1818 United States House of Representatives elections in Pennsylvania

Pennsylvania elected its members October 13, 1818.

District	Incumbent			This race
	Member	Party	First elected	Results	Candidates[1]
Pennsylvania 1 Plural district with 4 seats	John Sergeant	Federalist	1815 (Special)	Incumbent re-elected.	√ 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	Democratic-Republican	1808 1814 (Lost) 1816	Incumbent retired. New member elected. Federalist gain.
	William Anderson	Democratic-Republican	1808 1814 (Lost) 1816	Incumbent retired. New member elected. Federalist gain.
	Joseph Hopkinson	Federalist	1814	Incumbent retired. New member elected. Federalist hold.
Pennsylvania 2 Plural district with 2 seats	Levi Pawling	Federalist	1816	Incumbent lost re-election. New member elected. Democratic-Republican gain.	√ William Darlington (Democratic-Republican) 27.0% √ Samuel Gross (Democratic-Republican) 26.5% Levi Pawling (Federalist) 23.4% James Kelton (Federalist) 23.1%
	Isaac Darlington	Federalist	1816	Incumbent retired. New member elected. Democratic-Republican gain.
Pennsylvania 3 Plural district with 2 seats	James M. Wallace	Democratic-Republican	1815 (Special)	Incumbent re-elected.	√ Jacob Hibshman (Democratic-Republican) 26.6% √ James M. Wallace (Democratic-Republican) 26.3% James Montgomery (Federalist) 23.6% John Whiteside (F[a]) 23.4%
	John Whiteside	Democratic-Republican	1814	Incumbent lost re-election. New member elected. Democratic-Republican hold.
Pennsylvania 4	Jacob Spangler	Democratic-Republican	1816	Incumbent resigned April 20, 1818. New member elected. Democratic-Republican hold. Successor also elected to finish the current term.	√ Jacob Hostetter (Democratic-Republican) 100%
Pennsylvania 5 Plural district with 2 seats	Andrew Boden	Democratic-Republican	1816	Incumbent re-elected.	√ 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	Democratic-Republican	1814	Incumbent retired. New member elected. Democratic-Republican hold.
Pennsylvania 6 Plural district with 2 seats	Samuel D. Ingham	Democratic-Republican	1818 (Special)	Incumbent resigned July 6, 1818. New member elected. Democratic-Republican hold. Successor also elected the same day to finish the current term.	√ Samuel Moore (Democratic-Republican) 50.6% √ Thomas J. Rogers (Democratic-Republican) 49.4%
	Thomas J. Rogers	Democratic-Republican	1818 (Special)	Incumbent re-elected.
Pennsylvania 7	Joseph Hiester	Democratic-Republican	1798 1804 (Retired) 1814	Incumbent re-elected.	√ Joseph Hiester (Democratic-Republican) 65.7% Jonathan Hudson (Democratic-Republican) 34.3%
Pennsylvania 8	Alexander Ogle	Democratic-Republican	1816	Incumbent retired. New member elected. Democratic-Republican hold.	√ Robert Philson (Democratic-Republican) 59.6% John A. Bard (Federalist) 40.4%
Pennsylvania 9	William P. Maclay	Democratic-Republican	1816	Incumbent re-elected.	√ William P. Maclay (Democratic-Republican) 77.6% John Brown (Democratic-Republican) 22.4%
Pennsylvania 10 Plural district with 2 seats	William Wilson	Democratic-Republican	1814	Incumbent retired. New member elected. Democratic-Republican hold.	√ John Murray (Democratic-Republican) 50.4% √ George Denison (Democratic-Republican) 49.6%
	John Murray	Democratic-Republican	1817 (Special)	Incumbent re-elected.
Pennsylvania 11	David Marchand	Democratic-Republican	1816	Incumbent re-elected.	√ David Marchand (Democratic-Republican) 52.6% James Kelly (Federalist) 47.4%
Pennsylvania 12	Thomas Patterson	Democratic-Republican	1816	Incumbent re-elected.	√ Thomas Patterson (Democratic-Republican) 64.2% Joseph Pentecost (Federalist) 35.8%
Pennsylvania 13	Christian Tarr	Democratic-Republican	1816	Incumbent re-elected.	√ Christian Tarr (Democratic-Republican) 78.7%[b] Henry Heaton (Democratic-Republican) 21.3%
Pennsylvania 14	Henry Baldwin	Democratic-Republican	1816	Incumbent re-elected.	√ Henry Baldwin (Democratic-Republican) 55.1% Samuel Douglas (Democratic-Republican) 44.9%
Pennsylvania 15	Robert Moore	Democratic-Republican	1816	Incumbent re-elected.	√ Robert Moore (Democratic-Republican) 53.3% Thomas Wilson (Democratic-Republican) 46.7%

See also

• 1818 Pennsylvania's 4th congressional district special election
• 1818 Pennsylvania's 6th congressional district special elections
• 1818 and 1819 United States House of Representatives elections
• List of United States representatives from Pennsylvania

Notes

1. Changed parties
2. Based on incomplete data.