Ottawa is about 4.7 times bigger than Chicago.

Chicago is approximately 590 sq km, while Ottawa is approximately 2,779 sq km, making Ottawa 371% larger than Chicago.
Tip: This to-scale comparison of Chicago vs. Ottawa 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.