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The Political RecordFederal electoral districtsNo. 24049Quebec

Mont-Saint-Bruno—L’Acadie

Mont-Saint-Bruno—L’Acadie is a federal riding in Quebec. Bienvenu-Olivier Ntumba (Liberal) has represented Mont-Saint-Bruno—L’Acadie since the 2025 election. Bienvenu-Olivier Ntumba (Liberal) took Mont-Saint-Bruno—L’Acadie from the Bloc Québécois in the 2025 election by 8,202 votes (12.0 points), with 47.1% of the vote. Noémie Rouillard (Bloc Québécois) was second with 35.1%, on a turnout of 77.8% of 88,845 electors. Member as of .

Beloeil—Chambly · Bloc QuébécoisBrossard—Saint-Lambert · LiberalLongueuil—Charles-LeMoyne—Greenfield Park · LiberalLongueuil—Saint-Hubert · LiberalPierre-Boucher—Les Patriotes—Verchères · Bloc QuébécoisSaint-Jean · Bloc QuébécoisMont-Saint-Bruno—L’Acadie
Fig. 1 — Mont-Saint-Bruno—L’Acadie on the board, 2023 boundaries; the ridings next door as the House holds them on . Open it on the board →

Who represents Mont-Saint-Bruno—L’Acadie

LBienvenu-Olivier Ntumba
Bienvenu-Olivier Ntumba's piece from the board. Illustration after the official portrait © House of Commons.

Bienvenu-Olivier Ntumba

Member of Parliament for Mont-Saint-Bruno—L’Acadie

Liberal

MP since · first term

  • Canadian Heritage committee
  • Industry and Technology committee

115 speeches in the 45th Parliament, most often on Safe Social Media Act.

Contact and office · House of Commons →

The 2025 result: Liberal gain from the Bloc Québécois

Share of the valid votes by candidate, Mont-Saint-Bruno—L’Acadie, April 28, 2025

Share of the valid votes by candidate, Mont-Saint-Bruno—L’Acadie, April 28, 2025Of the 68,251 valid votes, Bienvenu-Olivier Ntumba (Liberal) took 47.1%, Noémie Rouillard (Bloc Québécois) 35.1%, Nicolas Godin (Conservative) 13.7%, Mirabelle Leins (New Democratic) 2.3% and Maria Korpijaakko (Green) 1.2%; one other candidate took 0.6%.2025Turnout 77.8% of 88,845 electorsBienvenu-OlivierNtumbaLiberal47.1% · 32,1498,202 votes ahead · 12.0 ptsNoémie RouillardBloc Québécois35.1% · 23,947Nicolas GodinConservative13.7% · 9,335Mirabelle LeinsNew Democratic2.3% · 1,590Maria KorpijaakkoGreen1.2% · 833Other (1)0.6% · 397050%100%
Share of the valid votes by candidate, Mont-Saint-Bruno—L’Acadie, April 28, 2025Of the 68,251 valid votes, Bienvenu-Olivier Ntumba (Liberal) took 47.1%, Noémie Rouillard (Bloc Québécois) 35.1%, Nicolas Godin (Conservative) 13.7%, Mirabelle Leins (New Democratic) 2.3% and Maria Korpijaakko (Green) 1.2%; one other candidate took 0.6%.2025Turnout 77.8% of 88,845 electorsBienvenu-Olivier NtumbaLiberal47.1% · 32,1498,202 votes ahead · 12.0 ptsNoémie RouillardBloc Québécois35.1% · 23,947Nicolas GodinConservative13.7% · 9,335Mirabelle LeinsNew Democratic2.3% · 1,590Maria KorpijaakkoGreen1.2% · 833Other (1)0.6% · 397050%100%
Shares of the 68,251 valid votes; a candidate under 1% is counted with the others. Source: Elections Canada, official voting results, the 2025 general election.
The figures
CandidatePartyVotesShare
Bienvenu-Olivier NtumbaLiberal32,14947.1%
Noémie RouillardBloc Québécois23,94735.1%
Nicolas GodinConservative9,33513.7%
Mirabelle LeinsNew Democratic1,5902.3%
Maria KorpijaakkoGreen8331.2%
Other (1)3970.6%

Bienvenu-Olivier Ntumba (Liberal) won Mont-Saint-Bruno—L’Acadie on with 32,149 votes, 47.1% of the 68,251 valid votes. Noémie Rouillard (Bloc Québécois) was second with 23,947 (35.1%), 8,202 votes and 12.0 points behind.

Of the 68,251 valid votes, Bienvenu-Olivier Ntumba (Liberal) took 47.1%, Noémie Rouillard (Bloc Québécois) 35.1%, Nicolas Godin (Conservative) 13.7%, Mirabelle Leins (New Democratic) 2.3% and Maria Korpijaakko (Green) 1.2%; one other candidate took 0.6%. Turnout was 77.8% of 88,845 electors: 69,122 ballots cast, 68,251 of them valid, for 6 candidates.

Since 2021

Against the 2021 result on these boundaries, the Liberals are up 13.6 (33.5% to 47.1%), the Bloc Québécois down 9.6 (44.7% to 35.1%), the Conservatives up 4.2 (9.5% to 13.7%), the New Democrats down 5.9 (8.2% to 2.3%) and the Greens up 1.0 (0.2% to 1.2%), 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 Mont-Saint-Bruno—L’Acadie at each general election, 2004 to 2025, on today's boundaries

  1. 2004Bloc Québécois60.0%by 34.4 points over the Liberals
  2. 2006Bloc Québécois53.4%by 32.8 points over the Conservatives
  3. 2008Bloc Québécois47.9%by 28.7 points over the Liberals
  4. 2011changed handsNew Democratic43.8%by 13.4 points over the Bloc Québécois
  5. 2015changed handsLiberal32.2%by 3.9 points over the Bloc Québécois
  6. 2019changed handsBloc Québécois43.6%by 9.2 points over the Liberals
  7. 2021Bloc Québécois44.7%by 11.2 points over the Liberals
  8. 2025changed handsLiberal47.1%by 12.0 points over the Bloc Québécois
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
YearFirstShareSecondMargin (pts)Basis
2004Bloc Québécois60.0%Liberal34.4carried, our estimate
2006Bloc Québécois53.4%Conservative32.8carried, our estimate
2008Bloc Québécois47.9%Liberal28.7carried, our estimate
2011New Democratic43.8%Bloc Québécois13.4carried, our estimate
2015Liberal32.2%Bloc Québécois3.9carried, our estimate
2019Bloc Québécois43.6%Liberal9.2carried, our estimate
2021Bloc Québécois44.7%Liberal11.2transposed by Elections Canada
2025Liberal47.1%Bloc Québécois12.0official result

The Bloc Québécois were first at five of the eight general elections from 2004 to 2025, the Liberals at two and the NDP at one; it changed hands four times. In 2025 the Liberals took 47.1% of the vote here, 22.9 points above their average of 24.2% at the seven general elections from 2004 to 2021.

On today's boundaries the Bloc Québécois were first here in 2004 (60.0%), 2006 (53.4%), 2008 (47.9%), 2019 (43.6%) and 2021 (44.7%), the NDP in 2011 (43.8%) and the Liberals in 2015 (32.2%) and 2025 (47.1%), 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 Bloc Québécois · Stéphane Bergeron, by 6,037 votes (10.5 pts)
  • 2019 Bloc Québécois · Stéphane Bergeron, by 4,305 votes (7.2 pts)
  • 2015 Liberal · Michel Picard, by 2,388 votes (4.1 pts)

In Montarville on the 2013 boundaries, the riding most of the 2025 electors in today's Mont-Saint-Bruno—L’Acadie lived in; Elections Canada's official results.

What kind of place Mont-Saint-Bruno—L’Acadie is

Population
111,3202021 census
Area
215km²
Density
518people per km²
Electors
88,845on the 2025 lists
Distinctions · ranked against all 343 ridings
  • 7th-highest turnout in Canada: 77.8% of 88,845 electors voted · 7th of 3437th
    7th-highest turnout in Canada
    77.8% of 88,845 electors voted · 7th of 343
  • Changed hands in 2025: One of 58 of 343 ridings where the winning party changed from the transposed 2021 result (12 of 78 in Quebec)58
    Changed hands in 2025
    One of 58 of 343 ridings where the winning party changed from the transposed 2021 result (12 of 78 in Quebec)
  • 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
  • Median total household income is $106,000 — about 1.3 times the median riding's $84,000.
    highestlowest44th 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
  • Median age is 43.2 — a little higher than the median riding's 41.6.
    highestlowest118th highest of 343
  • Share who are immigrants is 11.1% — about 64 percent of the median riding's 17.3%.
    highestlowest126th 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 Mont-Saint-Bruno—L’Acadie lived in the old Montarville; by area, 27% of the riding came from other ridings.

Share of today's electorsFormer riding
90.2%Montarville 73.2% of the area · 99% of it kept
9.8%Beloeil—Chambly 26.7% of the area · 14% of it kept
0.0%Pierre-Boucher—Les Patriotes—Verchères 0.1% of the area · under 0.1% 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

CandidatePartyVotes%2021±
Bienvenu-Olivier NtumbaLiberal32,14947.1%33.5%+13.6
Noémie RouillardBloc Québécois23,94735.1%44.7%−9.6
Nicolas GodinConservative9,33513.7%9.5%+4.2
Mirabelle LeinsNew Democratic1,5902.3%8.2%−5.9
Maria KorpijaakkoGreen8331.2%0.2%+1.0
1 further candidate, under 1% of the vote
Patrick RochonPeople's3970.6%
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

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.
Fig. 2 — Each square is one election-day poll: ■ won by the Liberals (134) · ■ won by another party (72) · ▨ tied (1).
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.

On election day the Liberals took 44.0%, the Bloc Québécois 35.6%, the Conservatives 15.7%, the New Democrats 2.6% and the Greens 1.4%; in advance and special ballots, 51.4%, 34.3%, 10.9%, 1.9% and 0.9%, in that order.

Share of the valid votes by party, election-day polls against advance and special ballots, Mont-Saint-Bruno—L’Acadie, April 28, 2025

Share of the valid votes by party, election-day polls against advance and special ballots, Mont-Saint-Bruno—L’Acadie, April 28, 2025On election day the Liberals took 44.0%, the Bloc Québécois 35.6%, the Conservatives 15.7%, the New Democrats 2.6% and the Greens 1.4%; in advance and special ballots, 51.4%, 34.3%, 10.9%, 1.9% and 0.9%, in that order.Election dayAdvance and special± pts, the gapLiberal44.0%51.4%+7.4 ptsBloc Québécois35.6%34.3%−1.3 ptsConservative15.7%10.9%−4.8 ptsNew Democratic2.6%1.9%−0.7 ptsGreen1.4%0.9%−0.5 pts050%100%
Share of the valid votes by party, election-day polls against advance and special ballots, Mont-Saint-Bruno—L’Acadie, April 28, 2025On election day the Liberals took 44.0%, the Bloc Québécois 35.6%, the Conservatives 15.7%, the New Democrats 2.6% and the Greens 1.4%; in advance and special ballots, 51.4%, 34.3%, 10.9%, 1.9% and 0.9%, in that order.Election dayAdvance and special± pts, the gapLiberal44.0%51.4%+7.4 ptsBloc Québécois35.6%34.3%−1.3 ptsConservative15.7%10.9%−4.8 ptsNew Democratic2.6%1.9%−0.7 ptsGreen1.4%0.9%−0.5 pts050%100%
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
PartyElection dayAdvance and 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.

VWhere it is

loading basemap…
Fig. 3 — Mont-Saint-Bruno—L’Acadie and its 6 neighbouring ridings.

Sources and citation

"Mont-Saint-Bruno—L’Acadie — federal riding profile and 2025 results." The Political Record. https://politicalrecord.ca/riding/mont-saint-bruno-l-acadie/ 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.