Serbia is about 2.3 times smaller than Oklahoma.

Oklahoma is approximately 177,847 sq km, while Serbia is approximately 77,474 sq km, making Serbia 43.56% the size of Oklahoma. Meanwhile, the population of Oklahoma is ~3.8 million people (3.0 million more people live in Serbia).
This to-scale comparison of Oklahoma vs. Serbia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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