Marseille is about 2.5 times smaller than Chicago.

Chicago is approximately 590 sq km, while Marseille is approximately 241 sq km, making Marseille 40.8% the size of Chicago.
Tip: This to-scale comparison of Chicago vs. Marseille 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.