The Political Record · Federal electoral districts
Milton East—Halton Hills South
Milton-Est—Halton Hills-Sud
Federal riding · ON · No. 35060 · 2023 representation order
- Member
- Kristina Tesser Derksen Liberal
- 2025 result
- Liberal hold by 21 votes
- Turnout
- 73.6% of 90,990 electors
- Population
- 116,730 2021 census
- Area
- 257 km²
- Figures as of
- 2026-09-25
Distinctions · ranked against all 343 ridings
- Closest race in CanadaWon by 21 votes (0.1 pts) · 4th of 343
- Highest household incomeMedian household income $129,000, 6th highest of 343 (Median total household income, 2021 census)
- Most home owners85.9% of households own their home, 9th highest of 343 (Share of households that own their home, 2021 census)
- Decided before election dayOn election-day polls alone another party led; advance and special ballots decided it · one of 27 of 343
In brief
Illustration after: © House of Commons
Member of Parliament
Kristina Tesser Derksen
- Member: Medical Assistance in Dying
- Member: Public Accounts
- Member: Status of Women
IDid this riding change?
Yes. 40% of today's Milton East—Halton Hills South came from ridings other than the old Wellington—Halton Hills.
Share of today's areaFormer riding
60.1%Wellington—Halton Hills 10% of it kept
39.9%Milton 22% 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
Kristina Tesser Derksen
Liberal
32,178
48.3% of valid votes
Margin
21
votes · +0.1 pts
Runner-up
Parm Gill
Conservative
32,157
48.2% of valid votes
Liberal 48.3% · Conservative 48.2% · New Democratic 1.5% · Green 1.0%
Turnout73.6% of 90,990 electors
| Candidate | Party | Votes | % | 2021 | ± |
|---|---|---|---|---|---|
| Kristina Tesser Derksen | Liberal | 32,178 | 48.3% | 41.5% | +6.8 |
| Parm Gill | Conservative | 32,157 | 48.2% | 41.0% | +7.2 |
| Muhammad Riaz Sahi | New Democratic | 1,029 | 1.5% | 9.5% | −8.0 |
| Susan Doyle | Green | 672 | 1.0% | 2.6% | −1.6 |
2 further candidates, each under 1% of the vote
| Walter J. Hofman | People's | 475 | 0.7% |
| Shahbaz Mahmood Khan | Independent | 174 | 0.3% |
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
0.1 pts
Half the margin: the share that would have had to move from first to second.
Third place vs. the margin
1,029 votes
New Democratic took more than the 21-vote margin. True in 100 of 343 ridings in 2025.
Election-day polls won by others
104 of 176
1 poll ended in an exact tie.
Flip the seatHypothetical
It would have taken 11 voters switching from Liberal to Conservative — 0.02% of the 66,685 valid votes, 0.1 points — to change the result. No ballot was cast this way; this only moves votes between the top two.
Liberal32,178
Conservative32,157
Still Liberal by 21 votes. Actual margin: 21.
IVElection day versus advance
Only 54.6% of this riding's votes were cast at election-day polls. The rest were advance or special ballots. On election day alone, the Conservatives led here — the seat was decided by ballots cast before the day.
Election dayAdvance & specialGap
Conservative50.4%45.6%−4.8
Liberal45.4%51.6%+6.2
New Democratic1.8%1.2%−0.6
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.
VWhat kind of place this is
- Median total household income is $129,000 — about 1.5 times the median riding's $84,000.highestlowest6th highest of 343
- Median age is 38.0 — a little lower than the median riding's 41.6.highestlowest66th lowest of 343
- Share aged 25-64 with a bachelor's degree or higher is 43.7% — about 1.5 times the median riding's 28.2%.highestlowest73rd highest of 343
- Share who are immigrants is 33.4% — about 1.9 times the median riding's 17.3%.highestlowest85th highest of 343
- Share of households that own their home is 85.9% — about 1.2 times the median riding's 71.4%.highestlowest9th highest of 343
- Share with French as a mother tongue is 1.3% — about 81 percent of the median riding's 1.6%.highestlowest141st 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. 35060ON · 2025
Milton East—Halton Hills South
Kristina Tesser Derksen
- Result
- Liberal hold by 21
- Turnout
- 73.6%
- Population
- 116,730
- Area
- 257 km²
Closest race in CanadaHighest household incomeMost home ownersDecided before election day
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.