History / Congress

U.S. Senate seat, Pennsylvania (class 1)

39 members have held this seat since Mar 4, 1789. Now: David McCormick R.

Holders
39
24 R · 9 D · 3 J · 2 F · 1 AA
Longest tenure
18 years
Robert P. Casey, Jr.
Current
21 months
David McCormick, since Jan 3, 2025
history/seat/pa-sen-1Every holder, newest first
+39
180018201840186018801900192019401960198020002020William Maclay · 1789-03-04 – 1791-03-04 · Anti-AdministrationJames Ross · 1794-01-01 – 1797-03-04 · FederalistJames Ross · 1797-05-15 – 1803-03-04 · FederalistSamuel Maclay · 1803-10-17 – 1809-03-04 · RepublicanMichael Leib · 1809-05-22 – 1815-03-04 · RepublicanJonathan Roberts · 1815-12-04 – 1821-03-04 · RepublicanWilliam Findlay · 1821-12-03 – 1827-03-04 · JacksonIsaac Dutton Barnard · 1827-12-03 – 1832-01-01 · JacksonSamuel McKean · 1833-12-02 – 1839-03-04 · DemocratDaniel Sturgeon · 1840-01-01 – 1845-03-04 · DemocratDaniel Sturgeon · 1845-12-01 – 1851-03-04 · DemocratRichard Brodhead · 1851-12-01 – 1857-03-04 · DemocratSimon Cameron · 1857-12-07 – 1862-01-01 · RepublicanCharles Rollin Buckalew · 1863-12-07 – 1869-03-04 · DemocratJohn Scott · 1869-03-04 – 1875-03-04 · RepublicanWilliam Andrew Wallace · 1875-12-06 – 1881-03-04 · DemocratJohn Inscho Mitchell · 1881-12-05 – 1887-03-04 · RepublicanMatthew Stanley Quay · 1887-12-05 – 1899-03-04 · RepublicanMatthew Stanley Quay · 1901-01-16 – 1904-05-29 · RepublicanPhilander Chase Knox · 1904-06-10 – 1909-03-05 · RepublicanGeorge Tener Oliver · 1909-03-15 – 1911-03-04 · RepublicanGeorge Tener Oliver · 1911-04-04 – 1917-03-04 · RepublicanPhilander Chase Knox · 1917-04-02 – 1921-10-13 · RepublicanWilliam Evans Crow · 1921-10-24 – 1922-08-03 · RepublicanDavid Aiken Reed · 1922-08-08 – 1923-03-04 · RepublicanDavid Aiken Reed · 1923-12-03 – 1929-03-04 · RepublicanDavid Aiken Reed · 1929-04-15 – 1935-01-04 · RepublicanEdward Martin · 1947-01-03 – 1959-01-04 · RepublicanHugh Doggett Scott Jr. · 1959-01-07 – 1971-01-04 · RepublicanHugh Doggett Scott Jr. · 1971-01-21 – 1977-01-04 · RepublicanHenry John Heinz III · 1977-01-04 – 1991-04-05 · RepublicanHarris Wofford · 1991-05-08 – 1995-01-04 · DemocratRichard J. Santorum · 1995-01-04 – 2007-01-04 · RepublicanRobert P. Casey, Jr. · 2007-01-04 – 2025-01-04 · DemocratJonathan Roberts · 1814-02-24 – 1815-03-04 · RepublicanGeorge Mifflin Dallas · 1831-12-05 – 1833-03-04 · JacksonDavid Wilmot · 1861-07-04 – 1863-03-04 · RepublicanJoseph F. Guffey · 1935-01-03 – 1947-01-04 · DemocratDavid McCormick · 2025-01-03 – present · Republican
David McCormick R
Jan 3, 2025 – present · 21 months
Robert P. Casey, Jr. D
Jan 4, 2007 – Jan 4, 2025 · 18 years
Richard J. Santorum R
Jan 4, 1995 – Jan 4, 2007 · 12 years
Harris Wofford D
May 8, 1991 – Jan 4, 1995 · 3.7 years
Henry John Heinz III R
Jan 4, 1977 – Apr 5, 1991 · 14 years
Hugh Doggett Scott Jr. R
Jan 21, 1971 – Jan 4, 1977 · 6 years
Hugh Doggett Scott Jr. R
Jan 7, 1959 – Jan 4, 1971 · 12 years
Edward Martin R
Jan 3, 1947 – Jan 4, 1959 · 12 years
Joseph F. Guffey D
Jan 3, 1935 – Jan 4, 1947 · 12 years
David Aiken Reed R
Apr 15, 1929 – Jan 4, 1935 · 5.7 years
David Aiken Reed R
Dec 3, 1923 – Mar 4, 1929 · 5.3 years
David Aiken Reed R
Aug 8, 1922 – Mar 4, 1923 · 7 months
William Evans Crow R
Oct 24, 1921 – Aug 3, 1922 · 9 months
Philander Chase Knox R
Apr 2, 1917 – Oct 13, 1921 · 4.5 years
George Tener Oliver R
Apr 4, 1911 – Mar 4, 1917 · 5.9 years
George Tener Oliver R
Mar 15, 1909 – Mar 4, 1911 · 2 years
Philander Chase Knox R
Jun 10, 1904 – Mar 5, 1909 · 4.7 years
Matthew Stanley Quay R
Jan 16, 1901 – May 29, 1904 · 3.4 years
Matthew Stanley Quay R
Dec 5, 1887 – Mar 4, 1899 · 11 years
John Inscho Mitchell R
Dec 5, 1881 – Mar 4, 1887 · 5.2 years
William Andrew Wallace D
Dec 6, 1875 – Mar 4, 1881 · 5.2 years
John Scott R
Mar 4, 1869 – Mar 4, 1875 · 6 years
Charles Rollin Buckalew D
Dec 7, 1863 – Mar 4, 1869 · 5.2 years
David Wilmot R
Jul 4, 1861 – Mar 4, 1863 · 20 months
Simon Cameron R
Dec 7, 1857 – Jan 1, 1862 · 4.1 years
Richard Brodhead D
Dec 1, 1851 – Mar 4, 1857 · 5.3 years
Daniel Sturgeon D
Dec 1, 1845 – Mar 4, 1851 · 5.3 years
Daniel Sturgeon D
Jan 1, 1840 – Mar 4, 1845 · 5.2 years
Samuel McKean D
Dec 2, 1833 – Mar 4, 1839 · 5.3 years
George Mifflin Dallas J
Dec 5, 1831 – Mar 4, 1833 · 15 months
Isaac Dutton Barnard J
Dec 3, 1827 – Jan 1, 1832 · 4.1 years
William Findlay J
Dec 3, 1821 – Mar 4, 1827 · 5.2 years
Jonathan Roberts R
Dec 4, 1815 – Mar 4, 1821 · 5.2 years
Jonathan Roberts R
Feb 24, 1814 – Mar 4, 1815 · 12 months
Michael Leib R
May 22, 1809 – Mar 4, 1815 · 5.8 years
Samuel Maclay R
Oct 17, 1803 – Mar 4, 1809 · 5.4 years
James Ross F
May 15, 1797 – Mar 4, 1803 · 5.8 years
James Ross F
Jan 1, 1794 – Mar 4, 1797 · 3.2 years
William Maclay AA
Mar 4, 1789 – Mar 4, 1791 · 2 years

Dates are from the @unitedstates congress-legislators project. Consecutive terms of one person are merged.