United States congressional delegations from Pennsylvania
 United States Senate
|Class 1 Senators||Congress||Class 3 Senators|
|William Maclay (Anti-Admin)||1st (1789–1791)||Robert Morris (Pro-Admin)|
|Albert Gallatin (D-R)||3rd (1793–1795)|
|James Ross (Pro-Admin)|
|4th (1795–1797)||William Bingham (F)|
|7th (1801–1803)||Peter Muhlenberg (D-R)|
|George Logan (D-R)|
|Samuel Maclay (D-R)||8th (1803–1805)|
|10th (1807–1809)||Andrew Gregg (D-R)|
|Michael Leib (D-R)|
|13th (1813–1815)||Abner Lacock (D-R)|
|Jonathan Roberts (D-R)|
|16th (1819–1821)||Walter Lowrie (D-R)|
|William Findlay (D-R)||17th (1821–1823)|
|19th (1825–1827)||William Marks (Adams)|
|Isaac D. Barnard (D-R)||20th (1827–1829)|
|22nd (1831–1833)||William Wilkins (D-R)|
|George M. Dallas (D-R)|
|Samuel McKean (D-R)||23rd (1833–1835)|
|James Buchanan (D-R)|
|Daniel Sturgeon (D)||26th (1839–1841)|
|Simon Cameron (D)|
|31st (1849–1851)||James Cooper (W)|
|Richard Brodhead (D)||32nd (1851–1853)|
|34th (1855–1857)||William Bigler (D)|
|Simon Cameron (R)||35th (1857–1859)|
|37th (1861–1863)||Edgar Cowan (R)|
|David Wilmot (R)|
|Charles R. Buckalew (D)||38th (1863–1865)|
|40th (1867–1869)||Simon Cameron (R)|
|John Scott (R)||41st (1869–1871)|
|William A. Wallace (D)||44th (1875–1877)|
|James Donald Cameron (R)|
|John I. Mitchell (R)||47th (1881–1883)|
|Matthew S. Quay (R)||50th (1887–1889)|
|55th (1897–1899)||Boies Penrose (R)|
|Matthew S. Quay (R)|
|Philander C. Knox (R)|
|George T. Oliver (R)||61st (1909–1911)|
|Philander C. Knox (R)||65th (1917–1919)|
|William E. Crow (R)||67th (1921–1923)|
|David A. Reed (R)||George Wharton Pepper (R)|
|70th (1927–1929)||William S. Vare (R)|
|Joseph R. Grundy (R)|
|James J. Davis (R)|
|Joseph F. Guffey (D)||74th (1935–1937)|
|79th (1945–1947)||Francis J. Myers (D)|
|Edward Martin (R)||80th (1947–1949)|
|82nd (1951–1953)||James H. Duff (R)|
|85th (1957–1959)||Joseph S. Clark (D)|
|Hugh D. Scott, Jr. (R)||86th (1959–1961)|
|91st (1969–1971)||Richard S. Schweiker (R)|
|H. John Heinz III (R)||95th (1977–1979)|
|97th (1981–1983)||Arlen Specter (R)|
|Harris Wofford (D)|
|Rick Santorum (R)||104th (1995–1997)|
|Bob Casey, Jr. (D)||110th (2007–2009)|
|111th (2009–2011)||Arlen Specter (D)|
|112th (2011–2013)||Pat Toomey (R)|
 United States House of Representatives
 1789–1793: 8 Seats
For the first two Congresses, Pennsylvania had eight seats. In the First Congress, Representatives were selected At-large on a general ticket. Districts were used in the Second Congress.
|Congress||State-wide at large on a General ticket|
|Thomas Fitzsimons (Pro-Admin)||Frederick Muhlenberg (Pro-Admin)||George Clymer (Pro-Admin)||Daniel Hiester (Anti-Admin)||Thomas Scott (Pro-Admin)||Peter Muhlenberg (Anti-Admin)||Thomas Hartley (Pro-Admin)||Henry Wynkoop (Pro-Admin)|
|Thomas Fitzsimons (Pro-Admin)||Frederick Muhlenberg (Anti-Admin)||Israel Jacobs (Pro-Admin)||Daniel Hiester (Anti-Admin)||John W. Kittera (Pro-Admin)||Andrew Gregg (Anti-Admin)||Thomas Hartley (Pro-Admin)||William Findley (Anti-Admin)|
 1793–1803: 13 Seats
Pennsylvania had thirteen seats. For the third Congress Representatives were selected At-large on a general ticket. After that, districts were created.
 1803–1813: 18 seats
There were eighteen seats, apportioned among eleven districts. Districts 1–3 each had three seats elected on a general ticket. District 4 had two such seats. Districts 5–11 each had one seat.
 1813–1823: 23 Seats
There were 15 districts. The 1st district had four seats elected on a general ticket. The 2nd, 3rd, 5th, 6th and 10th each had two seats elected on a general ticket. The rest of the districts each had one seat.
 1823–1833: 26 seats
 1833–1843: 28 seats
 1843–1853: 24 seats
 1853–1863: 25 seats
 1863–1873: 24 seats
 1873–1883: 27 seats
 1883–1893: 28 seats
Following the 1880 Census, the delegation grew by one seat. Until 1889, that seat was elected at-large state-wide. After 1889, the state was redistricted into 28 districts.
 1893–1903: 30 seats
Following the 1890 Census, the delegation grew by two seats. Those two additional seats were elected at-large across the entire commonwealth.
 1903–1913: 32 seats
Following the 1900 Census, the delegation grew by two seats.
 1913–1933: 36 seats
Following the 1910 Census, the delegation grew by four seats to its largest size to date. The four new seats were elected at-large state-wide. Starting in 1923, however, four new districts were added to replace the at-large seats.
 1933–1943: 34 seats
Following the 1930 Census, the delegation lost two seats.
 1943–1953: 33 seats
Following the 1940 Census, the delegation lost one seat. For the 78th Congress, there were 32 districts and 1 at-large seat. Starting with the 79th Congress, however, there were 33 districts.
 1953–1963: 30 seats
Following the 1950 Census, the delegation lost three seats.
 1963–1973: 27 seats
Following the 1960 Census, the delegation lost three seats.
 1973–1983: 25 seats
Following the 1970 Census, the delegation lost two seats.
 1983–1993: 23 seats
Following the 1980 Census, the delegation lost two seats.
|Thomas M. Foglietta (D)||William H. Gray (D)||Robert A. Borski, Jr. (D)||Joseph P. Kolter (D)||Richard T. Schulze (R)||Gus Yatron (D)||Robert W. Edgar (D)||Peter H. Kostmayer (D)||Bud Shuster (R)||Joseph M. McDade (R)||Frank G. Harrison (D)||John P. Murtha (D)||R. Lawrence Coughlin (R)||William J. Coyne (D)||Don Ritter (R)||Robert S. Walker (R)||George Gekas (R)||Doug Walgren (D)||William F. Goodling (R)||Joseph M. Gaydos (D)||Tom Ridge (R)||Austin J. Murphy (D)||William F. Clinger, Jr. (R)||98th
|Paul E. Kanjorski (D)||99th
|Curt Weldon (R)||100th
|Rick Santorum (R)||102nd
 1993–2003: 21 seats
Following the 1990 Census, the delegation lost two seats.
 2003–2013: 19 seats
Following the 2000 Census, the delegation lost two seats.
|Bob Brady (D)||Chaka Fattah (D)||Phil English (R)||Melissa Hart (R)||John E. Peterson (R)||Jim Gerlach (R)||Curt Weldon (R)||James C. Greenwood (R)||Bill Shuster (R)||Don Sherwood (R)||Paul E. Kanjorski (D)||John P. Murtha (D)||Joseph M. Hoeffel (D)||Michael F. Doyle (D)||Patrick J. Toomey (R)||Joseph R. Pitts (R)||Tim Holden (D)||Timothy Murphy (R)||Todd Platts (R)||108th
|Michael Fitzpatrick (R)||Allyson Schwartz (D)||Charles Dent (R)||109th
|Jason Altmire (D)||Joe Sestak (D)||Patrick Murphy (D)||Christopher Carney (D)||110th
|Kathy Dahlkemper (D)||Glenn Thompson (R)||111th
|Mark Critz (D)|
|Mike Kelly (R)||Pat Meehan (R)||Mike Fitzpatrick (R)||Tom Marino (R)||Lou Barletta (R)||112th
 2013–2023: 18 seats
Following the 2010 Census, the delegation lost one seat.
|Bob Brady (D)||Chaka Fattah (D)||Mike Kelly (R)||Scott Perry (R)||Glenn Thompson (R)||Jim Gerlach (R)||Pat Meehan (R)||Mike Fitzpatrick (R)||Bill Shuster (R)||Tom Marino (R)||Lou Barletta (R)||Keith Rothfus (R)||Allyson Schwartz (D)||Michael F. Doyle (D)||Charles Dent (R)||Joseph R. Pitts (R)||Matt Cartwright (D)||Timothy Murphy (R)||113th
 See also
- List of United States Senators from Pennsylvania
- List of United States Representatives from Pennsylvania