Brooklyn is about 3.3 times smaller than Chicago.

Chicago is approximately 590 sq km, while Brooklyn is approximately 180 sq km, making Brooklyn 30.46% the size of Chicago.
Tip: This to-scale comparison of Chicago vs. Brooklyn 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.