California is about 21 times bigger than New Jersey.

New Jersey is approximately 19,211 sq km, while California is approximately 403,882 sq km, making California 2,002% larger than New Jersey. Meanwhile, the population of New Jersey is ~8.8 million people (28.5 million more people live in California).
This to-scale comparison of New Jersey vs. California uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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