California is about 939 times bigger than Barbados.

Barbados is approximately 430 sq km, while California is approximately 403,882 sq km, making California 93,826% larger than Barbados. Meanwhile, the population of Barbados is ~302,674 people (37.0 million more people live in California).
Tip: This to-scale comparison of Barbados vs. California uses the Mercator projection, which distorts the size of regions near the poles.
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