Chicago is about 5 times bigger than Bronx.

Bronx is approximately 109 sq km, while Chicago is approximately 590 sq km, making Chicago 440% larger than Bronx.
Tip: This to-scale comparison of Bronx vs. Chicago 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.