List of United States senators from Pennsylvania

Current delegation

117px

Bob Casey Jr. (D)

117px

Pat Toomey (R)

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 Democrat Bob Casey Jr. (since 2007) and Republican Pat Toomey (since 2011), making it one of seven states to have a split United States Senate delegation. Arlen Specter was Pennsylvania's longest-serving senator (1981–2011).

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 1998, 2004, 2010, and 2016. The next election will be in 2022.
#	Senator	Party	Dates in office	Electoral history	T		T	Electoral history	Dates in office	Party	Senator	#
1	William Maclay	Anti-Admin.	March 4, 1789 – March 3, 1791	Elected in 1788. Lost re-election.	1	1st	1	Elected in 1788. Retired.	March 4, 1789 – March 3, 1795	Pro- Admin.	Robert Morris	1
Vacant			March 4, 1791 – December 1, 1793	Legislature failed to elect due to a disagreement on election procedure.	2	2nd
2	Albert Gallatin	Anti-Admin.	December 2, 1793 – February 28, 1794	Elected to finish the vacant term. Election voided for failure to meet the residency requirements for eligibility to the office.
						3rd
Vacant			March 1, 1794 – April 23, 1794
3	James Ross	Pro- Admin.	April 24, 1794 – March 3, 1803	Elected to finish Gallatin's term.
		Federalist				4th	2	Elected in 1795. Retired.	March 4, 1795 – March 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.	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
						9th
						10th	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 January 9, 1809 to finish Maclay's term, having already won election to the next term.
				Elected on December 13, 1808. Resigned to become Postmaster of Philadelphia.	5	11th
						12th
						13th	5	Elected on December 8, 1812. Retired.	March 4, 1813 – March 3, 1819	Democratic- Republican	Abner Lacock	6
Vacant			February 14, 1814 – February 24, 1814
6	Jonathan Roberts	Democratic- Republican	February 24, 1814 – March 3, 1821	Elected to finish Leib's term.
				Re-elected in late 1814.	6	14th
						15th
						16th	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
7	William Findlay	Democratic- Republican	December 10, 1821 – March 3, 1827	Elected late in 1821. Retired.
						18th
		Jacksonian				19th	7	Elected in 1825. Lost re-election.	March 4, 1825 – March 3, 1831	National Republican	William Marks	8
8	Isaac D. Barnard	Jacksonian	March 4, 1827 – December 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.	March 4, 1831 – June 30, 1834	Jacksonian	William Wilkins	9
Vacant			December 6, 1831 – December 13, 1831
9	George M. 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
10	Samuel McKean	Jacksonian	December 7, 1833 – March 3, 1839	Elected late in 1833.
									June 30, 1834 – December 6, 1834	Vacant
								Elected to finish Wilkins's term.	December 6, 1834 – March 5, 1845	Jacksonian	James Buchanan	10
						24th
		Democratic				25th	9	Re-elected in 1836.		Democratic
Vacant			March 4, 1839 – January 14, 1840	Legislature failed to elect.	10	26th
11	Daniel Sturgeon	Democratic	January 14, 1840 – March 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
									March 5, 1845 – March 13, 1845	Vacant
								Elected in 1845. Retired.	March 13, 1845 – March 3, 1849	Democratic	100px Simon Cameron	11
						30th
						31st	11	Elected in 1849.	March 4, 1849 – March 3, 1855	Whig	James Cooper	12
12	100px Richard Brodhead	Democratic	March 4, 1851 – March 3, 1857	Elected in 1851.	12	32nd
						33rd
						34th	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	100px Simon Cameron	Republican	March 4, 1857 – March 3, 1861	Elected in 1857. Resigned to become U.S. Secretary of War.	13	35th
						36th
Vacant			March 4, 1861 – March 14, 1861			37th	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.	14	38th
						39th
						40th	14	Elected in 1867.	March 4, 1867 – March 12, 1877	Republican	100px Simon Cameron	15
16	John Scott	Republican	March 4, 1869 – March 3, 1875	Elected in 1869. Retired.	15	41st
						42nd
						43rd	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
						45th
									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	16	Re-elected in 1879.
18	John I. Mitchell	Republican	March 4, 1881 – March 3, 1887	Elected in early 1881.	17	47th
						48th
						49th	17	Re-elected in 1885.
19	Matthew S. Quay	Republican	March 4, 1887 – March 3, 1899	Elected in early 1887.	18	50th
						51st
						52nd	18	Re-elected in 1891. Retired.
				Re-elected January 17, 1893. Legislature failed to re-elect.	19	53rd
						54th
						55th	19	Elected January 19, 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
	Matthew S. Quay	Republican	January 16, 1901 – May 28, 1904	Elected late in 1901. Died.
						57th
						58th	20	Re-elected on January 20, 1903.
20	Philander C. Knox	Republican	June 10, 1904 – March 3, 1909	Appointed to continue Quay's term. Elected on January 17, 1905 to finish Quay's term.
				Re-elected on January 18, 1905. Resigned to become U.S. Secretary of State.	21	59th
						60th
Vacant			March 4, 1909 – March 17, 1909			61st	21	Re-elected January 19, 1909.
21	George T. Oliver	Republican	March 17, 1909 – March 3, 1917	Elected to finish Knox's term
				Re-elected January 11, 1911. Retired.	22	62nd
						63rd
						64th	22	Re-elected in 1914.
22	Philander C. Knox	Republican	March 4, 1917 – October 12, 1921	Elected in 1916. Died.	23	65th
						66th
						67th	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
						69th
						70th	24	William S. Vare (R) was elected in 1926, but the Governor refused to certify the election and the Senate refused to qualify him. He was formally unseated December 9, 1929.	March 4, 1927 – December 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.	December 11, 1929 – December 1, 1930	Republican	Joseph R. Grundy	19
								Elected November 4, 1930 to finish Vare's term	December 2, 1930 – January 3, 1945	Republican	James J. Davis	20
						72nd
						73rd	25	Re-elected in 1932.
25	Joseph F. Guffey	Democratic	January 3, 1935 – January 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.	January 3, 1945 – January 3, 1951	Democratic	Francis J. Myers	21
26	Edward Martin	Republican	January 3, 1947 – January 3, 1959	Elected in 1946.	28	80th
						81st
						82nd	28	Elected in 1950. Lost re-election.	January 3, 1951 – January 3, 1957	Republican	100px James H. Duff	22
				Re-elected in 1952. Retired.	29	83rd
						84th
						85th	29	Elected in 1956.	January 3, 1957 – January 3, 1969	Democratic	Joseph S. Clark	23
27	Hugh Scott	Republican	January 3, 1959 – January 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.	January 3, 1969 – January 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	January 3, 1977 – April 4, 1991	Elected in 1976.	33	95th
						96th
						97th	33	Elected in 1980.	January 3, 1981 – April 28, 2009	Republican	Error creating thumbnail: File missing 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			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	35	Re-elected in 1992.
30	Rick Santorum	Republican	January 3, 1995 – January 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. Lost renomination.
31	100px Bob Casey Jr.	Democratic	January 3, 2007 – Present	Elected in 2006.	38	110th
						111th
									April 28, 2009 – January 3, 2011	Democratic
						112th	38	Elected in 2010.	January 3, 2011 – Present	Republican	Pat Toomey	26
				Re-elected in 2012.	39	113th
						114th
						115th	39	Re-elected in 2016. Retiring at end of term.
				Re-elected in 2018.	40	116th
						117th
						118th	41	To be determined in the 2022 election.
To be determined in the 2024 election.					41	119th
#	Senator	Party	Years in office	Electoral history	T		T	Electoral history	Years in office	Party	Senator	#
Class 1							Class 3

Living former senators

As of March 2022, there is one living former U.S. senator from Pennsylvania. The most recent senator to die was Harris Wofford (served 1991–1995) on January 21, 2019. The most recently serving senator to die was Arlen Specter (served 1981–2011) on October 14, 2012.

Senator	Term of office	Date of birth (and age)
Rick Santorum	1995–2007	(1958-05-10) May 10, 1958

Superlatives

Longest service

Senator	First served	Last served	Length of service
Arlen Specter	January 3, 1981	January 3, 2011	( days)
Boies Penrose	March 4, 1897	December 21, 1921	( days)
J. Donald Cameron	March 20, 1877	March 3, 1897	( days)
Hugh Scott	January 3, 1959	January 3, 1977	( days)
Simon Cameron	March 13, 1845	March 3, 1849	Combined total: 17 years, 363 days (6,573 days)
	March 4, 1857	March 3, 1861
	March 4, 1867	March 12, 1877

Shortest service

Senator	First served	Last served	Length of service
Albert Gallatin	December 2, 1793	February 28, 1794	( days)
Peter Muhlenberg	March 4, 1801	June 30, 1801	( days)
William E. Crow	October 24, 1921	August 2, 1922	( days)
Joseph R. Grundy	December 11, 1929	December 1, 1930	( days)
George M. Dallas	December 13, 1831	March 3, 1833	( days)

Youngest at beginning of service

Senator	Date of birth	First served	Age
James Ross	July 12, 1762	April 24, 1794
Albert Gallatin	January 19, 1761	December 2, 1793
Walter Lowrie	December 10, 1784	March 4, 1819
Isaac D. Barnard	July 18, 1791	March 4, 1827
Boies Penrose	November 1, 1860	March 4, 1897

Oldest at end of service

Senator	Date of birth	Last served	Age
Arlen Specter	February 12, 1930	January 3, 2011
Edward Martin	September 18, 1879	January 3, 1959
Simon Cameron	March 8, 1799	March 12, 1877
Hugh Scott	November 11, 1900	January 3, 1977
Joseph F. Guffey	December 29, 1870	January 3, 1947

See also

• List of United States Senate elections in Pennsylvania
• United States congressional delegations from Pennsylvania
• List of United States representatives from Pennsylvania

External links

• Members of Congress from Pennsylvania, govtrack.us
• U.S. Senate members from Pennsylvania, civil.services