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.

Class 1

Class 1 U.S. Senators belong to the electoral cycle that were elected for one session of the U.S. Congress in the first election of 1788 and whose seats in recent years are contested in 1994, 2000, 2006, and 2012.

#	Senator	Party	Years	Congress	Term	Electoral history
1	William Maclay	Anti-Administration	March 4, 1789 – March 3, 1791	1	1	Elected in 1788 Lost re-election
Vacant			March 4, 1791 – December 1, 1793	2	2
				3
2	Albert Gallatin	Anti-Administration	December 2, 1793 – February 28, 1794			Elected in early 1793 Election voided on the grounds that he had not met 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	3 (Continued)		Elected to finish Gallatin's term
				4
				5	3	Re-elected in 1797 [Data unknown/missing. You can help!]
				6
				7
4	Samuel Maclay	Democratic- Republican	March 4, 1803 – January 4, 1809	8	4	Elected in 1802 Resigned, believing he would lose re-election
				9
				10
Vacant			January 4, 1809 – January 9, 1809
5	Michael Leib	Democratic- Republican	January 9, 1809 – February 14, 1814	10 (Continued)		Elected to finish Maclay's term
				11	5	Elected in 1808 Resigned to become Postmaster of Philadelphia
				12
				13
6	Jonathan Roberts	Democratic- Republican	February 24, 1814 – March 3, 1821			Elected to finish Leib's term
				14	6	Re-elected in late 1814 [Data unknown/missing. You can help!]
				15
				16
Vacant			March 4, 1821 – December 10, 1821	17	7	Legislature failed to elect
7	William Findlay	Democratic- Republican	December 10, 1821 – March 3, 1827			Elected late in 1821 Retired
		Jacksonian Republican		18
		Jacksonian		19
8	Isaac D. Barnard	Jacksonian	March 4, 1827 – December 6, 1831	20	8	Elected in 1826 Resigned to due ill health
				21
Vacant			December 6, 1831 – December 13, 1831
9	George Mifflin Dallas	Jacksonian	December 13, 1831 – March 3, 1833	21 (Continued)		Elected to finish Barnard's term Retired
				22
10	Samuel McKean	Jacksonian	March 4, 1833 – March 3, 1839	23	9	Elected in 1832 [Data unknown/missing. You can help!]
				24
				25
Vacant			March 4, 1839 – January 14, 1840	26	10	Legislature failed to elect
11	Daniel Sturgeon	Democratic	January 14, 1840 – March 3, 1851	26 (Continued)		Elected in early 1840
				27
				28
				29	11	Re-elected in early 1845
				30
				31
12	Richard Brodhead	Democratic	March 4, 1851 – March 3, 1857	32	12	Elected in 1851 [Data unknown/missing. You can help!]
				33
				34
13	Simon Cameron	Republican	March 4, 1857 – March 4, 1861	35	13	Elected in 1857 Resigned to become U.S. Secretary of War
				36
				37
Vacant			March 4, 1861 – March 14, 1861
14	David Wilmot	Republican	March 14, 1861 – March 3, 1863	37 (Continued)		Elected in 1861 to finish Cameron's term Retired
15	Charles R. Buckalew	Democratic	March 4, 1863 – March 3, 1869	38	14	Elected in 1863 [Data unknown/missing. You can help!]
				39
				40
16	John Scott	Republican	March 4, 1869 – March 3, 1875	41	15	Elected in 1869 Retired
				42
				43
17	William A. Wallace	Democratic	March 4, 1875 – March 3, 1881	44	16	Elected in early 1875 Lost re-election
				45
				46
18	John I. Mitchell	Republican	March 4, 1881 – March 3, 1887	47	17	Elected in early 1881 [Data unknown/missing. You can help!]
				48
				49
19	Matthew S. Quay	Republican	March 4, 1887 – March 3, 1899	50	18	Elected in early 1887
				51
				52
				53	19	Re-elected in early 1893 Legislature failed to re-elect
				54
				55
Vacant			March 4, 1899 – January 16, 1901	56	20	Quay was appointed to continue the term, but the Senate declared him not entitled to the seat
20	Matthew S. Quay	Republican	January 16, 1901 – May 28, 1904			Elected late in 1901 Died
				57
				58
21	Philander C. Knox	Republican	June 10, 1904 – March 4, 1909			Appointed to continue Quay's term Elected to finish Quay's term
				59	21	Re-elected in early 1905 Resigned to become U.S. Secretary of State
				60
				61
Vacant			March 4, 1909 – March 17, 1909
22	George T. Oliver	Republican	March 17, 1909 – March 3, 1917	61 (Continued)		Elected to finish Knox's term
				62	22	Re-elected in early 1911 Retired
				63
				64
23	Philander C. Knox	Republican	March 4, 1917 – October 12, 1921	65	23	Elected in 1916 Died
				66
				67
Vacant			October 12, 1921 – October 24, 1921
24	William E. Crow	Republican	October 24, 1921 – August 2, 1922			Appointed to continue Knox's term Died
Vacant			August 2, 1922 – August 8, 1922
25	David A. Reed	Republican	August 8, 1922 – January 3, 1935			Appointed to continue Knox's term Elected both to finish Knox's term and to the next term
				68	24	Elected in 1922
				69
				70
				71	25	Re-elected in 1928 Lost re-election
				72
				73
26	Joseph F. Guffey	Democratic	January 3, 1935 – January 3, 1947	74	26	Elected in 1934
				75
				76
				77	27	Re-elected in 1940 Lost re-election
				78
				79
27	Edward Martin	Republican	January 3, 1947 – January 3, 1959	80	28	Elected in 1946
				81
				82
				83	29	Re-elected in 1952 Retired
				84
				85
28	Hugh Scott	Republican	January 3, 1959 – January 3, 1977	86	30	Elected in 1958
				87
				88
				89	31	Re-elected in 1964
				90
				91
				92	32	Re-elected in 1970 Retired
				93
				94
29	John Heinz	Republican	January 3, 1977 – April 4, 1991	95	33	Elected in 1976
				96
				97
				98	34	Re-elected in 1982
				99
				100
				101	35	Re-elected in 1988 Died
				102
Vacant			April 4, 1991 – May 9, 1991
30	Harris Wofford	Democratic	May 9, 1991 – January 3, 1995	102 (Continued)		Appointed to continue Heinz's term Elected to finish Heinz's term Lost re-election
				103
31	Rick Santorum	Republican	January 3, 1995 – January 3, 2007	104	36	Elected in 1994
				105
				106
				107	37	Re-elected in 2000 Lost re-election
				108
				109
32	Bob Casey, Jr.	Democratic	January 3, 2007 – Present	110	38	Elected in 2006
				111
				112
				113	39	Re-elected in 2012
				114
				115
#	Senator	Party	Years	Congress	Term	Electoral history

Class 3

Class 3 U.S. Senators belong to the electoral cycle that were elected for three sessions of the U.S. Congress in the first election of 1788 and whose seats in recent years are contested in 1998, 2004, and 2010.

#	Senator	Party	Years	Congress	Term	Electoral history
1	Robert Morris	Pro- Administration	March 4, 1789 – March 3, 1795	1	1	Elected in 1789 [Data unknown/missing. You can help!]
				2
				3
2	William Bingham	Federalist	March 4, 1795 – March 3, 1801	4	2	Elected in 1795 [Data unknown/missing. You can help!]
				5
				6
3	J. Peter G. Muhlenberg	Democratic- Republican	March 4, 1801 – June 30, 1801	7	3	Elected in 1801 [Data unknown/missing. You can help!]
Vacant			June 30, 1801 – July 13, 1801
4	George Logan	Democratic- Republican	July 13, 1801 – March 3, 1807	7 (Continued)		[Data unknown/missing. You can help!]
				8
				9
5	Andrew Gregg	Democratic- Republican	March 4, 1807 – March 3, 1813	10	4	Elected in 1807 [Data unknown/missing. You can help!]
				11
				12
6	Abner Lacock	Democratic- Republican	March 4, 1813 – March 3, 1819	13	5	Elected in 1813 [Data unknown/missing. You can help!]
				14
				15
7	Walter Lowrie	Democratic- Republican	March 4, 1819 – March 3, 1825	16	6	Elected in 1819 [Data unknown/missing. You can help!]
				17
		Crawford Republican		18
8	William Marks	Anti-Jacksonian	March 4, 1825 – March 3, 1831	19	7	Elected in 1825 [Data unknown/missing. You can help!]
		Adams		20
		Anti-Jacksonian		21
9	William Wilkins	Jacksonian	March 4, 1831 – June 30, 1834	22	8	Elected in 1831 [Data unknown/missing. You can help!]
				23
Vacant			June 30, 1834 – December 6, 1834
10	James Buchanan	Democratic	December 6, 1834 – March 5, 1845	23 (Continued)		[Data unknown/missing. You can help!]
				24
				25	9	Re-elected in 1837
				26
				27
				28	10	Re-elected in 1843 [Data unknown/missing. You can help!]
				29
Vacant			March 5, 1845 – March 13, 1845
11	Simon Cameron	Democratic	March 13, 1845 – March 3, 1849	29 (Continued)		[Data unknown/missing. You can help!]
				30
12	James Cooper	Whig	March 4, 1849 – March 3, 1855	31	11	Elected in 1849 [Data unknown/missing. You can help!]
				32
				33
Vacant			March 4, 1855 – January 14, 1856	34	12	[Data unknown/missing. You can help!]
13	William Bigler	Democratic	January 14, 1856 – March 3, 1861	34 (Continued)		Elected late in 1856 [Data unknown/missing. You can help!]
				35
				36
14	Edgar Cowan	Republican	March 4, 1861 – March 3, 1867	37	13	Elected in 1860 [Data unknown/missing. You can help!]
				38
				39
15	Simon Cameron	Republican	March 4, 1867 – March 12, 1877	40	14	Elected in 1866
				41
				42
				43	15	Re-elected in 1872 [Data unknown/missing. You can help!]
				44
				45
Vacant			March 12, 1877 – March 20, 1877
16	J. Donald Cameron	Republican	March 20, 1877 – March 3, 1897	45 (Continued)		[Data unknown/missing. You can help!]
				46	16	[Data unknown/missing. You can help!]
				47
				48
				49	17	Re-elected in 1884
				50
				51
				52	18	Re-elected in 1890 [Data unknown/missing. You can help!]
				53
				54
17	Boies Penrose	Republican	March 4, 1897 – December 31, 1921	55	19	Elected in 1896
				56
				57
				58	20	Re-elected in 1902
				59
				60
				61	21	Re-elected in 1908
				62
				63
				64	22	Re-elected in 1914
				65
				66
				67	23	Re-elected in 1920 [Data unknown/missing. You can help!]
Vacant			December 31, 1921 – January 9, 1922
18	George Wharton Pepper	Republican	January 9, 1922 – March 3, 1927	67 (Continued)		Appointed to continue Penrose's term Elected to finish Penrose's term Lost renomination
				68
				69
19	William S. Vare	Republican	March 4, 1927 – December 6, 1929	70	24	Elected in 1926 Senate refused to seat due to allegations of corruption surrounding the election
				71
Vacant			December 6, 1929 – December 11, 1929
20	Joseph R. Grundy	Republican	December 11, 1929 – December 1, 1930			Appointed to continue Vare's term Lost nomination to finish Vare's term
21	James J. Davis	Republican	December 2, 1930 – January 3, 1945	71 (Continued)		Elected to finish Vare's term
				72
				73	25	Re-elected in 1932
				74
				75
				76	26	Re-elected in 1938 [Data unknown/missing. You can help!]
				77
				78
22	Francis J. Myers	Democratic	January 3, 1945 – January 3, 1951	79	27	Elected in 1944 [Data unknown/missing. You can help!]
				80
				81
23	James H. Duff	Republican	January 3, 1951 – January 3, 1957	82	28	Elected in 1950 [Data unknown/missing. You can help!]
				83
				84
24	Joseph S. Clark	Democratic	January 3, 1957 – January 3, 1969	85	29	Elected in 1956
				86
				87
				88	30	Re-elected in 1962 Lost re-election
				89
				90
25	Richard S. Schweiker	Republican	January 3, 1969 – January 3, 1981	91	31	Elected in 1968
				92
				93
				94	32	Re-elected in 1974 Did not run for re-election
				95
				96
26	Arlen Specter	Republican	January 3, 1981 – January 3, 2011	97	33	Elected in 1980
				98
				99
				100	34	Re-elected in 1986
				101
				102
				103	35	Re-elected in 1992
				104
				105
				106	36	Re-elected in 1998
				107
				108
				109	37	Re-elected in 2004 Lost renomination
				110
				111
		Democratic		111 (Continued)
27	Pat Toomey	Republican	January 3, 2011 – Present	112	38	Elected in 2010
				113
				114
#	Senator	Party	Years	Congress	Term	Electoral history

See also

• United States congressional delegations from Pennsylvania
• List of United States Representatives from Pennsylvania