Oklahoma is about 2.3 times smaller than California.

California is approximately 403,882 sq km, while Oklahoma is approximately 177,847 sq km, making Oklahoma 44.03% the size of California. Meanwhile, the population of California is ~37.3 million people (33.5 million fewer people live in Oklahoma).
This to-scale comparison of California vs. Oklahoma uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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