The Political Record · Federal electoral districts
Mont-Saint-Bruno—L’Acadie
Federal riding · QC · No. 24049 · 2023 representation order
- Member
- Bienvenu-Olivier Ntumba Liberal
- 2025 result
- Liberal gain by 8,202 votes
- Turnout
- 77.8% of 88,845 electors
- Population
- 111,320 2021 census
- Area
- 215 km²
- Figures as of
- 2026-09-25
Distinctions · ranked against all 343 ridings
- Highest turnout in Canada77.8% of 88,845 electors voted · 7th of 343
- Changed hands in 2025One of 58 of 343 ridings where the winning party changed from the transposed 2021 result (12 of 78 in Quebec)
- Length of the ballot6 candidates stood · 61st of 343 in Canada
In brief
- Bienvenu-Olivier Ntumba took the seat for the Liberals by 8,202 votes (+12.0 points).
- 27% of today's riding was drawn from other ridings in 2023.
- Election-day and advance voters agreed on the winner; 58.5% of votes were cast on the day.
- Share of households that own their home is the 32nd highest of 343 ridings.
Illustration after: © House of Commons
Member of Parliament
Bienvenu-Olivier Ntumba
- Member: Canadian Heritage
- Member: Industry and Technology
IDid this riding change?
Yes. 27% of today's Mont-Saint-Bruno—L’Acadie came from ridings other than the old Montarville.
Share of today's areaFormer riding
73.2%Montarville 99% of it kept
26.7%Beloeil—Chambly 14% of it kept
0.1%Pierre-Boucher—Les Patriotes—Verchères 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
Liberal gain
Elected
Bienvenu-Olivier Ntumba
Liberal
32,149
47.1% of valid votes
Margin
8,202
votes · +12.0 pts
Runner-up
Noémie Rouillard
Bloc Québécois
23,947
35.1% of valid votes
Liberal 47.1% · Bloc Québécois 35.1% · Conservative 13.7% · New Democratic 2.3% · Green 1.2%
Turnout77.8% of 88,845 electors
| Candidate | Party | Votes | % | 2021 | ± |
|---|---|---|---|---|---|
| Bienvenu-Olivier Ntumba | Liberal | 32,149 | 47.1% | 33.5% | +13.6 |
| Noémie Rouillard | Bloc Québécois | 23,947 | 35.1% | 44.7% | −9.6 |
| Nicolas Godin | Conservative | 9,335 | 13.7% | 9.5% | +4.2 |
| Mirabelle Leins | New Democratic | 1,590 | 2.3% | 8.2% | −5.9 |
| Maria Korpijaakko | Green | 833 | 1.2% | 0.2% | +1.0 |
1 further candidate, under 1% of the vote
| Patrick Rochon | People's | 397 | 0.6% |
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
6.0 pts
Half the margin: the share that would have had to move from first to second.
Third place vs. the margin
9,335 votes
Conservative took more than the 8,202-vote margin. True in 100 of 343 ridings in 2025.
Election-day polls won by others
72 of 207
1 poll ended in an exact tie.
Flip the seatHypothetical
It would have taken 4,102 voters switching from Liberal to Bloc Québécois — 6.0% of the 68,251 valid votes, 6.0 points — to change the result. No ballot was cast this way; this only moves votes between the top two.
Liberal32,149
Bloc Québécois23,947
Still Liberal by 8,202 votes. Actual margin: 8,202.
IVElection day versus advance
Only 58.5% of this riding's votes were cast at election-day polls. The rest were advance or special ballots.
Election dayAdvance & specialGap
Liberal44.0%51.4%+7.4
Bloc Québécois35.6%34.3%−1.3
Conservative15.7%10.9%−4.8
New Democratic2.6%1.9%−0.7
Green1.4%0.9%−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.
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 39.0% — about 1.4 times the median riding's 28.2%.highestlowest104th highest of 343
- Share who are immigrants is 11.1% — about 64 percent of the median riding's 17.3%.highestlowest126th lowest of 343
- Share of households that own their home is 83.2% — about 1.2 times the median riding's 71.4%.highestlowest32nd highest of 343
- Share with French as a mother tongue is 83.6% — about 52.2 times the median riding's 1.6%.highestlowest43rd highest 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
loading basemap…
The card
No. 24049QC · 2025
Mont-Saint-Bruno—L’Acadie
Bienvenu-Olivier Ntumba
- Result
- Liberal gain by 8,202
- Turnout
- 77.8%
- Population
- 111,320
- Area
- 215 km²
Highest turnout in CanadaChanged hands in 2025Length of the ballot
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.
Open a neighbour to collect the next one.