Dusseldorf is about 2.1 times bigger than Paris.

Paris is approximately 105 sq km, while Dusseldorf is approximately 217 sq km, making Dusseldorf 106% larger than Paris.
Tip: This to-scale comparison of Paris vs. Dusseldorf 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.