About this Ontario poll from Mainstreet Research
This Ontario poll was fielded by Mainstreet Research in September 2026, with a middle field date of September 29, 2026. The poll collected data from a total sample of n=1,203 Ontario respondents via IVR technology (automated calls).
The margin of error for an online sample is not applicable.
For comparison purposes, a random sample of this size would yield a margin of error [moe] of ±2.8%, 19 times out of 20 (for entire sample only) around the 50%-mark.
The regional breakdown of this poll was not made publicly available.
If we compare these national numbers with the previous poll from Mainstreet Research (May 2026), the Ontario PC Party is down one point (variation smaller than moe), the Ontario NDP climbs three points from 24% to 27%, and the Ontario Liberal Party loses five points from 31% to 26%.
You can read more information on this poll here.