senators from Pennsylvania.

United States Senators 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, and before 1935, their terms began March 4.

List of Senators

Class 1

Class 1 U.S. Senators belong to the electoral cycle that has recently been contested in 1994, 2000, 2006, and 2012. The next election will be in 2018.

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Class 3

Class 3 U.S. Senators belong to the electoral cycle that has recently been contested in 1998, 2004, and 2010. The next election will be in 2016.

# Senator Party Years in office Electoral history T
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T
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Electoral history Years in office Party Senator #
1
William Maclay
Anti-Administration March 4, 1789 –
March 3, 1791
Elected in 1788.

Lost re-election.
1 1st Congress 1 Elected in 1788.

Retired.
March 4, 1789 –
March 3, 1795
Pro-
Administration

Robert Morris
1
Vacant March 4, 1791 –
December 1, 1793
  2 2nd Congress
3rd Congress
2
Albert Gallatin
Anti-Administration December 2, 1793 –
February 28, 1794
Elected in early 1793.

Election voided for failure to meet the residency requirements for eligibility to the office.
Vacant March 1, 1794 –
April 23, 1794
 
3
James Ross
Federalist April 24, 1794 –
March 3, 1803
Elected to finish Gallatin's term
4th Congress 2 Elected in 1795.

Retired.
March 4, 1795 –
March 3, 1801
Federalist
William Bingham
2
Re-elected in 1797.

Retired.
3 5th Congress
6th Congress
7th Congress 3 Elected in 1801.

Resigned to become Supervisor of Revenue for Pennsylvania.
March 4, 1801 –
June 30, 1801
Democratic-
Republican

J. Peter G. Muhlenberg
3
  June 30, 1801 –
December 17, 1801
Vacant
Elected to finish Muhlenberg's term.

Retired.
December 17, 1801 –
March 3, 1807
Democratic-
Republican

George Logan
4
4 Samuel Maclay Democratic-
Republican
March 4, 1803 –
January 4, 1809
Elected in 1802.

Resigned, believing he would lose re-election.
4 8th Congress
9th Congress
10th Congress 4 Elected in 1806.

Retired.
March 4, 1807 –
March 3, 1813
Democratic-
Republican

Andrew Gregg
5
Vacant January 4, 1809 –
January 9, 1809
Vacant
5
Michael Leib
Democratic-
Republican
January 9, 1809 –
February 14, 1814
Elected to finish Maclay's term, having already won election to the next term.
Elected in 1808.

Resigned to become Postmaster of Philadelphia.
5 11th Congress
12th Congress
13th Congress 5 Elected in 1812.

Retired.
March 4, 1813 –
March 3, 1819
Democratic-
Republican

Abner Lacock
6
Vacant February 14, 1814 –
February 24, 1814
Vacant
6
Jonathan Roberts
Democratic-
Republican
February 24, 1814 –
March 3, 1821
Elected to finish Leib's term
Re-elected in late 1814.

[Data unknown/missing. You can help!]
6 14th Congress
15th Congress
16th Congress 6 Elected in 1818.

Retired.
March 4, 1819 –
March 3, 1825
Democratic-
Republican

Walter Lowrie
7
Vacant March 4, 1821 –
December 10, 1821
Legislature failed to elect 7 17th Congress
7
William Findlay
Democratic-
Republican
December 10, 1821 –
March 3, 1827
Elected late in 1821.

Retired.
Jacksonian
Republican
18th Congress Crawford
Republican
Jacksonian 19th Congress 7 Elected in 1825.

Lost re-election.
March 4, 1825 –
March 3, 1831
Anti-Jacksonian
William Marks
8
8
Isaac D. Barnard
Jacksonian March 4, 1827 –
December 6, 1831
Elected in 1826.

Resigned to due ill health.
8 20th Congress Adams
21st Congress Anti-Jacksonian
22nd Congress 8 Elected in 1830.

Resigned to become U.S. Minister to Russia.
March 4, 1831 –
June 30, 1834
Jacksonian
William Wilkins
9
Vacant December 6, 1831 –
December 13, 1831
 
9
George Mifflin Dallas
Jacksonian December 13, 1831 –
March 3, 1833
Elected to finish Barnard's term.

Retired.
Vacant March 4, 1833 –
December 7, 1833
Legislature failed to elect. 9 23rd Congress
10
Samuel McKean
Jacksonian December 7, 1833 –
March 3, 1839
Elected late in 1833.

[Data unknown/missing. You can help!]
  June 30, 1834 –
December 6, 1834
Vacant
Elected to finish Wilkins's term.

[Data unknown/missing. You can help!]
December 6, 1834 –
March 5, 1845
Jacksonian
James Buchanan
10
24th Congress
Democratic 25th Congress 9 Re-elected in 1836. Democratic
Vacant March 4, 1839 –
January 14, 1840
Legislature failed to elect 10 26th Congress
11
Daniel Sturgeon
Democratic January 14, 1840 –
March 3, 1851
Elected late in 1840.
27th Congress
28th Congress 10 Re-elected in 1843.

Resigned to become U.S. Secretary of State.
Re-elected in 1845.

Retired.
11 29th Congress
  March 5, 1845 –
March 13, 1845
Vacant
Elected in 1845.

Retired.
March 13, 1845 –
March 3, 1849
Democratic
Simon Cameron
11
30th Congress
31st Congress 11 Elected in 1849.

[Data unknown/missing. You can help!]
March 4, 1849 –
March 3, 1855
Whig
James Cooper
12
12
Richard Brodhead
Democratic March 4, 1851 –
March 3, 1857
Elected in 1851.

[Data unknown/missing. You can help!]
12 32nd Congress
33rd Congress
34th Congress 12 Legislature failed to elect in 1856 March 4, 1855 –
January 14, 1856
Vacant
Elected late in 1856.

Retired.
January 14, 1856 –
March 3, 1861
Democratic
William Bigler
13
13
Simon Cameron
Republican March 4, 1857 –
March 3, 1861
Elected in 1857.

Resigned to become U.S. Secretary of War.
13 35th Congress
36th Congress
Vacant March 4, 1861 –
March 14, 1861
  37th Congress 13 Elected in 1861.

Lost re-election.
March 4, 1861 –
March 3, 1867
Republican
Edgar Cowan
14
14
David Wilmot
Republican March 14, 1861 –
March 3, 1863
Elected in 1861 to finish Cameron's term.

Retired.
15
Charles R. Buckalew
Democratic March 4, 1863 –
March 3, 1869
Elected in 1863.

[Data unknown/missing. You can help!]
14 38th Congress
39th Congress
40th Congress 14 Elected in 1867. March 4, 1867 –
March 12, 1877
Republican
Simon Cameron
15
16
John Scott
Republican March 4, 1869 –
March 3, 1875
Elected in 1869.

Retired.
15 41st Congress
42nd Congress
43rd Congress 15 Re-elected in 1873.

Resigned.
17
William A. Wallace
Democratic March 4, 1875 –
March 3, 1881
Elected in early 1875.

Lost re-election.
16 44th Congress
45th Congress
  March 12, 1877 –
March 20, 1877
Vacant
Elected in 1877 to finish his father's term March 20, 1877 –
March 3, 1897
Republican
J. Donald Cameron
16
46th Congress 16 Re-elected in 1879.
18
John I. Mitchell
Republican March 4, 1881 –
March 3, 1887
Elected in early 1881.

[Data unknown/missing. You can help!]
17 47th Congress
48th Congress
49th Congress 17 Re-elected in 1885.
19
Matthew S. Quay
Republican March 4, 1887 –
March 3, 1899
Elected in early 1887. 18 50th Congress
51st Congress
52nd Congress 18 Re-elected in 1891.

[Data unknown/missing. You can help!]
Re-elected in early 1893.

Legislature failed to re-elect.
19 53rd Congress
54th Congress
55th Congress 19 Elected in 1897. March 4, 1897 –
December 31, 1921
Republican
Boies Penrose
17
Vacant March 4, 1899 –
January 16, 1901
Quay was appointed to continue the term, but the Senate declared him not entitled to the seat 20 56th Congress

Matthew S. Quay
Republican January 16, 1901 –
May 28, 1904
Elected late in 1901.

Died.
57th Congress
58th Congress 20 Re-elected in 1903.
20
Philander C. Knox
Republican June 10, 1904 –
March 3, 1909
Appointed to continue Quay's term.

Elected to finish Quay's term.
Re-elected in early 1905.

Resigned to become U.S. Secretary of State.
21 59th Congress
60th Congress
Vacant March 4, 1909 –
March 17, 1909
  61st Congress 21 Re-elected in 1909.
21
George T. Oliver
Republican March 17, 1909 –
March 3, 1917
Elected to finish Knox's term
Re-elected in early 1911.

Retired.
22 62nd Congress
63rd Congress
64th Congress 22 Re-elected in 1914.
22
Philander C. Knox
Republican March 4, 1917 –
October 12, 1921
Elected in 1916.

Died.
23 65th Congress
66th Congress
67th Congress 23 Re-elected in 1920.

Died.
Vacant October 12, 1921 –
October 24, 1921
 
23
William E. Crow
Republican October 24, 1921 –
August 2, 1922
Appointed to continue Knox's term.

Died.
  December 31, 1921 –
January 9, 1922
Vacant
Appointed to continue Penrose's term.

Elected to finish Penrose's term.

Lost renomination.
January 9, 1922 –
March 3, 1927
Republican
George Wharton Pepper
18
Vacant August 2, 1922 –
August 8, 1922
 
24
David A. Reed
Republican August 8, 1922 –
January 3, 1935
Appointed to continue Knox's term.

Elected to finish Knox's term.
Elected in 1922. 24 68th Congress
69th Congress
70th Congress 24 Elected in 1926.

Senate refused to seat due to allegations of corruption surrounding the election.
March 4, 1927 –
December 6, 1929
Republican
William S. Vare
19
Re-elected in 1928.

Lost re-election.
25 71st Congress
  December 6, 1929 –
December 11, 1929
Vacant
Appointed to continue Vare's term.

Lost nomination to finish Vare's term.
December 11, 1929 –
December 1, 1930
Republican
Joseph R. Grundy
20
Elected to finish Vare's term December 2, 1930 –
January 3, 1945
Republican
James J. Davis
21
72nd Congress
73rd Congress 25 Re-elected in 1932.
25
Joseph F. Guffey
Democratic January 3, 1935 –
January 3, 1947
Elected in 1934. 26 74th Congress
75th Congress
76th Congress 26 Re-elected in 1938.

Lost re-election.
Re-elected in 1940.

Lost re-election.
27 77th Congress
78th Congress
79th Congress 27 Elected in 1944.

Lost re-election.
January 3, 1945 –
January 3, 1951
Democratic
Francis J. Myers
22
26
Edward Martin
Republican January 3, 1947 –
January 3, 1959
Elected in 1946. 28 80th Congress
81st Congress
82nd Congress 28 Elected in 1950.

Lost re-election.
January 3, 1951 –
January 3, 1957
Republican
James H. Duff
23
Re-elected in 1952.

Retired.
29 83rd Congress
84th Congress
85th Congress 29 Elected in 1956. January 3, 1957 –
January 3, 1969
Democratic
Joseph S. Clark
24
27
Hugh Scott
Republican January 3, 1959 –
January 3, 1977
Elected in 1958. 30 86th Congress
87th Congress
88th Congress 30 Re-elected in 1962.

Lost re-election.
Re-elected in 1964. 31 89th Congress
90th Congress
91st Congress 31 Elected in 1968. January 3, 1969 –
January 3, 1981
Republican
Richard S. Schweiker
25
Re-elected in 1970.

Retired.
32 92nd Congress
93rd Congress
94th Congress 32 Re-elected in 1974.

Did not run for re-election.
28
John Heinz
Republican January 3, 1977 –
April 4, 1991
Elected in 1976. 33 95th Congress
96th Congress
97th Congress 33 Elected in 1980. January 3, 1981 –
January 3, 2011
Republican
Arlen Specter
26
Re-elected in 1982. 34 98th Congress
99th Congress
100th Congress 34 Re-elected in 1986.
Re-elected in 1988.

Died.
35 101st Congress
102nd Congress
Vacant April 4, 1991 –
May 9, 1991
 
29
Harris Wofford
Democratic May 9, 1991 –
January 3, 1995
Appointed to continue Heinz's term.

Elected to finish Heinz's term.

Lost re-election.
103rd Congress 35 Re-elected in 1992.
30
Rick Santorum
Republican January 3, 1995 –
January 3, 2007
Elected in 1994. 36 104th Congress
105th Congress
106th Congress 36 Re-elected in 1998.
Re-elected in 2000.

Lost re-election.
37 107th Congress
108th Congress
109th Congress 37 Re-elected in 2004.

Lost renomination.
31
Bob Casey, Jr.
Democratic January 3, 2007 –
Present
Elected in 2006. 38 110th Congress
111th Congress
Democratic
112th Congress 38 Elected in 2010. January 3, 2011 –
Present
Republican
Pat Toomey
27
Re-elected in 2012. 39 113th Congress
114th Congress
115th Congress 39 To be determined in the 2016 election.
To be determined in the 2018 election. 40 116th Congress
117th Congress
# Senator Party Years in office Electoral history T
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  T
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Electoral history Years in office Party Senator #
Class 1 Class 3

Living former U.S. Senators from Pennsylvania

As of August 2015, there are two former Senators from Pennsylvania who are living, both from Class 1.

Senator Term of office Class Date of birth (and age)
Harris Wofford 1991–1995 1 April 9, 1926
Rick Santorum 1995–2007 1 May 10, 1958

See also

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