1820 United States House of Representatives elections in Pennsylvania

Pennsylvania elected its members October 10, 1820.

class=wikitable
rowspan=2 \| District ! colspan=3 \| Incumbent ! colspan=2 \| This race
Member ! Party ! First elected ! Results ! Candidates{{cite web \| last= Cox \| first= Harold \| work= Pennsylvania Election Statistics: 1682-2006 The Wilkes University Election Statistics Project \| publisher= Wilkes University \| title= 17th Congress 1821-1823 \| date= January 14, 2007 \| url= http://staffweb.wilkes.edu/harold.cox/rep/Congress%201820.pdf}}
rowspan=4 \| {{ushr\|Pennsylvania\|1\|X}} {{Small\|Plural district with 4 seats}} \| Joseph Hemphill \| {{Party shading/Federalist}} \| Federalist \| 1800 1802 (Lost) 1818 \| Incumbent re-elected. \| rowspan=4 nowrap \| {{Plainlist \| √ John Sergeant (Federalist) 24.8%{{efn \| John Sergeant was also supported by the Democratic-Republicans.}} √ Joseph Hemphill (Federalist) 15.1% √ William Milnor (Federalist) 14.8% √ Samuel Edwards (Federalist) 13.6% Thomas Forrest (Federalist) 10.5% Nicholas Biddle (Democratic-Republican) 10.5% Joseph Engle (Democratic-Republican) 9.9% Gideon Humphrey 0.8% }}
Samuel Edwards \| {{Party shading/Federalist}} \| Federalist \| 1818 \| Incumbent re-elected.
Thomas Forrest \| {{Party shading/Federalist}} \| Federalist \| 1818 \| {{Party shading/Hold}} \| Incumbent lost re-election. New member elected. Federalist hold.
John Sergeant \| {{Party shading/Federalist}} \| Federalist \| 1815 (Special) \| Incumbent re-elected.
rowspan=2 \| {{ushr\|Pennsylvania\|2\|X}} {{Small\|Plural district with 2 seats}} \| William Darlington \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1814 1816 (Lost) 1818 \| Incumbent re-elected. \| rowspan=2 nowrap \| {{Plainlist \| √ William Darlington (Democratic-Republican) 26.1% √ Samuel Gross (Democratic-Republican) 26.0% Charles Miner (Federalist) 24.1% John Henderson (Federalist) 23.8% }}
Samuel Gross \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 \| Incumbent re-elected.
rowspan=2 \| {{ushr\|Pennsylvania\|3\|X}} {{Small\|Plural district with 2 seats}} \| James M. Wallace \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1815 (Special) \| {{Party shading/Federalist}} \| Incumbent lost re-election. New member elected. Federalist gain. \| rowspan=2 nowrap \| {{Plainlist \| √ James Buchanan (Federalist) 27.9% √ John Phillips (Federalist) 27.5% Jacob Hibshman (Democratic-Republican) 22.8% James M. Wallace (Democratic-Republican) 21.8% }}
Jacob Hibshman \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 \| {{Party shading/Federalist}} \| Incumbent lost re-election. New member elected. Federalist gain.
{{ushr\|Pennsylvania\|4\|X}} \| Jacob Hostetter \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 \| {{Party shading/Hold}} \| Incumbent lost re-election. New member elected. Democratic-Republican hold. \| nowrap \| {{Plainlist \| √ James S. Mitchell (Democratic-Republican) 54.4% Jacob Hostetter (Federalist) 45.6%{{efn \| name="pc" \| Changed parties}} }}
rowspan=2 \| {{ushr\|Pennsylvania\|5\|X}} {{Small\|Plural district with 2 seats}} \| Andrew Boden \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| {{Party shading/Hold}} \| Incumbent retired. New member elected. Democratic-Republican hold. \| rowspan=2 nowrap \| {{Plainlist \| √ James McSherry (Democratic-Republican) 27.2% √ James Duncan (Democratic-Republican) 26.4% James Wilson (Federalist) 23.1% Isaiah Graham (Federalist) 22.8% Robert K. Lowry (I) 0.6% }}
David Fullerton \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 \| {{Party shading/Hold}} \| Incumbent resigned May 15, 1820. New member elected. Democratic-Republican hold. Successor was not a candidate in the same day's election to finish the term. Successor resigned in April 1821, leading to an October 9, 1821 special election.
rowspan=2 \| {{ushr\|Pennsylvania\|6\|X}} {{Small\|Plural district with 2 seats}} \| Samuel Moore \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 \| Incumbent re-elected. \| rowspan=2 nowrap \| {{Plainlist \| √ Samuel Moore (Democratic-Republican) 30.7% √ Thomas J. Rogers (Democratic-Republican) 28.6% Daniel W. Dingman (Federalist) 21.1% Matthais Morris (Federalist) 19.6% }}
Thomas J. Rogers \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 (Special) \| Incumbent re-elected.
{{ushr\|Pennsylvania\|7\|X}} \| Joseph Hiester \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1798 1804 (Retired) 1814 \| {{Party shading/Federalist}} \| Incumbent retired to run for Governor of Pennsylvania. New member elected. Federalist gain. Incumbent then resigned in December 1820 when elected Governor of Pennsylvania and successor lost the December 10, 1820 special election to finish the term. \| nowrap \| {{Plainlist \| √ Ludwig Worman (Federalist) 55.5% Gabriel Hiester (Democratic-Republican) 44.5% }}
{{ushr\|Pennsylvania\|8\|X}} \| Robert Philson \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 \| {{Party shading/Hold}} \| Incumbent lost re-election. New member elected. Democratic-Republican hold. \| nowrap \| {{Plainlist \| √ John Tod (Democratic-Republican) 75.7% Robert Philson (Federalist) 24.3%{{efn \| name="pc"}} }}
{{ushr\|Pennsylvania\|9\|X}} \| William P. Maclay \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| {{Party shading/Hold}} \| Incumbent lost re-election. New member elected. Democratic-Republican hold. \| nowrap \| {{Plainlist \| √ John Brown (Democratic-Republican) 54.6% William P. Maclay (Democratic-Republican) 45.4% }}
rowspan=2 \| {{ushr\|Pennsylvania\|10\|X}} {{Small\|Plural district with 2 seats}} \| George Denison \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 \| Incumbent re-elected. \| rowspan=2 nowrap \| {{Plainlist \| √ George Denison (Democratic-Republican) 34.0% √ William Cox Ellis (Federalist) 23.3% Abiel Fellows (Federalist) 16.1% Thomas Murray (Democratic-Republican) 15.7% Thomas Murray Jr. (Democratic-Republican) 11.0% }}
John Murray \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1817 (Special) \| {{Party shading/Federalist}} \| Incumbent retired. New member elected. Federalist gain. Incumbent resigned July 20, 1821, leading to an October 9, 1821 special election.
{{ushr\|Pennsylvania\|11\|X}} \| David Marchand \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| {{Party shading/Hold}} \| Incumbent retired. New member elected. Democratic-Republican hold. \| nowrap \| {{Plainlist \| √ George Plumer (Democratic-Republican) 54.7% Alexander W. Foster (Federalist) 45.3% }}
{{ushr\|Pennsylvania\|12\|X}} \| Thomas Patterson \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| nowrap \| {{Plainlist \| √ Thomas Patterson (Democratic-Republican) 67.3% Thomas McGiffen (Federalist) 32.7% }}
{{ushr\|Pennsylvania\|13\|X}} \| Christian Tarr \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| {{Party shading/Hold}} \| Incumbent lost re-election. New member elected. Democratic-Republican hold. \| nowrap \| {{Plainlist \| √ Andrew Stewart (Democratic-Republican) 48.3% Christian Tarr (Democratic-Republican) 40.1% Charles Porter (Federalist) 11.6% }}
{{ushr\|Pennsylvania\|14\|X}} \| Henry Baldwin \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| nowrap \| {{Plainlist \| √ Henry Baldwin (Democratic-Republican) 63.8% William Marks (Federalist) 36.2% }}
{{ushr\|Pennsylvania\|15\|X}} \| Robert Moore \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| {{Party shading/Hold}} \| Incumbent lost re-election. New member elected. Democratic-Republican hold. \| nowrap \| {{Plainlist \| √ Patrick Farrelly (Democratic-Republican) 53.7% Robert Moore (Federalist) 43.4%{{efn \| name="pc"}} Beven Pearson 2.9% }}

class=wikitable

rowspan=2 | District

! colspan=3 | Incumbent

! colspan=2 | This race

Member

! Party

! First elected

! Results

! Candidates{{cite web | last= Cox | first= Harold | work= Pennsylvania Election Statistics: 1682-2006 The Wilkes University Election Statistics Project | publisher= Wilkes University | title= 17th Congress 1821-1823 | date= January 14, 2007 | url= http://staffweb.wilkes.edu/harold.cox/rep/Congress%201820.pdf}}

rowspan=4 | {{ushr|Pennsylvania|1|X}}
{{Small|Plural district with 4 seats}}

| Joseph Hemphill

| {{Party shading/Federalist}} | Federalist

| 1800
1802 (Lost)
1818

| Incumbent re-elected.

| rowspan=4 nowrap | {{Plainlist |

√ John Sergeant (Federalist) 24.8%{{efn | John Sergeant was also supported by the Democratic-Republicans.}}
√ Joseph Hemphill (Federalist) 15.1%
√ William Milnor (Federalist) 14.8%
√ Samuel Edwards (Federalist) 13.6%
Thomas Forrest (Federalist) 10.5%
Nicholas Biddle (Democratic-Republican) 10.5%
Joseph Engle (Democratic-Republican) 9.9%
Gideon Humphrey 0.8%

}}

Samuel Edwards

| {{Party shading/Federalist}} | Federalist

| 1818

| Incumbent re-elected.

Thomas Forrest

| {{Party shading/Federalist}} | Federalist

| 1818

| {{Party shading/Hold}} | Incumbent lost re-election.
New member elected.
Federalist hold.

John Sergeant

| {{Party shading/Federalist}} | Federalist

| 1815 (Special)

| Incumbent re-elected.

rowspan=2 | {{ushr|Pennsylvania|2|X}}
{{Small|Plural district with 2 seats}}

| William Darlington

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1814
1816 (Lost)
1818

| Incumbent re-elected.

| rowspan=2 nowrap | {{Plainlist |

√ William Darlington (Democratic-Republican) 26.1%
√ Samuel Gross (Democratic-Republican) 26.0%
Charles Miner (Federalist) 24.1%
John Henderson (Federalist) 23.8%

}}

Samuel Gross

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1818

| Incumbent re-elected.

rowspan=2 | {{ushr|Pennsylvania|3|X}}
{{Small|Plural district with 2 seats}}

| James M. Wallace

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1815 (Special)

| {{Party shading/Federalist}} | Incumbent lost re-election.
New member elected.
Federalist gain.

| rowspan=2 nowrap | {{Plainlist |

√ James Buchanan (Federalist) 27.9%
√ John Phillips (Federalist) 27.5%
Jacob Hibshman (Democratic-Republican) 22.8%
James M. Wallace (Democratic-Republican) 21.8%

}}

Jacob Hibshman

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1818

| {{Party shading/Federalist}} | Incumbent lost re-election.
New member elected.
Federalist gain.

| Jacob Hostetter

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1818

| {{Party shading/Hold}} | Incumbent lost re-election.
New member elected.
Democratic-Republican hold.

| nowrap | {{Plainlist |

√ James S. Mitchell (Democratic-Republican) 54.4%
Jacob Hostetter (Federalist) 45.6%{{efn | name="pc" | Changed parties}}

}}

rowspan=2 | {{ushr|Pennsylvania|5|X}}
{{Small|Plural district with 2 seats}}

| Andrew Boden

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1816

| {{Party shading/Hold}} | Incumbent retired.
New member elected.
Democratic-Republican hold.

| rowspan=2 nowrap | {{Plainlist |

√ James McSherry (Democratic-Republican) 27.2%
√ James Duncan (Democratic-Republican) 26.4%
James Wilson (Federalist) 23.1%
Isaiah Graham (Federalist) 22.8%
Robert K. Lowry (I) 0.6%

}}

David Fullerton

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1818

| {{Party shading/Hold}} | Incumbent resigned May 15, 1820.
New member elected.
Democratic-Republican hold.
Successor was not a candidate in the same day's election to finish the term.
Successor resigned in April 1821, leading to an October 9, 1821 special election.

rowspan=2 | {{ushr|Pennsylvania|6|X}}
{{Small|Plural district with 2 seats}}

| Samuel Moore

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1818

| Incumbent re-elected.

| rowspan=2 nowrap | {{Plainlist |

√ Samuel Moore (Democratic-Republican) 30.7%
√ Thomas J. Rogers (Democratic-Republican) 28.6%
Daniel W. Dingman (Federalist) 21.1%
Matthais Morris (Federalist) 19.6%

}}

Thomas J. Rogers

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1818 (Special)

| Incumbent re-elected.

| Joseph Hiester

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1798
1804 (Retired)
1814

| {{Party shading/Federalist}} | Incumbent retired to run for Governor of Pennsylvania.
New member elected.
Federalist gain.
Incumbent then resigned in December 1820 when elected Governor of Pennsylvania and successor lost the December 10, 1820 special election to finish the term.

| nowrap | {{Plainlist |

√ Ludwig Worman (Federalist) 55.5%
Gabriel Hiester (Democratic-Republican) 44.5%

}}

| Robert Philson

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1818

| {{Party shading/Hold}} | Incumbent lost re-election.
New member elected.
Democratic-Republican hold.

| nowrap | {{Plainlist |

√ John Tod (Democratic-Republican) 75.7%
Robert Philson (Federalist) 24.3%{{efn | name="pc"}}

}}

| William P. Maclay

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1816

| {{Party shading/Hold}} | Incumbent lost re-election.
New member elected.
Democratic-Republican hold.

| nowrap | {{Plainlist |

√ John Brown (Democratic-Republican) 54.6%
William P. Maclay (Democratic-Republican) 45.4%

}}

rowspan=2 | {{ushr|Pennsylvania|10|X}}
{{Small|Plural district with 2 seats}}

| George Denison

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1818

| Incumbent re-elected.

| rowspan=2 nowrap | {{Plainlist |

√ George Denison (Democratic-Republican) 34.0%
√ William Cox Ellis (Federalist) 23.3%
Abiel Fellows (Federalist) 16.1%
Thomas Murray (Democratic-Republican) 15.7%
Thomas Murray Jr. (Democratic-Republican) 11.0%

}}

John Murray

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1817 (Special)

| {{Party shading/Federalist}} | Incumbent retired.
New member elected.
Federalist gain.
Incumbent resigned July 20, 1821, leading to an October 9, 1821 special election.

| David Marchand

| {{Party shading/Democratic-Republican}} | Democratic-Republican

| 1816

| {{Party shading/Hold}} | Incumbent retired.
New member elected.
Democratic-Republican hold.

| nowrap | {{Plainlist |