Oklahoma is about 3.1 times bigger than Croatia.

Croatia is approximately 56,594 sq km, while Oklahoma is approximately 177,847 sq km, making Oklahoma 214% larger than Croatia. Meanwhile, the population of Croatia is ~4.2 million people (437,502 fewer people live in Oklahoma).
This to-scale comparison of Croatia vs. Oklahoma uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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