Pennsylvania's 12th congressional district

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Pennsylvania's 12th congressional district
Pennsylvania's 12th congressional district
Pennsylvania's 12th congressional district
Interactive map of district boundaries (Allegheny County highlighted in red)
  Summer Lee
Population (2021)684,344
Median household
Cook PVI D+8 [1]

Pennsylvania's 12th congressional district is located in southwestern Pennsylvania, which includes Pittsburgh and much of Allegheny County. It has been represented since January 3, 2023 by Summer Lee.


Prior to 2018, the 12th district was located in southwestern Pennsylvania, and included all of Beaver County, and parts of Allegheny, Cambria, Lawrence, Somerset, and Westmoreland Counties. The Supreme Court of Pennsylvania redrew this and other state congressional districts in February 2018 after ruling the previous map unconstitutional due to partisan gerrymandering. The new 12th district covers much of the old 10th district. The old 12th district was redrawn to an area north and west of Pittsburgh and renamed the 17th district, for the 2018 elections and representation thereafter. [2]

Before the 2011 round of redistricting, the 12th district was widely considered to be gerrymandered by the Republican-controlled state legislature as a heavily Democratic district. It consisted of all of Greene County, and parts of Allegheny, Armstrong, Cambria, Fayette, Indiana, Somerset, Washington, and Westmoreland Counties.

Geography 2003–2013

Located in southwestern Pennsylvania, the 12th district consisted of all of Greene County, and parts of Allegheny, Armstrong, Cambria, Fayette, Indiana, Somerset, Washington, and Westmoreland Counties. A thoroughly unionized district, the 12th was historically among the most Democratic areas of the state. However, the Democrats in this area were not as liberal as their counterparts in Philadelphia and Pittsburgh. Most were somewhat conservative on social issues, particularly abortion and gun control.

The 12th included all of Greene County, a highly rural region that still has a traditionally Democratic influence due to its labor leanings. In Washington county, the city of Washington, a large and Democratic edge suburb of Pittsburgh was a part of the 12th, as well as the eastern portion of the county. Most of the Monongahela Valley region, a very Democratic area that was once an important steel-making area, was also part of the 12th. However, more rural western Washington County and the suburban northern portion of the county (with towns like McDonald and Canonsburg) then belonged to the 18th. The western portion of Fayette County, including the city of Uniontown, a labor Democratic stronghold was part of this district, while the rural mountainous eastern portion was a part of the 9th.

The 12th district continued eastward, including southeastern and northeastern parts of Westmoreland County, including the labor Democratic city of Latrobe, while leaving the suburban western part of the county (with towns such as Murrysville) and the generally left-leaning city of Greensburg in the 18th. The major population base of the district was located just to the east, taking in most of Somerset and Cambria counties. This area, the heart of a large coal-mining region, includes the district's largest city, Johnstown. The 12th also contained a part of Indiana County, mainly the college town of Indiana.

The 12th completed its wrap around the metro Pittsburgh region by ending in the northeastern corner of the city's suburbs, containing middle class regions such as Lower Burrell and the working class suburb of New Kensington. A portion of Armstrong County was also included in the district, including several industrial suburbs such as Freeport and Apollo.



After the 2000 census, the Republican-controlled state legislature radically altered the 12th in an effort to get more Republicans elected from traditionally heavily Democratic southwestern Pennsylvania. A large chunk of the old 20th district was incorporated into the 12th. In some parts of the western portion of the district, one side of the street is in the 12th while the other side of the street is in the 18th district (the reconfigured 20th). This led to criticism that the 12th was a gerrymander intended to pack as many of southwestern Pennsylvania's heavily Democratic areas as possible into just two districts—the 12th and the Pittsburgh-based 14th .

Prior to the 2012 redistricting, the district has a Cook Partisan Voting Index score of R+1. The district is notable as the only congressional district in the nation that voted for Democratic presidential candidate John Kerry in 2004 but went for Republican John McCain in 2008. This is mainly due to the fact that since 2000 Southwestern Pennsylvania has gradually become more Republican leaning.

2006 election

In the 2006 election, Murtha was re-elected with 61% of the vote. His Republican opponent, Washington County Commissioner Diana Irey, received 39%.

2008 election

John Murtha won the 2008 election with 58% of the vote. Murtha was a United States Marine and the first Vietnam War veteran to serve in Congress. He defeated Lt. Col. William T. Russell, an army veteran.

2010 special election

Pennsylvania governor Ed Rendell scheduled a special election for May 18, 2010, following the death of Representative John Murtha. On March 8, 2010, the Pennsylvania Democratic Party's Executive Committee nominated Mark Critz, Murtha's former district director. [3] On March 11, a convention of Republicans from the 12th district nominated businessman Tim Burns. [4] The Libertarian Party's candidate was Demo Agoris, who ran for the Pennsylvania House of Representatives in the 48th district as a Libertarian in 2006.

Mark Critz won the election.

2010 election

Mark Critz was re-elected in the regularly scheduled 2010 election; again beating Republican Tim Burns (this time with 51% of the vote against 49%).

2012 election

Mark Critz ran for re-election to a second full term in the 2012 election, but was defeated by Republican challenger Keith Rothfus. Critz garnered 48.5% of the vote to Rothfus' 51.5%. [5] The 12th had absorbed a large chunk of the old 4th district, including Rothfus' home, after the 2010 census, and was significantly more Republican than its predecessor.

2019 special election

After Tom Marino's resignation in January 2019, an election was held on May 21 to fill the open seat. Republican Fred Keller defeated 2018 Democratic nominee Mark Friedenberg. [6] [7]

List of members representing the district

Electoral historyLocation
District created on March 4, 1795
Albert Gallatin
Democratic-Republican March 4, 1795 –
May 14, 1801
Elected in 1794.
Re-elected in 1796.
Re-elected in 1798.
Re-elected in 1800 but declined the seat to become U.S. Secretary of the Treasury.
[ data unknown/missing ]
VacantMay 14, 1801 –
December 7, 1801
William Hoge Democratic-Republican December 7, 1801 –
March 3, 1803
Elected October 13, 1801 to finish Gallatin's term and seated December 7, 1801.
Redistricted to the 10th district .
District not in useMarch 3, 1803 –
March 4, 1813
Aaron Lyle Democratic-Republican March 4, 1813 –
March 3, 1817
Redistricted from the 10th district and re-elected in 1812.
Re-elected in 1814.
[ data unknown/missing ]
Thomas Patterson Democratic-Republican March 4, 1817 –
March 3, 1823
Elected in 1816.
Re-elected in 1818.
Re-elected in 1820.
Redistricted to the 15th district .
John Brown Democratic-Republican March 4, 1823 –
March 3, 1825
18th Redistricted from the 9th district and re-elected in 1822.
Lost re-election.
[ data unknown/missing ]
John Mitchell Jacksonian March 4, 1825 –
March 3, 1829
Elected in 1824.
Re-elected in 1826.
John scott.jpg
John Scott
Jacksonian March 4, 1829 –
March 3, 1831
21st Elected in 1828.
Lost re-election.
Robert Allison Anti-Masonic March 4, 1831 –
March 3, 1833
22nd Elected in 1830.
George Chambers Anti-Masonic March 4, 1833 –
March 3, 1837
Elected in 1832.
Re-elected in 1834.
[ data unknown/missing ]
[ data unknown/missing ]
Daniel Sheffer Democratic March 4, 1837 –
March 3, 1839
25th Elected in 1836.
Lost re-election.
James Cooper
Whig March 4, 1839 –
March 3, 1843
Elected in 1838.
Re-elected in 1840.
[ data unknown/missing ]
Almon H. Read Democratic March 4, 1843 –
June 3, 1844
28th Redistricted from the 17th district and re-elected in 1842.
[ data unknown/missing ]
VacantJune 3, 1844 –
December 2, 1844
George Fuller Democratic December 2, 1844 –
March 3, 1845
Elected to finish Read's term.
[ data unknown/missing ]
David Wilmot.png
David Wilmot
Democratic March 4, 1845 –
March 3, 1851
Elected in 1844.
Re-elected in 1846.
Re-elected in 1848.
Galusha A. Grow restored.jpg
Galusha A. Grow
Democratic March 4, 1851 –
March 3, 1853
32nd Elected in 1850.
Redistricted to the 14th district .
Hendrick B. Wright
Democratic March 4, 1853 –
March 3, 1855
33rd Elected in 1852.
Lost re-election.
[ data unknown/missing ]
Henry M. Fuller (Pennsylvania Congressman).jpg
Henry M. Fuller
Opposition March 4, 1855 –
March 3, 1857
34th Elected in 1854.
John G. Montgomery Democratic March 4, 1857 –
April 24, 1857
35th Elected in 1856.
VacantApril 24, 1857 –
December 7, 1857
Paul Leidy
Democratic December 7, 1857 –
March 3, 1859
Elected to finish Montgomery's term.
[ data unknown/missing ]
George W. Scranton (Pennsylvania Congressman).jpg
George W. Scranton
Republican March 4, 1859 –
March 24, 1861
Elected in 1858.
Re-elected in 1860.
VacantMarch 24, 1861 –
July 4, 1861
Hendrick B. Wright
Democratic July 4, 1861 –
March 3, 1863
Elected to finish Scranton's term.
[ data unknown/missing ]
Charles Denison
Democratic March 4, 1863 –
June 27, 1867
Elected in 1862.
Re-elected in 1864.
Re-elected in 1866.
[ data unknown/missing ]
VacantJune 27, 1867 –
November 21, 1867
George Washington Woodward - Brady-Handy.jpg
George W. Woodward
Democratic November 21, 1867 –
March 3, 1871
Elected to finish Denison's term.
Re-elected in 1868.
Lazarus D. Shoemaker (Pennsylvania Congressman).jpg
Lazarus D. Shoemaker
Republican March 4, 1871 –
March 3, 1875
Elected in 1870.
Re-elected in 1872.
[ data unknown/missing ]
Winthrop Welles Ketchum - Brady-Handy adjusted.jpg
Winthrop W. Ketcham
Republican March 4, 1875 –
July 19, 1876
44th Elected in 1874.
Resigned to become U.S. District Judge
VacantJuly 19, 1876 –
November 7, 1876
William Henry Stanton 2.jpg
William H. Stanton
Democratic November 7, 1876 –
March 3, 1877
Elected to finish Ketcham's term.
Hendrick B. Wright
Democratic March 4, 1877 –
March 3, 1879
Elected in 1876.
Re-elected in 1878.
Lost re-election.
Greenback March 4, 1879 –
March 3, 1881
Joseph A. Scranton (Pennsylvania Congressman).jpg
Joseph A. Scranton
Republican March 4, 1881 –
March 3, 1883
47th Elected in 1880.
Lost re-election.
Daniel W. Connolly (Pennsylvania Congressman).jpg
Daniel W. Connolly
Democratic March 4, 1883 –
March 3, 1885
48th Elected in 1882.
Lost re-election.
[ data unknown/missing ]
Joseph A. Scranton (Pennsylvania Congressman).jpg
Joseph A. Scranton
Republican March 4, 1885 –
March 3, 1887
49th Elected in 1884.
Lost re-election.
John Lynch (1843-1910), Pennsylvania Congressman.jpg
John Lynch
Democratic March 4, 1887 –
March 3, 1889
50th Elected in 1886.
Lost re-election.
Edwin S. Osborne (Pennsylvania Congressman).jpg
Edwin S. Osborne
Republican March 4, 1889 –
March 3, 1891
51st Redistricted from the at-large district and re-elected in 1888.
George W. Shonk (Pennsylvania Congressman).jpg
George W. Shonk
Republican March 4, 1891 –
March 3, 1893
52nd Elected in 1890.
William H. Hines (Pennsylvania Congressman).jpg
William H. Hines
Democratic March 4, 1893 –
March 3, 1895
53rd Elected in 1892.
Lost re-election.
[ data unknown/missing ]
John Leisenring (Pennsylvania Congressman).jpg
John Leisenring
Republican March 4, 1895 –
March 3, 1897
54th Elected in 1894.
Morgan B. Williams (Pennsylvania Congressman).jpg
Morgan B. Williams
Republican March 4, 1897 –
March 3, 1899
55th Elected in 1896.
Lost re-election.
Stanley W. Davenport (cropped).jpg
Stanley W. Davenport
Democratic March 4, 1899 –
March 3, 1901
56th Elected in 1898.
Lost renomination.
Henry W. Palmer.jpg
Henry W. Palmer
Republican March 4, 1901 –
March 3, 1903
57th Elected in 1900.
Redistricted to the 11th district .
George R. Patterson (Pennsylvania Congressman).jpg
George R. Patterson
Republican March 4, 1903 –
March 21, 1906
Elected in 1902.
Re-elected in 1904.
[ data unknown/missing ]
VacantJanuary 21, 1906 –
November 6, 1906
Charles N. Brumm, Pennsylvania Congressman.jpg
Charles N. Brumm
Republican November 6, 1906 –
January 4, 1909
Elected to finish Patterson's term.
Re-elected in 1906.
Retired to run for judge of the court of common pleas of Schuylkill County, Pennsylvania and then resigned once elected.
VacantJanuary 4, 1909 –
March 3, 1909
Alfred B. Garner (Pennsylvania Congressman).jpg
Alfred B. Garner
Republican March 4, 1909 –
March 3, 1911
61st Elected in 1908.
Lost renomination.
Robert Emmett Lee (Pennsylvania Congressman).jpg
Robert E. Lee
Democratic March 4, 1911 –
March 3, 1915
Elected in 1910.
Re-elected in 1912.
Lost re-election.
[ data unknown/missing ]
Robert D. Heaton (Pennsylvania Congressman).jpg
Robert D. Heaton
Republican March 4, 1915 –
March 3, 1919
Elected in 1914.
Re-elected in 1916.
John Reber
Republican March 4, 1919 –
March 3, 1923
Elected in 1918.
Re-elected in 1920.
JohnJosephCasey (cropped).jpg
John J. Casey
Democratic March 4, 1923 –
March 3, 1925
68th Elected in 1922.
Lost re-election.
Edmund N. Carpenter (Pennsylvania Congressman).jpg
Edmund N. Carpenter
Republican March 4, 1925 –
March 3, 1927
69th Elected in 1924.
Lost re-election.
JohnJosephCasey (cropped).jpg
John J. Casey
Democratic March 4, 1927 –
May 5, 1929
Elected in 1926.
Re-elected in 1928.
VacantMay 5, 1929 –
June 4, 1929
C. Murray Turpin (Pennsylvania Congressman).jpg
C. Murray Turpin
Republican June 4, 1929 –
January 3, 1937
Elected to finish Casey's term.
Re-elected in 1930.
Re-elected in 1932.
Re-elected in 1934.
Lost re-election.
[ data unknown/missing ]
J. Harold Flannery (Pennsylvania Congressman).jpg
J. Harold Flannery
Democratic January 3, 1937 –
January 3, 1942
Elected in 1936.
Re-elected in 1938.
Re-elected in 1940.
Resigned to become judge of the common pleas court of Luzerne County, Pennsylvania.
VacantJanuary 3, 1942 –
May 19, 1942
Thomas Byron Miller (Pennsylvania Congressman).jpg
Thomas B. Miller
Republican May 19, 1942 –
January 3, 1945
Elected to finish Flannery's term.
Re-elected later in 1942.
Lost re-election.
[ data unknown/missing ]
Ivor D. Fenton
Republican January 3, 1945 –
January 3, 1963
Redistricted from the 13th district and re-elected in 1944.
Re-elected in 1946.
Re-elected in 1948.
Re-elected in 1950.
Re-elected in 1952.
Re-elected in 1954.
Re-elected in 1956.
Re-elected in 1958.
Re-elected in 1960.
Lost re-election.
[ data unknown/missing ]
J. Irving Whalley.jpg
J. Irving Whalley
Republican January 3, 1963 –
January 3, 1973
Redistricted from the 18th district and re-elected in 1962.
Re-elected in 1964.
Re-elected in 1966.
Re-elected in 1968.
Re-elected in 1970.
[ data unknown/missing ]
John P. Saylor 89th Congress 1965.jpg
John P. Saylor
Republican January 3, 1973 –
October 28, 1973
93rd Redistricted from the 22nd district and re-elected in 1972.
[ data unknown/missing ]
VacantOctober 28, 1973 –
February 5, 1974
John Murtha portrait 2008.jpg
John Murtha
Democratic February 5, 1974 –
February 8, 2010
Elected to finish Saylor's term.
Re-elected later in 1974.
Re-elected in 1976.
Re-elected in 1978.
Re-elected in 1980.
Re-elected in 1982.
Re-elected in 1984.
Re-elected in 1986.
Re-elected in 1988.
Re-elected in 1990.
Re-elected in 1992.
Re-elected in 1994.
Re-elected in 1996.
Re-elected in 1998.
Re-elected in 2000.
Re-elected in 2002.
Re-elected in 2004.
Re-elected in 2006.
Re-elected in 2008.
[ data unknown/missing ]
[ data unknown/missing ]
Pa12 109.gif
VacantFebruary 8, 2010 –
May 18, 2010
Mark Critz
Democratic May 18, 2010 –
January 3, 2013
Elected to finish Murtha's term.
Re-elected later in 2010.
Lost re-election.
Keith Rothfus.png
Keith Rothfus
Republican January 3, 2013 –
January 3, 2019
Elected in 2012.
Re-elected in 2014.
Re-elected in 2016.
Redistricted to the 17th district and lost re-election.
Pennsylvania US Congressional District 12 (since 2013).tif
Tom Marino Official Portrait, 112th Congress (cropped 2).jpg
Tom Marino
Republican January 3, 2019 –
January 23, 2019
116th Redistricted from the 10th district and re-elected in 2018.
Resigned. [8]
Pennsylvania Congressional District 12.png
VacantJanuary 23, 2019 –
May 21, 2019
Fred Keller, official portrait, 116th Congress.jpg
Fred Keller
Republican May 21, 2019 –
January 3, 2023
Elected to finish Marino's term.
Re-elected in 2020.
Redistricted to the 9th district and retired at the end of term.
Rep. Summer Lee - 118th Congress.jpg
Summer Lee
Democratic January 3, 2023 –
118th Elected in 2022.2023–
Pennsylvania's 12th congressional district

Recent election results


Pennsylvania's 12th congressional district, 2012 [9]
Republican Keith Rothfus 175,352 51.7
Democratic Mark Critz (incumbent)163,58948.3
Total votes338,941 100.0
Republican gain from Democratic


Pennsylvania's 12th congressional district, 2014 [10]
Republican Keith Rothfus (incumbent) 127,993 59.3
Democratic Erin McClelland87,92840.7
Total votes215,921 100.0
Republican hold


Pennsylvania's 12th congressional district, 2016 [11]
Republican Keith Rothfus (incumbent) 221,851 61.8
Democratic Erin Mcclelland137,35338.2
Total votes359,204 100.0
Republican hold


Pennsylvania's 12th congressional district, 2018 [12]
Republican Tom Marino (incumbent) 161,047 66.0
Democratic Marc Friedenburg82,82534.0
Total votes243,872 100.0
Republican hold

2019 special election

Pennsylvania's 12th congressional district special election, 2019 [13]
Republican Fred Keller 90,000 68.08% +2.04%
Democratic Marc Friedenberg42,19531.92%-2.04%
Total votes'132,195''100.0%'N/A
Republican hold


Pennsylvania's 12th congressional district, 2020 [14]
Republican Fred Keller (incumbent) 241,035 70.8
Democratic Lee Griffin99,19929.2
Total votes340,234 100.0
Republican hold


Pennsylvania's 12th congressional district, 2022 [15]
Democratic Summer Lee 184,674 56.2
Republican Mike Doyle143,94643.8
Total votes328,620 100.0
Democratic hold

See also

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  1. "The 2022 Cook Partisan Voting Index". The Cook Political Report. Retrieved January 3, 2023.
  2. Cohn, Nate; Bloch, Matthew; Quealy, Kevin (February 19, 2018). "The New Pennsylvania House Districts Are In. We Review the Mapmakers' Choices". The Upshot. The New York Times. Retrieved February 20, 2018.
  3. Becker, Bernie (March 8, 2010). "Dems Choose Nominee for Murtha Seat". The New York Times . Retrieved March 9, 2010.
  4. Faher, Mike (March 12, 2010). "GOP chooses Burns for special election in 12th". The Tribune-Democratic . Retrieved March 12, 2010.
  5. "2012 General Election: Representative in Congress, District 12". Pennsylvania Department of State. Archived from the original on November 16, 2012. Retrieved November 15, 2012.
  6. Levy, Marc (March 2, 2019). "GOP state lawmaker becomes favorite in House race to succeed Marino". Center Daily Times. Associated Press. Archived from the original on March 7, 2019. Retrieved March 7, 2019.
  7. "Pennsylvania Democratic Party Announces Candidate For Special Election In The 12th Congressional District – Pennsylvania Democratic PartyPennsylvania Democratic Party". February 12, 2019. Retrieved March 7, 2019.
  8. "Ex-Congressman Marino Now Cites Health for Resigning". U.S. News & World Report. Associated Press. February 12, 2019. Retrieved February 14, 2019.
  9. "Statistics of Presidential and Congressional Election of November 6, 2012". Karen Haas, Clerk of the United States House of Representatives. February 28, 2013. Retrieved April 7, 2013.
  10. "Pennsylvania 2014 General Election – November 4, 2014 Official Results". Pennsylvania Secretary of State. November 4, 2014. Retrieved March 8, 2021.
  11. "Pennsylvania 2016 General Election – November 8, 2016 Official Results". Pennsylvania Secretary of State. November 8, 2016. Retrieved December 28, 2016.
  12. "2018 General Election: Representative in Congress". Pennsylvania Secretary of State. November 6, 2018. Retrieved November 12, 2018.
  13. "2019 Special Election 12th Congressional District". Pennsylvania Department of State. May 21, 2019. Retrieved May 29, 2019.
  14. "2020 Presidential Election – Representative in Congress". Pennsylvania Department of State. Retrieved November 25, 2020.
  15. "2022 General Election Official Returns - Representative in Congress". Pennsylvania Department of State.

Further reading

Coordinates: 40°25′42″N79°29′11″W / 40.42833°N 79.48639°W / 40.42833; -79.48639