Yes — it shrank. All of today's Ville-Marie—Le Sud-Ouest—Île-des-Soeurs comes from the old Ville-Marie—Le Sud-Ouest—Île-des-Soeurs, but it is only 69% of that riding. The rest went elsewhere.
Share of today's areaFormer riding
99.9%Ville-Marie—Le Sud-Ouest—Île-des-Soeurs 69% 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 hold
Elected
Marc Miller
Liberal
30,905
63.7% of valid votes
Margin
21,792
votes · +44.9 pts
Runner-up
Steve Shanahan
Conservative
9,113
18.8% of valid votes
Liberal 63.7% · Conservative 18.8% · Bloc Québécois 9.0% · New Democratic 6.0% · Green 2.1%
Turnout59.8% of 82,037 electors
Candidate
Party
Votes
%
2021
±
Marc Miller
Liberal
30,905
63.7%
50.6%
+13.1
Steve Shanahan
Conservative
9,113
18.8%
12.6%
+6.2
Kevin Majaducon
Bloc Québécois
4,364
9.0%
11.8%
−2.8
Suzanne Dufresne
New Democratic
2,932
6.0%
17.8%
−11.8
Nathe Perrone
Green
996
2.1%
2.6%
−0.5
1 further candidate, under 1% of the vote
Giovanni Di Placido
Other
209
0.4%
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
22.4 pts
Half the margin: the share that would have had to move from first to second.
Third place vs. the margin
4,364 votes
Bloc Québécois took fewer than the 21,792-vote margin.
Election-day polls won by others
0 of 173
No poll ended in a tie.
Fig. 2 — Each square is one election-day poll: ■ won by the Liberals (173) · ■ won by another party (0).
Flip the seatHypothetical
It would have taken 10,897 voters switching from Liberal to Conservative — 22.5% of the 48,519 valid votes, 22.4 points — to change the result. No ballot was cast this way; this only moves votes between the top two.
Liberal30,905
Conservative9,113
Still Liberal by 21,792 votes. Actual margin: 21,792.
IVElection day versus advance
Only 55.8% of this riding's votes were cast at election-day polls. The rest were advance or special ballots.
Election dayAdvance & specialGap
Liberal59.2%69.3%+10.1
Conservative21.6%15.2%−6.4
Bloc Québécois9.6%8.2%−1.4
New Democratic6.5%5.4%−1.1
Green2.5%1.5%−1.0
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 $60,400 — about 72 percent of the median riding's $84,000.
highestlowest14th lowest of 343
Median age is 34.4 — about 83 percent of the median riding's 41.6.
highestlowest9th lowest of 343
Share aged 25-64 with a bachelor's degree or higher is 65.3% — about 2.3 times the median riding's 28.2%.
highestlowest7th highest of 343
Share who are immigrants is 32.6% — about 1.9 times the median riding's 17.3%.
highestlowest90th highest of 343
Share of households that own their home is 33.6% — about 47 percent of the median riding's 71.4%.
highestlowest11th lowest of 343
Share with French as a mother tongue is 36.1% — about 22.6 times the median riding's 1.6%.
highestlowest75th 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…
Fig. 3 — Ville-Marie—Le Sud-Ouest—Île-des-Soeurs and its 5 neighbouring ridings.
Most university degreesSmallest householdsYoungest median ageWon every election-day pollWidest margin in Quebec
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.