Northumberland—Peterborough South (provincial electoral district)

For the federal district, see Northumberland—Peterborough South (federal electoral district).

Northumberland—Peterborough South is a provincial electoral district in Ontario, Canada. It elects one member to the Legislative Assembly of Ontario. The riding was created in 2015.^[1]

Northumberland—Peterborough South

Ontario electoral district
Northumberland-Peterborough South in relation to other electoral districts in Southern Ontario
Provincial electoral district
Legislature	Legislative Assembly of Ontario
MPP	David Piccini Progressive Conservative
District created	2015
First contested	2018
Last contested	2025
Demographics
Population (2016)	112,415
Electors (2018)	94,504
Area (km²)	2,903
Pop. density (per km²)	38.7
Census division(s)	Durham, Northumberland, Peterborough County
Census subdivision(s)	Alnwick/Haldimand, Brighton, Clarington, Cobourg, Cramahe, Hamilton Township, Otonabee–South Monaghan, Peterborough, Port Hope, Trent Hills

Members of Provincial Parliament

Northumberland—Peterborough South
Assembly	Years	Member		Party
Riding created from Northumberland—Quinte West, Durham, and Prince Edward—Hastings
42nd	2018–2022		David Piccini	Progressive Conservative
43rd	2022–2025
44th	2025–present

Election results

Winning party in each polling division of Northumberland—Peterborough South at the 2025 Ontario general election

2025 Ontario general election
Party	Candidate	Votes	%	±%
	Progressive Conservative	David Piccini	28,502	52.11	+1.18
	Liberal	Dorothy Noronha	17,705	32.37	+7.43
	New Democratic	Bruce Lepage	5,097	9.32	–3.80
	Green	Maxwell Groves	1,998	3.65	–2.02
	New Blue	Joshua Chalhoub	717	1.31	–0.95
	Ontario Party	Florian Bors	673	1.23	–1.85
Total valid votes/expense limit			54,692	99.23	–0.28
Total rejected, unmarked, and declined ballots			427	0.77	+0.28
Turnout			55,119	53.28	+1.56
Eligible voters			103,449
	Progressive Conservative hold		Swing		–3.13
Source: Elections Ontario[2]

Winning party in each polling division of Northumberland—Peterborough South at the 2022 Ontario general election

v t e 2022 Ontario general election
Party	Candidate	Votes	%	±%
	Progressive Conservative	David Piccini	26,419	50.93	+5.61
	Liberal	Jeff Kawzenuk	12,936	24.94	+0.77
	New Democratic	Kim McArthur-Jackson	6,806	13.12	−11.38
	Green	Lisa Francis	2,942	5.67	+1.14
	Ontario Party	Vanessa Head	1,598	3.08
	New Blue	Joshua Chalhoub	1,170	2.26
Total valid votes			51,871	100.0
Total rejected, unmarked, and declined ballots			258
Turnout			52,129	51.72
Eligible voters			99,034
	Progressive Conservative hold		Swing		+2.42
Source(s) "Summary of Valid Votes Cast for Each Candidate" (PDF). Elections Ontario. 2022. Archived from the original on 2023-05-18. "Statistical Summary by Electoral District" (PDF). Elections Ontario. 2022. Archived from the original on 2023-05-21.

v t e 2018 Ontario general election
Party	Candidate	Votes	%	±%
	Progressive Conservative	David Piccini	27,386	45.32	+9.78
	New Democratic	Jana Papuckoski	14,804	24.50	+6.03
	Liberal	Lou Rinaldi	14,603	24.17	-17.35
	Green	Jeff Wheeldon	2,740	4.53	+0.27
	Libertarian	John O'Keefe	425	0.70
	Trillium	Derek Sharp	278	0.46
	Stop Climate Change	Paul Cragg	187	0.31
Total valid votes			60,423	100.0
	Progressive Conservative notional gain from Liberal		Swing		+1.88
Source: Elections Ontario[3]

2014 general election redistributed results[4]
Party		Vote	%
	Liberal	20,584	41.52
	Progressive Conservative	17,616	35.54
	New Democratic	9,156	18.47
	Green	2,112	4.26
	Others	103	0.21