This is not correct as of 2024. In 2024, Ontario had a GDP of CAD 1.17B. [1] In USD, this is (at .73 exchange rate, which is favorable for these calculations) this comes to US 854B.
In 2024, the following US states had greater GDPs [2]: California, Texas, New York, Florida, Illinois, Pennsylvania, Ohio, Georgia, and tied with Washington. GDP growth in 2025 was worse for Ontario than these states, and it would be expected Ontarios' position to continue to decline.
[1] https://en.wikipedia.org/wiki/Ontario
[2] https://www.statista.com/statistics/248023/us-gross-domestic...
January 28th 2026: $1 USD = $1.36 CAD
Seems like the USD weakened against the CAD too no?
As stated above, the usage of more accurate figures would render Ontario with a lower GDP than more states.