California is about 5,178 times bigger than Guernsey.

Guernsey is approximately 78 sq km, while California is approximately 403,882 sq km, making California 517,697% larger than Guernsey. Meanwhile, the population of Guernsey is ~67,491 people (37.2 million more people live in California).
This to-scale comparison of Guernsey vs. California uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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