1818 United States House of Representatives elections in Pennsylvania

Pennsylvania elected its members October 13, 1818.

class=wikitable
rowspan=2 \| District ! colspan=3 \| Incumbent ! colspan=2 \| This race
Member ! Party ! First elected ! Results ! Candidates{{cite web \| last = Cox \| first = Harold \| title = U. S. Congressional Election 13 October 1818 \| work = The Wilkes University Election Statistics Project \| publisher = Wilkes University \| date = January 31, 2007 \| url = http://staffweb.wilkes.edu/harold.cox/rep/Congress%201818.pdf}}
rowspan=4 \| {{ushr\|Pennsylvania\|1\|X}} {{Small\|Plural district with 4 seats}} \| John Sergeant \| {{Party shading/Federalist}} \| Federalist \| 1815 (Special) \| Incumbent re-elected. \| rowspan=4 nowrap \| √ John Sergeant (Federalist) 14.2% √ Joseph Hemphill (Federalist) 14.2% √ Samuel Edwards (Federalist) 13.8% √ Thomas Forrest (Federalist) 13.2% Nicholas Biddle (Democratic-Republican) 11.7% John Connelly (Democratic-Republican) 10.9% George G. Leiper (Democratic-Republican) 10.7% Jacob Somner (Democratic-Republican) 10.7% Charles Hare (Democratic-Republican) 0.5%
Adam Seybert \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1808 1814 (Lost) 1816 \| {{Party shading/Federalist}} \| Incumbent retired. New member elected. Federalist gain.
William Anderson \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1808 1814 (Lost) 1816 \| {{Party shading/Federalist}} \| Incumbent retired. New member elected. Federalist gain.
Joseph Hopkinson \| {{Party shading/Federalist}} \| Federalist \| 1814 \| {{Party shading/Hold}} \| Incumbent retired. New member elected. Federalist hold.
rowspan=2 \| {{ushr\|Pennsylvania\|2\|X}} {{Small\|Plural district with 2 seats}} \| Levi Pawling \| {{Party shading/Federalist}} \| Federalist \| 1816 \| {{Party shading/Democratic-Republican}} \| Incumbent lost re-election. New member elected. Democratic-Republican gain. \| rowspan=2 nowrap \| √ William Darlington (Democratic-Republican) 27.0% √ Samuel Gross (Democratic-Republican) 26.5% Levi Pawling (Federalist) 23.4% James Kelton (Federalist) 23.1%
Isaac Darlington \| {{Party shading/Federalist}} \| Federalist \| 1816 \| {{Party shading/Democratic-Republican}} \| Incumbent retired. New member elected. Democratic-Republican gain.
rowspan=2 \| {{ushr\|Pennsylvania\|3\|X}} {{Small\|Plural district with 2 seats}} \| James M. Wallace \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1815 (Special) \| Incumbent re-elected. \| rowspan=2 nowrap \| √ Jacob Hibshman (Democratic-Republican) 26.6% √ James M. Wallace (Democratic-Republican) 26.3% James Montgomery (Federalist) 23.6% John Whiteside (F{{efn \| name="pc" \| Changed parties}}) 23.4%
John Whiteside \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1814 \| {{Party shading/Hold}} \| Incumbent lost re-election. New member elected. Democratic-Republican hold.
{{ushr\|Pennsylvania\|4\|X}} \| Jacob Spangler \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| {{Party shading/Hold}} \| Incumbent resigned April 20, 1818. New member elected. Democratic-Republican hold. Successor also elected to finish the current term. \| nowrap \| √ Jacob Hostetter (Democratic-Republican) 100%
rowspan=2 \| {{ushr\|Pennsylvania\|5\|X}} {{Small\|Plural district with 2 seats}} \| Andrew Boden \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| rowspan=2 nowrap \| √ David Fullerton (Democratic-Republican) 30.3% √ Andrew Boden (Democratic-Republican) 29.4% Alexander Cobean (Federalist) 20.6% John P. Helfenstein (Federalist) 19.8%
William Maclay \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1814 \| {{Party shading/Hold}} \| Incumbent retired. New member elected. Democratic-Republican hold.
rowspan=2 \| {{ushr\|Pennsylvania\|6\|X}} {{Small\|Plural district with 2 seats}} \| Samuel D. Ingham \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1818 (Special) \| {{Party shading/Hold}} \| Incumbent resigned July 6, 1818. New member elected. Democratic-Republican hold. Successor also elected the same day to finish the current term. \| rowspan=2 nowrap \| √ Samuel Moore (Democratic-Republican) 50.6% √ Thomas J. Rogers (Democratic-Republican) 49.4%
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 \| Incumbent re-elected. \| nowrap \| √ Joseph Hiester (Democratic-Republican) 65.7% Jonathan Hudson (Democratic-Republican) 34.3%
{{ushr\|Pennsylvania\|8\|X}} \| Alexander Ogle \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| {{Party shading/Hold}} \| Incumbent retired. New member elected. Democratic-Republican hold. \| nowrap \| √ Robert Philson (Democratic-Republican) 59.6% John A. Bard (Federalist) 40.4%
{{ushr\|Pennsylvania\|9\|X}} \| William P. Maclay \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| nowrap \| √ William P. Maclay (Democratic-Republican) 77.6% John Brown (Democratic-Republican) 22.4%
rowspan=2 \| {{ushr\|Pennsylvania\|10\|X}} {{Small\|Plural district with 2 seats}} \| William Wilson \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1814 \| {{Party shading/Hold}} \| Incumbent retired. New member elected. Democratic-Republican hold. \| rowspan=2 nowrap \| √ John Murray (Democratic-Republican) 50.4% √ George Denison (Democratic-Republican) 49.6%
John Murray \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1817 (Special) \| Incumbent re-elected.
{{ushr\|Pennsylvania\|11\|X}} \| David Marchand \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| nowrap \| √ David Marchand (Democratic-Republican) 52.6% James Kelly (Federalist) 47.4%
{{ushr\|Pennsylvania\|12\|X}} \| Thomas Patterson \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| nowrap \| √ Thomas Patterson (Democratic-Republican) 64.2% Joseph Pentecost (Federalist) 35.8%
{{ushr\|Pennsylvania\|13\|X}} \| Christian Tarr \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| nowrap \| √ Christian Tarr (Democratic-Republican) 78.7%{{efn \| name="inc" \| Based on incomplete data.}} Henry Heaton (Democratic-Republican) 21.3%
{{ushr\|Pennsylvania\|14\|X}} \| Henry Baldwin \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| nowrap \| √ Henry Baldwin (Democratic-Republican) 55.1% Samuel Douglas (Democratic-Republican) 44.9%
{{ushr\|Pennsylvania\|15\|X}} \| Robert Moore \| {{Party shading/Democratic-Republican}} \| Democratic-Republican \| 1816 \| Incumbent re-elected. \| nowrap \| √ Robert Moore (Democratic-Republican) 53.3% Thomas Wilson (Democratic-Republican) 46.7%

class=wikitable

rowspan=2 | District

! colspan=3 | Incumbent

! colspan=2 | This race

Member

! Party

! First elected

! Results

! Candidates{{cite web | last = Cox | first = Harold | title = U. S. Congressional Election 13 October 1818 | work = The Wilkes University Election Statistics Project | publisher = Wilkes University | date = January 31, 2007 | url = http://staffweb.wilkes.edu/harold.cox/rep/Congress%201818.pdf}}

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

| John Sergeant

| {{Party shading/Federalist}} | Federalist

| 1815 (Special)

| Incumbent re-elected.

| rowspan=4 nowrap | √ John Sergeant (Federalist) 14.2%
√ Joseph Hemphill (Federalist) 14.2%
√ Samuel Edwards (Federalist) 13.8%
√ Thomas Forrest (Federalist) 13.2%
Nicholas Biddle (Democratic-Republican) 11.7%
John Connelly (Democratic-Republican) 10.9%
George G. Leiper (Democratic-Republican) 10.7%
Jacob Somner (Democratic-Republican) 10.7%
Charles Hare (Democratic-Republican) 0.5%

Adam Seybert

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

| 1808
1814 (Lost)
1816

| {{Party shading/Federalist}} | Incumbent retired.
New member elected.
Federalist gain.

William Anderson

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

| 1808
1814 (Lost)
1816

| {{Party shading/Federalist}} | Incumbent retired.
New member elected.
Federalist gain.

Joseph Hopkinson

| {{Party shading/Federalist}} | Federalist

| 1814

| {{Party shading/Hold}} | Incumbent retired.
New member elected.
Federalist hold.

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

| Levi Pawling

| {{Party shading/Federalist}} | Federalist

| 1816

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

| rowspan=2 nowrap | √ William Darlington (Democratic-Republican) 27.0%
√ Samuel Gross (Democratic-Republican) 26.5%
Levi Pawling (Federalist) 23.4%
James Kelton (Federalist) 23.1%

Isaac Darlington

| {{Party shading/Federalist}} | Federalist

| 1816

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

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

| James M. Wallace

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

| 1815 (Special)

| Incumbent re-elected.

| rowspan=2 nowrap | √ Jacob Hibshman (Democratic-Republican) 26.6%
√ James M. Wallace (Democratic-Republican) 26.3%
James Montgomery (Federalist) 23.6%
John Whiteside (F{{efn | name="pc" | Changed parties}}) 23.4%

John Whiteside

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

| 1814

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

| Jacob Spangler

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

| 1816

| {{Party shading/Hold}} | Incumbent resigned April 20, 1818.
New member elected.
Democratic-Republican hold.
Successor also elected to finish the current term.

| nowrap | √ Jacob Hostetter (Democratic-Republican) 100%

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

| Andrew Boden

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

| 1816

| Incumbent re-elected.

| rowspan=2 nowrap | √ David Fullerton (Democratic-Republican) 30.3%
√ Andrew Boden (Democratic-Republican) 29.4%
Alexander Cobean (Federalist) 20.6%
John P. Helfenstein (Federalist) 19.8%

William Maclay

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

| 1814

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

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

| Samuel D. Ingham

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

| 1818 (Special)

| {{Party shading/Hold}} | Incumbent resigned July 6, 1818.
New member elected.
Democratic-Republican hold.
Successor also elected the same day to finish the current term.

| rowspan=2 nowrap | √ Samuel Moore (Democratic-Republican) 50.6%
√ Thomas J. Rogers (Democratic-Republican) 49.4%

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

| Incumbent re-elected.

| nowrap | √ Joseph Hiester (Democratic-Republican) 65.7%
Jonathan Hudson (Democratic-Republican) 34.3%

| Alexander Ogle

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

| 1816

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

| nowrap | √ Robert Philson (Democratic-Republican) 59.6%
John A. Bard (Federalist) 40.4%

| William P. Maclay

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

| 1816

| Incumbent re-elected.

| nowrap | √ William P. Maclay (Democratic-Republican) 77.6%
John Brown (Democratic-Republican) 22.4%

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

| William Wilson

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

| 1814

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

| rowspan=2 nowrap | √ John Murray (Democratic-Republican) 50.4%
√ George Denison (Democratic-Republican) 49.6%

John Murray

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

| 1817 (Special)

| Incumbent re-elected.

| David Marchand

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

| 1816

| Incumbent re-elected.

| nowrap | √ David Marchand (Democratic-Republican) 52.6%
James Kelly (Federalist) 47.4%

| Thomas Patterson

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

| 1816

| Incumbent re-elected.

| nowrap | √ Thomas Patterson (Democratic-Republican) 64.2%
Joseph Pentecost (Federalist) 35.8%

| Christian Tarr

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

| 1816

| Incumbent re-elected.

| nowrap | √ Christian Tarr (Democratic-Republican) 78.7%{{efn | name="inc" | Based on incomplete data.}}
Henry Heaton (Democratic-Republican) 21.3%

| Henry Baldwin

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

| 1816

| Incumbent re-elected.

| nowrap | √ Henry Baldwin (Democratic-Republican) 55.1%
Samuel Douglas (Democratic-Republican) 44.9%

| Robert Moore

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

| 1816

| Incumbent re-elected.

| nowrap | √ Robert Moore (Democratic-Republican) 53.3%
Thomas Wilson (Democratic-Republican) 46.7%