Dayton is about 3 times smaller than Montreal.

Montreal is approximately 432 sq km, while Dayton is approximately 145 sq km, making Dayton 33.5% the size of Montreal.
Tip: This to-scale comparison of Montreal vs. Dayton uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.