The Political RecordFederal electoral districtsNo. 35086Ontario

Peterborough

Name: 2025 Canadian federal election in Peterborough
Start: 2025-04-28
End: 2025-04-28

Peterborough is a federal riding in Ontario. Emma Harrison (Liberal) has represented Peterborough since the 2025 election. Emma Harrison (Liberal) took Peterborough from the Conservatives in the 2025 election by 10,444 votes (13.3 points), with 54.3% of the vote. Michelle Ferreri (Conservative) was second with 41.0%, on a turnout of 74.1% of 107,119 electors. Member as of 2026-11-01.

Fig. 1 — Peterborough on the board, 2023 boundaries; the ridings next door as the House holds them on 2026-11-01. Open it on the board →

Who represents Peterborough

Emma Harrison's piece from the board. Illustration after the official portrait © House of Commons.

Emma Harrison

Member of Parliament for Peterborough

Liberal

MP since 2025-04-28 · first term

Agriculture and Agri-Food committee
Human Resources, Skills and Social Development and the Status of Persons with Disabilities committee

17 speeches in the 45th Parliament, most often on Protecting Victims Act.

Contact and office · House of Commons →

The 2025 result: Liberal gain from the Conservatives

Share of the valid votes by candidate, Peterborough, April 28, 2025

Shares of the 79,059 valid votes; a candidate under 1% is counted with the others. Source: Elections Canada, official voting results, the 2025 general election.

The figures

Candidate	Party	Votes	Share
Emma Harrison	Liberal	42,890	54.3%
Michelle Ferreri	Conservative	32,446	41.0%
Heather Ray	New Democratic	2,406	3.0%
Others (4)		1,317	1.7%

Emma Harrison (Liberal) won Peterborough on April 28, 2025 with 42,890 votes, 54.3% of the 79,059 valid votes. Michelle Ferreri (Conservative) was second with 32,446 (41.0%), 10,444 votes and 13.3 points behind.

Of the 79,059 valid votes, Emma Harrison (Liberal) took 54.3%, Michelle Ferreri (Conservative) 41.0% and Heather Ray (New Democratic) 3.0%; the 4 other candidates took 1.7% together. Turnout was 74.1% of 107,119 electors: 79,373 ballots cast, 79,059 of them valid, for 7 candidates.

Since 2021

Against the 2021 result on these boundaries, the Liberals are up 19.7 (34.6% to 54.3%), the Conservatives up 2.0 (39.0% to 41.0%) and the New Democrats down 16.1 (19.1% to 3.0%), in points of the valid votes.

2021 is Elections Canada's transposition of that election onto the 2023 boundaries, not an election held on these lines.

Since 2004: no party has held it

The party first in Peterborough at each general election, 2004 to 2025, on today's boundaries

2004Liberal43.5%by 11.6 points over the Conservatives
2006changed handsConservative35.9%by 3.6 points over the Liberals
2008Conservative47.4%by 15.9 points over the Liberals
2011Conservative49.7%by 24.8 points over the New Democrats
2015changed handsLiberal43.7%by 8.1 points over the Conservatives
2019Liberal39.0%by 3.6 points over the Conservatives
2021changed handsConservative39.0%by 4.3 points over the Liberals
2025changed handsLiberal54.3%by 13.3 points over the Conservatives

Each election carried onto today's boundaries by where the riding's 2025 electors lived: our estimate to 2019, Elections Canada's transposition for 2021, the official result for 2025. Parties are counted as they ran.

The figures

Year	First	Share	Second	Margin (pts)	Basis
2004	Liberal	43.5%	Conservative	11.6	carried, our estimate
2006	Conservative	35.9%	Liberal	3.6	carried, our estimate
2008	Conservative	47.4%	Liberal	15.9	carried, our estimate
2011	Conservative	49.7%	New Democratic	24.8	carried, our estimate
2015	Liberal	43.7%	Conservative	8.1	carried, our estimate
2019	Liberal	39.0%	Conservative	3.6	carried, our estimate
2021	Conservative	39.0%	Liberal	4.3	transposed by Elections Canada
2025	Liberal	54.3%	Conservative	13.3	official result

The Liberals were first at four of the eight general elections from 2004 to 2025, the Conservatives at four; it changed hands four times. In 2025 the Liberals took 54.3% of the vote here, 19.1 points above their average of 35.2% at the seven general elections from 2004 to 2021.

On today's boundaries the Liberals were first here in 2004 (43.5%), 2015 (43.7%), 2019 (39.0%) and 2025 (54.3%) and the Conservatives in 2006 (35.9%), 2008 (47.4%), 2011 (49.7%) and 2021 (39.0%), each with the share of the valid votes shown.

A stronghold is a party first at every general election since 2004, by an average of 20 points or more over the next party; held, first at every one; usually, first at all but one. By-elections are not counted. By this rule 160 of the 343 ridings have no degree. The results before 2021 are carried onto today's boundaries by where the riding's 2025 electors lived: our estimate, from the older boundaries of Taylor, Lucas, Kirby and Hewitt and the results in Sevi's "Who Runs?". 2021 is Elections Canada's transposition, and 2025 the official result.

Before 2025

2021 Conservative · Michelle Ferreri, by 2,738 votes (3.9 pts)
2019 Liberal · Maryam Monsef, by 3,043 votes (4.4 pts)
2015 Liberal · Maryam Monsef, by 5,824 votes (8.7 pts)

In Peterborough—Kawartha on the 2013 boundaries, the riding most of the 2025 electors in today's Peterborough lived in; Elections Canada's official results.

What kind of place Peterborough is

Population: 128,3452021 census
Area: 2,183km²
Density: 59people per km²
Electors: 107,119on the 2025 lists

Distinctions · ranked against all 343 ridings

10th-most populous in Canada
128,345 people, 2021 census · 10th of 343
Changed hands in 2025
One of 58 of 343 ridings where the winning party changed from the transposed 2021 result (21 of 122 in Ontario)

Median age is 46.0 — a little higher than the median riding's 41.6.
highestlowest65th highest of 343
Share with French as a mother tongue is 1.0% — about 63 percent of the median riding's 1.6%.
highestlowest101st lowest of 343
Share who are immigrants is 8.6% — about 50 percent of the median riding's 17.3%.
highestlowest102nd lowest of 343
Median total household income is $77,000 — a little lower than the median riding's $84,000.
highestlowest112th lowest of 343
Share of households that own their home is 69.5% — about the same as the median riding's 71.4%.
highestlowest151st lowest of 343
Share aged 25-64 with a bachelor's degree or higher is 25.9% — a little lower than the median riding's 28.2%.
highestlowest153rd lowest of 343

2021 Census on the 2023 boundaries; each rule places this riding among all 343. Density is the census population over the riding's area.

IDid this riding change?

Yes. 90% of the 2025 electors in today's Peterborough lived in the old Peterborough—Kawartha; by area, 27% of the riding came from other ridings.

Share of today's electorsFormer riding

90.1%Peterborough—Kawartha 73.2% of the area · 46% of it kept

9.9%Northumberland—Peterborough South 26.8% of the area · 18% of it kept

How this is measured. Electors: the share of the current riding's 2025 ordinary-list electors who lived in each former riding, each 2025 polling division placed in the 2013 riding a point inside it falls in. Area: the share of the current riding's area that came from each former riding, by intersecting the 2013 and 2023 boundary files, and how much of the former riding that part was. Area is land, not population. Elections Canada counts 48 of 343 ridings as entirely unchanged.

IIThe 2025 result

Candidate	Party	Votes	%	2021	±
Emma Harrison	Liberal	42,890	54.3%	34.6%	+19.7
Michelle Ferreri	Conservative	32,446	41.0%	39.0%	+2.0
Heather Ray	New Democratic	2,406	3.0%	19.1%	−16.1

4 further candidates, each under 1% of the vote

Jazmine Raine	Green	655	0.8%
Jami-Leigh McMaster	People's	272	0.3%
Chad Jewell	Independent	222	0.3%
Matthew Grove	Other	168	0.2%

The 2021 column is Elections Canada's official transposition of the 2021 result onto these 2023 boundaries. ± is the change in each party's share. It is not "swing": with four or more competitive parties there is no single pair to swing between.

IIIHow close was it, really

Third place vs. the margin

2,406 votes

New Democratic took fewer than the 10,444-vote margin.

Election-day polls won by others

113 of 257

3 polls ended in an exact tie.

Fig. 2 — Each square is one election-day poll: ■ won by the Liberals (141) · ■ won by another party (113) · ▨ tied (3).

Flip the seatHypothetical

It would have taken 5,223 voters switching from Liberal to Conservative — 6.6% of the 79,059 valid votes, 6.7 points — to change the result. No ballot was cast this way; this only moves votes between the top two.

Voters who switch: 0010,446

Liberal42,890

Conservative32,446

Still Liberal by 10,444 votes. Actual margin: 10,444.

IVElection day versus advance

Only 52.4% of this riding's votes were cast at election-day polls. The rest were advance or special ballots.

On election day the Liberals took 48.4%, the Conservatives 45.6%, the New Democrats 3.8% and the Greens 1.1%; in advance and special ballots, 60.7%, 36.0%, 2.2% and 0.6%, in that order.

Share of the valid votes by party, election-day polls against advance and special ballots, Peterborough, April 28, 2025

Shares of the valid votes cast at election-day polls, and of those cast at advance polls, at mobile polls and by special ballot; the gap is the second less the first, in points. Source: Elections Canada, poll-by-poll results, the 2025 general election.

The figures

Party	Election day	Advance and special	Gap
Liberal	48.4%	60.7%	+12.3
Conservative	45.6%	36.0%	−9.6
New Democratic	3.8%	2.2%	−1.6
Green	1.1%	0.6%	−0.5

An association, not a cause. Voters who cast ballots before election day differed from those who turned out on the day. It does not say why. There is no poll-level turnout figure on this page: the elector count on a polling division includes people who voted in advance and were counted elsewhere.

VWhere it is

loading basemap…

Fig. 3 — Peterborough and its 3 neighbouring ridings.

Sources and citation

"Peterborough — federal riding profile and 2025 results."
The Political Record. https://politicalrecord.ca/riding/peterborough/
Accessed 2026-11-10.

Results and transposition: Elections Canada. Boundaries: Elections Canada / Statistics Canada, Open Government Licence – Canada. Census: Statistics Canada 2021 Census. Member: House of Commons.

Figures reconcile to the certified national total of 19,641,663 votes. The member is as the House of Commons listed them on 2026-11-01. Page built 2026-11-10.