California is about 5 times smaller than Greenland.

Greenland is approximately 2,166,086 sq km, while California is approximately 403,882 sq km, making California 18.65% the size of Greenland. Meanwhile, the population of Greenland is ~57,792 people (37.2 million more people live in California).
Tip: This to-scale comparison of Greenland vs. California uses the Mercator projection, which distorts the size of regions near the poles.
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