Barcelona is about 7 times bigger than Key West.

Key West (area of Key West island) is approximately 14 sq km, while Barcelona is approximately 101 sq km, making Barcelona 645% larger than Key West.
Tip: This to-scale comparison of Key West vs. Barcelona 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.