The Political Record · Federal electoral districts
Thornhill
Federal riding · ON · No. 35106 · 2023 representation order
- Member
- Melissa Lantsman Conservative
- 2025 result
- Conservative hold by 23,546 votes
- Turnout
- 68.9% of 98,136 electors
- Population
- 124,870 2021 census
- Area
- 70 km²
- Figures as of
- 2026-09-25
Distinctions · ranked against all 343 ridings
- Smallest Indigenous share0.2% report an Indigenous identity, 6th lowest of 343 (Share with an Indigenous identity, 2021 census)
- Population, largest first124,870 people, 2021 census · 28th of 343 in Canada
- Width of the marginWon by 35.2 points (23,546 votes) · 64th of 343 in Canada
In brief
- Melissa Lantsman held the seat for the Conservatives by 23,546 votes (+35.2 points).
- 6% of today's riding was drawn from other ridings in 2023.
- Election-day and advance voters agreed on the winner; 54.8% of votes were cast on the day.
- Share aged 25-64 with a bachelor's degree or higher is the 19th highest of 343 ridings.
Illustration after: © House of Commons
Member of Parliament
Melissa Lantsman
IDid this riding change?
Yes. 6% of today's Thornhill came from ridings other than the old Thornhill.
Share of today's areaFormer riding
93.6%Thornhill
6.3%King—Vaughan 1% of it kept
0.1%Richmond Hill 0% of it kept
How this is measured. Share of the current riding's area that came from each former riding, by intersecting the 2013 and 2023 boundary files. It is area, not population. Elections Canada counts 48 of 343 ridings as entirely unchanged.
IIThe 2025 result
Conservative hold
Elected
Melissa Lantsman
Conservative
44,419
66.4% of valid votes
Margin
23,546
votes · +35.2 pts
Runner-up
Liane Kotler
Liberal
20,873
31.2% of valid votes
Conservative 66.4% · Liberal 31.2% · New Democratic 1.2%
Turnout68.9% of 98,136 electors
| Candidate | Party | Votes | % | 2021 | ± |
|---|---|---|---|---|---|
| Melissa Lantsman | Conservative | 44,419 | 66.4% | 51.3% | +15.1 |
| Liane Kotler | Liberal | 20,873 | 31.2% | 35.8% | −4.6 |
| William McCarty | New Democratic | 833 | 1.2% | 5.9% | −4.7 |
2 further candidates, each under 1% of the vote
| Amir Hart | People's | 440 | 0.7% |
| Dominic Piotrowski | Green | 353 | 0.5% |
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
Swing needed to flip
17.6 pts
Half the margin: the share that would have had to move from first to second.
Third place vs. the margin
833 votes
New Democratic took fewer than the 23,546-vote margin.
Election-day polls won by others
21 of 240
No poll ended in a tie.
Flip the seatHypothetical
It would have taken 11,774 voters switching from Conservative to Liberal — 17.6% of the 66,918 valid votes, 17.6 points — to change the result. No ballot was cast this way; this only moves votes between the top two.
Conservative44,419
Liberal20,873
Still Conservative by 23,546 votes. Actual margin: 23,546.
IVElection day versus advance
Only 54.8% of this riding's votes were cast at election-day polls. The rest were advance or special ballots.
Election dayAdvance & specialGap
Conservative64.1%69.1%+5.0
Liberal32.8%29.2%−3.6
New Democratic1.6%0.8%−0.8
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.
VWhat kind of place this is
- Median total household income is $106,000 — about 1.3 times the median riding's $84,000.highestlowest44th highest of 343
- Median age is 43.2 — a little higher than the median riding's 41.6.highestlowest118th highest of 343
- Share aged 25-64 with a bachelor's degree or higher is 57.4% — about 2.0 times the median riding's 28.2%.highestlowest19th highest of 343
- Share who are immigrants is 52.1% — about 3.0 times the median riding's 17.3%.highestlowest25th highest of 343
- Share of households that own their home is 78.4% — a little higher than the median riding's 71.4%.highestlowest75th highest of 343
- Share with French as a mother tongue is 0.8% — about 50 percent of the median riding's 1.6%.highestlowest61st lowest of 343
2021 Census, keyed to the 2023 representation order. Comparisons are against the median riding, not Canada as a whole. Each rule places this riding among all 343.
VIWhere it is
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The card
No. 35106ON · 2025
Thornhill
Melissa Lantsman
- Result
- Conservative hold by 23,546
- Turnout
- 68.9%
- Population
- 124,870
- Area
- 70 km²
Smallest Indigenous sharePopulation, largest firstWidth of the margin
One of 343The Political Record
A card exists for every one of the 343 ridings.
Every figure on it is the figure on this page: the 2025 result and margin, turnout, the 2021 census population, the area, and the distinctions ranked against all 343 ridings. The portrait is an illustration after the official House of Commons photograph.
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