Skip to the record

The Political RecordFederal electoral districtsNo. 24073Quebec

Terrebonne

Terrebonne is a federal riding in Quebec. Tatiana Auguste (Liberal, first elected to the House in 2025) has represented Terrebonne since the by-election of . Tatiana Auguste (Liberal) took Terrebonne from the Bloc Québécois in the 2025 election by 1 vote, with 38.7% of the vote. Nathalie Sinclair-Desgagné (Bloc Québécois) was second with 38.7%, on a turnout of 67.9% of 89,966 electors. The Supreme Court of Canada annulled that election on . Tatiana Auguste won it again at the by-election of by 668 votes (1.4 points) with 48.3% of the vote. Member as of .

Alfred-Pellan · LiberalHonoré-Mercier · LiberalLa Pointe-de-l'Île · Bloc QuébécoisMontcalm · Bloc QuébécoisRepentigny · Bloc QuébécoisRivière-du-Nord · Bloc QuébécoisThérèse-De Blainville · LiberalTerrebonne
Fig. 1 — Terrebonne on the board, 2023 boundaries; the ridings next door as the House holds them on . Open it on the board →

Who represents Terrebonne

LTatiana Auguste
Tatiana Auguste's piece from the board. Illustration after the official portrait © House of Commons.

Tatiana Auguste

Member of Parliament for Terrebonne

Liberal

First elected · 2 terms · elected again at the by-election of

  • Canadian Heritage committee
  • Veterans Affairs committee

86 speeches in the 45th Parliament, most often on National Strategy on Flood and Drought Forecasting Act.

Contact and office · House of Commons →

The 2025 result: Liberal gain from the Bloc Québécois

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

Share of the valid votes by candidate, Terrebonne, April 28, 2025Of the 60,278 valid votes, Tatiana Auguste (Liberal) took 38.7%, Nathalie Sinclair-Desgagné (Bloc Québécois) 38.7%, Adrienne Charles (Conservative) 18.2%, Maxime Beaudoin (New Democratic) 2.6% and Benjamin Rankin (Green) 1.0%; one other candidate took 0.7%.2025Turnout 67.9% of 89,966 electorsTatiana AugusteLiberal38.7% · 23,3521 vote ahead · under 0.1 ptsNathalie Sinclair-DesgagnéBloc Québécois38.7% · 23,351Adrienne CharlesConservative18.2% · 10,961Maxime BeaudoinNew Democratic2.6% · 1,556Benjamin RankinGreen1.0% · 630Other (1)0.7% · 428050%100%
Share of the valid votes by candidate, Terrebonne, April 28, 2025Of the 60,278 valid votes, Tatiana Auguste (Liberal) took 38.7%, Nathalie Sinclair-Desgagné (Bloc Québécois) 38.7%, Adrienne Charles (Conservative) 18.2%, Maxime Beaudoin (New Democratic) 2.6% and Benjamin Rankin (Green) 1.0%; one other candidate took 0.7%.2025Turnout 67.9% of 89,966 electorsTatiana AugusteLiberal38.7% · 23,3521 vote ahead · under 0.1 ptsNathalie Sinclair-DesgagnéBloc Québécois38.7% · 23,351Adrienne CharlesConservative18.2% · 10,961Maxime BeaudoinNew Democratic2.6% · 1,556Benjamin RankinGreen1.0% · 630Other (1)0.7% · 428050%100%
Shares of the 60,278 valid votes; a candidate under 1% is counted with the others. Source: Elections Canada, official voting results, the 2025 general election, as certified before the court annulled it.
The figures
CandidatePartyVotesShare
Tatiana AugusteLiberal23,35238.7%
Nathalie Sinclair-DesgagnéBloc Québécois23,35138.7%
Adrienne CharlesConservative10,96118.2%
Maxime BeaudoinNew Democratic1,5562.6%
Benjamin RankinGreen6301.0%
Other (1)4280.7%

Tatiana Auguste (Liberal) won Terrebonne on with 23,352 votes, 38.7% of the 60,278 valid votes. Nathalie Sinclair-Desgagné (Bloc Québécois) was second with 23,351 (38.7%), 1 vote and less than 0.1 points behind.

Of the 60,278 valid votes, Tatiana Auguste (Liberal) took 38.7%, Nathalie Sinclair-Desgagné (Bloc Québécois) 38.7%, Adrienne Charles (Conservative) 18.2%, Maxime Beaudoin (New Democratic) 2.6% and Benjamin Rankin (Green) 1.0%; one other candidate took 0.7%. Turnout was 67.9% of 89,966 electors: 61,118 ballots cast, 60,278 of them valid, for 6 candidates.

This election was annulled. The Supreme Court of Canada annulled the 2025 election here on (Sinclair-Desgagné v. Chief Electoral Officer of Canada et al., docket 42076). The figures are that election as Elections Canada certified it. Tatiana Auguste (Liberal) won the by-election of ; its result is in section II.

Since 2021

Against the 2021 result on these boundaries, the Liberals are up 10.0 (28.7% to 38.7%), the Bloc Québécois down 1.8 (40.5% to 38.7%), the Conservatives up 8.0 (10.2% to 18.2%), the New Democrats down 3.9 (6.5% to 2.6%) and the Greens down 0.4 (1.4% to 1.0%), 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 Terrebonne at each general election, 2004 to 2025, on today's boundaries

  1. 2004Bloc Québécois69.8%by 51.9 points over the Liberals
  2. 2006Bloc Québécois60.8%by 41.2 points over the Conservatives
  3. 2008Bloc Québécois54.2%by 39.0 points over the Liberals
  4. 2011changed handsNew Democratic51.3%by 20.8 points over the Bloc Québécois
  5. 2015changed handsBloc Québécois33.0%by 5.0 points over the Liberals
  6. 2019Bloc Québécois50.6%by 21.3 points over the Liberals
  7. 2021Bloc Québécois40.5%by 11.8 points over the Liberals
  8. 2025changed handsLiberal38.7%by less than 0.1 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 Québécois69.8%Liberal51.9carried, our estimate
2006Bloc Québécois60.8%Conservative41.2carried, our estimate
2008Bloc Québécois54.2%Liberal39.0carried, our estimate
2011New Democratic51.3%Bloc Québécois20.8carried, our estimate
2015Bloc Québécois33.0%Liberal5.0carried, our estimate
2019Bloc Québécois50.6%Liberal21.3carried, our estimate
2021Bloc Québécois40.5%Liberal11.8transposed by Elections Canada
2025Liberal38.7%Bloc Québécois0.0official result

The Bloc Québécois were first at six of the eight general elections from 2004 to 2025, the NDP at one and the Liberals at one; it changed hands three times. In 2025 the Liberals took 38.7% of the vote here, 19.5 points above their average of 19.2% at the seven general elections from 2004 to 2021.

On today's boundaries the Bloc Québécois were first here in 2004 (69.8%), 2006 (60.8%), 2008 (54.2%), 2015 (33.0%), 2019 (50.6%) and 2021 (40.5%), the NDP in 2011 (51.3%) and the Liberals in 2025 (38.7%), 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 · Nathalie Sinclair-Desgagné, by 6,795 votes (11.6 pts)
  • 2019 Bloc Québécois · Michel Boudrias, by 13,085 votes (21.3 pts)
  • 2015 Bloc Québécois · Michel Boudrias, by 2,922 votes (5.0 pts)

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

What kind of place Terrebonne is

Population
113,7952021 census
Area
160km²
Density
710people per km²
Electors
89,966on the 2025 lists
Distinctions · ranked against all 343 ridings
  • Closest race in Canada: Won by 1 vote (0.0 pts) · 1st of 3431st
    Closest race in Canada
    Won by 1 vote (0.0 pts) · 1st 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 with French as a mother tongue is 84.2% — about 52.6 times the median riding's 1.6%.
    highestlowest42nd highest of 343
  • Median total household income is $94,000 — a little higher than the median riding's $84,000.
    highestlowest93rd highest of 343
  • Share aged 25-64 with a bachelor's degree or higher is 20.8% — about 74 percent of the median riding's 28.2%.
    highestlowest106th lowest of 343
  • Share of households that own their home is 75.4% — a little higher than the median riding's 71.4%.
    highestlowest115th highest of 343
  • Share who are immigrants is 12.1% — about 70 percent of the median riding's 17.3%.
    highestlowest135th lowest of 343
  • Median age is 41.2 — about the same as the median riding's 41.6.
    highestlowest161st 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 — it shrank. All of today's Terrebonne, its electors as well as its ground, comes from the old Terrebonne, but it is only 98% of that riding by area. The rest went elsewhere.

Share of today's electorsFormer riding
100.0%Terrebonne 99.9% of the area · 98% 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

This election was annulled. The Supreme Court of Canada annulled the 2025 election here on 2026-02-13 (Sinclair-Desgagné v. Chief Electoral Officer of Canada et al., docket 42076). The figures on this page are that election as Elections Canada certified it. Tatiana Auguste (Liberal) won the by-election of 2026-04-13; its result is at the end of this section.
CandidatePartyVotes%2021±
Tatiana AugusteLiberal23,35238.7%28.7%+10.0
Nathalie Sinclair-DesgagnéBloc Québécois23,35138.7%40.5%−1.8
Adrienne CharlesConservative10,96118.2%10.2%+8.0
Maxime BeaudoinNew Democratic1,5562.6%6.5%−3.9
Benjamin RankinGreen6301.0%1.4%−0.4
1 further candidate, under 1% of the vote
Maria CantorePeople's4280.7%
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.

The by-election of 2026-04-13Liberal hold

Tatiana Auguste (Liberal) held Terrebonne for the Liberals at the by-election of 2026-04-13 by 668 votes (1.4 points) with 48.3% of the vote; Nathalie Sinclair-Desgagné (Bloc Québécois) was second with 46.9%.

Elected
Tatiana Auguste Liberal · 22,445 votes · 48.3%
Runner-up
Nathalie Sinclair-Desgagné Bloc Québécois · 21,777 votes · 46.9%
Margin
668 votes 1.4 pts · of 46,443 valid votes
Turnout
51.1% of 91,534 electors · 371 rejected ballots

The Liberal share here was 48.3% at the by-election of 2026-04-13 and 38.7% in the 2025 election, with 48 candidates on the ballot.

Source: Elections Canada, official voting results, read 2026-10-08. Every candidate and the full result →

IIIHow close was it, really

Third place vs. the margin
10,961 votes
Conservative took more than the 1-vote margin. True in 100 of 343 ridings in 2025.
Election-day polls won by others
92 of 178
1 poll ended in an exact tie.
Fig. 2 — Each square is one election-day poll: ■ won by the Liberals (85) · ■ won by another party (92) · ▨ tied (1).
Flip the seatHypothetical

It would have taken 1 voter switching from Liberal to Bloc Québécois — 0.00% of the 60,278 valid votes, under 0.1 points — to change the result. No ballot was cast this way; this only moves votes between the top two.

Liberal23,352
Bloc Québécois23,351
Still Liberal by 1 vote. Actual margin: 1.

IVElection day versus advance

Only 65.4% of this riding's votes were cast at election-day polls. The rest were advance or special ballots.

On election day the Bloc Québécois took 37.1%, the Liberals 37.5%, the Conservatives 20.5%, the New Democrats 2.9% and the Greens 1.2%; in advance and special ballots, 41.8%, 41.0%, 13.8%, 2.0% and 0.8%, in that order.

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

Share of the valid votes by party, election-day polls against advance and special ballots, Terrebonne, April 28, 2025On election day the Bloc Québécois took 37.1%, the Liberals 37.5%, the Conservatives 20.5%, the New Democrats 2.9% and the Greens 1.2%; in advance and special ballots, 41.8%, 41.0%, 13.8%, 2.0% and 0.8%, in that order.Election dayAdvance and special± pts, the gapBloc Québécois37.1%41.8%+4.7 ptsLiberal37.5%41.0%+3.5 ptsConservative20.5%13.8%−6.7 ptsNew Democratic2.9%2.0%−0.9 ptsGreen1.2%0.8%−0.4 pts050%100%
Share of the valid votes by party, election-day polls against advance and special ballots, Terrebonne, April 28, 2025On election day the Bloc Québécois took 37.1%, the Liberals 37.5%, the Conservatives 20.5%, the New Democrats 2.9% and the Greens 1.2%; in advance and special ballots, 41.8%, 41.0%, 13.8%, 2.0% and 0.8%, in that order.Election dayAdvance and special± pts, the gapBloc Québécois37.1%41.8%+4.7 ptsLiberal37.5%41.0%+3.5 ptsConservative20.5%13.8%−6.7 ptsNew Democratic2.9%2.0%−0.9 ptsGreen1.2%0.8%−0.4 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
Bloc Québécois37.1%41.8%+4.7
Liberal37.5%41.0%+3.5
Conservative20.5%13.8%−6.7
New Democratic2.9%2.0%−0.9
Green1.2%0.8%−0.4
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 — Terrebonne and its 7 neighbouring ridings.

Sources and citation

"Terrebonne — federal riding profile and 2025 results." The Political Record. https://politicalrecord.ca/riding/terrebonne/ 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.