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Ontario

New Democratic Party





Last update: August 31, 2025

LeaderMarit Stiles
Popular vote in 202223.7%
Current vote projection15.8% ± 2.2%
Current number of MPP27
Current seat projection18 [10-23]

Seat projection Popular vote projection | August 31, 2025 30 25 20 15 10 5 12% 13% 14% 15% 16% 17% 18% 19% 20% 21% Vote efficiency | NDP 338Canada Ontario 3.7 seat/% 18 [10-23] 16% ± 2% 2018 2025
Note: The seats-per-vote function, or vote efficiency, is not a linear function, but can be approximated as one over narrow vote intervals.


Vote projection | August 31, 2025

11% 12% 13% 14% 15% 16% 17% 18% 19% 20% 18% 16% 14% 12% 10% 8% 6% 4% 2% Min. 13.6% 15.8% ± 2.2% Max. 18.0% 2025 18.6% Probabilities % NDP

Seat projection | August 31, 2025

2 7 12 17 22 27 9% 8% 7% 6% 5% 4% 3% 2% 1% Min. 10 18 Max. 23 2025 27 seats Probabilities % NDP

Ranked list of favourable electoral districts | New Democratic Party



Rank Electoral districts Current party Last projection Odds of winning
1. Toronto—Danforth Safe NDP >99%
2. Davenport Safe NDP >99%
3. Ottawa Centre Safe NDP >99%
4. Hamilton Centre Likely NDP 99%
5. Waterloo Likely NDP 99%
6. University—Rosedale Likely NDP 97%
7. Kiiwetinoong Likely NDP 97%
8. Ottawa West—Nepean Likely NDP 95%
9. Parkdale—High Park Likely NDP 95%
10. Spadina—Fort York Likely NDP 92%
11. Niagara Falls Likely NDP 90%
12. London North Centre Leaning NDP 70%
13. Toronto Centre Toss up OLP/NDP 70%
14. London West Toss up PCPO/NDP 67%
15. Scarborough Southwest Toss up PCPO/NDP 63%
16. London—Fanshawe Toss up PCPO/NDP 63%
17. Nickel Belt Toss up PCPO/NDP 57%
18. Windsor West Toss up PCPO/NDP 50%
19. Thunder Bay—Superior North Toss up PCPO/NDP 31%
20. Sudbury Toss up PCPO/NDP 30%
21. St. Catharines Leaning PCPO 27%
22. Timiskaming—Cochrane Leaning PCPO 24%
23. Hamilton West—Ancaster—Dundas Leaning PCPO 18%
24. Niagara Centre Leaning PCPO 16%
25. Mushkegowuk—James Bay Leaning PCPO 13%
26. Oshawa Leaning PCPO 12%
27. Humber River—Black Creek Likely PCPO 8%
28. Sault Ste. Marie Likely PCPO 2%