Oklahoma is about 1.2 times smaller than Kansas.

Kansas is approximately 211,900 sq km, while Oklahoma is approximately 177,847 sq km, making Oklahoma 83.93% the size of Kansas. Meanwhile, the population of Kansas is ~2.9 million people (898,233 more people live in Oklahoma).
This to-scale comparison of Kansas vs. Oklahoma uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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