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Pennsylvania elected its members October 10, 1820.

District	Incumbent			This race
District	Member	Party	First elected	Results	Candidates^[1]
Pennsylvania 1 Plural district with 4 seats	Joseph Hemphill	Federalist	1800 1802 (Lost) 1818	Incumbent re-elected.	√ John Sergeant (Federalist) 24.8%^[a] √ 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	Federalist	1818	Incumbent re-elected.
	Thomas Forrest	Federalist	1818	Incumbent lost re-election. New member elected. Federalist hold.
	John Sergeant	Federalist	1815 (Special)	Incumbent re-elected.
Pennsylvania 2 Plural district with 2 seats	William Darlington	Democratic-Republican	1814 1816 (Lost) 1818	Incumbent re-elected.	√ William Darlington (Democratic-Republican) 26.1% √ Samuel Gross (Democratic-Republican) 26.0% Charles Miner (Federalist) 24.1% John Henderson (Federalist) 23.8%
Pennsylvania 2 Plural district with 2 seats	Samuel Gross	Democratic-Republican	1818	Incumbent re-elected.
Pennsylvania 3 Plural district with 2 seats	James M. Wallace	Democratic-Republican	1815 (Special)	Incumbent lost re-election. New member elected. Federalist gain.	√ James Buchanan (Federalist) 27.9% √ John Phillips (Federalist) 27.5% Jacob Hibshman (Democratic-Republican) 22.8% James M. Wallace (Democratic-Republican) 21.8%
Pennsylvania 3 Plural district with 2 seats	Jacob Hibshman	Democratic-Republican	1818	Incumbent lost re-election. New member elected. Federalist gain.
Pennsylvania 4	Jacob Hostetter	Democratic-Republican	1818	Incumbent lost re-election. New member elected. Democratic-Republican hold.	√ James S. Mitchell (Democratic-Republican) 54.4% Jacob Hostetter (Federalist) 45.6%^[b]
Pennsylvania 5 Plural district with 2 seats	Andrew Boden	Democratic-Republican	1816	Incumbent retired. New member elected. Democratic-Republican hold.	√ 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%
Pennsylvania 5 Plural district with 2 seats	David Fullerton	Democratic-Republican	1818	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.
Pennsylvania 6 Plural district with 2 seats	Samuel Moore	Democratic-Republican	1818	Incumbent re-elected.	√ Samuel Moore (Democratic-Republican) 30.7% √ Thomas J. Rogers (Democratic-Republican) 28.6% Daniel W. Dingman (Federalist) 21.1% Matthais Morris (Federalist) 19.6%
Pennsylvania 6 Plural district with 2 seats	Thomas J. Rogers	Democratic-Republican	1818 (Special)	Incumbent re-elected.
Pennsylvania 7	Joseph Hiester	Democratic-Republican	1798 1804 (Retired) 1814	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.	√ Ludwig Worman (Federalist) 55.5% Gabriel Hiester (Democratic-Republican) 44.5%
Pennsylvania 8	Robert Philson	Democratic-Republican	1818	Incumbent lost re-election. New member elected. Democratic-Republican hold.	√ John Tod (Democratic-Republican) 75.7% Robert Philson (Federalist) 24.3%^[b]
Pennsylvania 9	William P. Maclay	Democratic-Republican	1816	Incumbent lost re-election. New member elected. Democratic-Republican hold.	√ John Brown (Democratic-Republican) 54.6% William P. Maclay (Democratic-Republican) 45.4%
Pennsylvania 10 Plural district with 2 seats	George Denison	Democratic-Republican	1818	Incumbent re-elected.	√ 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%
Pennsylvania 10 Plural district with 2 seats	John Murray	Democratic-Republican	1817 (Special)	Incumbent retired. New member elected. Federalist gain. Incumbent resigned July 20, 1821, leading to an October 9, 1821 special election.
Pennsylvania 11	David Marchand	Democratic-Republican	1816	Incumbent retired. New member elected. Democratic-Republican hold.	√ George Plumer (Democratic-Republican) 54.7% Alexander W. Foster (Federalist) 45.3%
Pennsylvania 12	Thomas Patterson	Democratic-Republican	1816	Incumbent re-elected.	√ Thomas Patterson (Democratic-Republican) 67.3% Thomas McGiffen (Federalist) 32.7%
Pennsylvania 13	Christian Tarr	Democratic-Republican	1816	Incumbent lost re-election. New member elected. Democratic-Republican hold.	√ Andrew Stewart (Democratic-Republican) 48.3% Christian Tarr (Democratic-Republican) 40.1% Charles Porter (Federalist) 11.6%
Pennsylvania 14	Henry Baldwin	Democratic-Republican	1816	Incumbent re-elected.	√ Henry Baldwin (Democratic-Republican) 63.8% William Marks (Federalist) 36.2%
Pennsylvania 15	Robert Moore	Democratic-Republican	1816	Incumbent lost re-election. New member elected. Democratic-Republican hold.	√ Patrick Farrelly (Democratic-Republican) 53.7% Robert Moore (Federalist) 43.4%^[b] Beven Pearson 2.9%

Notes

^ John Sergeant was also supported by the Democratic-Republicans.
^ ^a ^b ^c Changed parties

References

^ Cox, Harold (January 14, 2007). "17th Congress 1821-1823" (PDF). Pennsylvania Election Statistics: 1682-2006 The Wilkes University Election Statistics Project. Wilkes University.