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
| 
 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  | 
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| 3 | ![]() James Ross  | 
Pro- Admin.  | 
Apr 24, 1794 – Mar 3, 1803  | 
Elected to finish the vacant term that happened from 1791 to 1793. | ||||||||
| 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  | 
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| 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  | 
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| 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 to finish Buchanan's term.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  | 
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| 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  | 
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| 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  | 
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| 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
- ↑ "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.
 - ↑ "U.S. Senate Election - 13 Dec 1808" (PDF). Wilkes University. Retrieved December 21, 2012.
 - ↑ "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.
 - ↑ Byrd, p. 159.
 - ↑ The World Almanac and Encyclopedia 1906. New York: The Press Publishing Co. New York World. 1905. p. 108.
 
References
- Byrd, Robert C. (October 1, 1993). Wolff, Wendy (ed.). The Senate, 1789-1989: Historical Statistics, 1789-1992. United States Senate Historical Office (volume 4 Bicentennial ed.). Washington, D.C.: U.S. Government Printing Office. ISBN 9780160632563.
 
See also
External links
- Members of Congress from Pennsylvania, govtrack.us
 - U.S. Senate members from Pennsylvania, civil.services
 




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