Oklahoma is about 1.5 times smaller than Colorado.

Colorado is approximately 268,627 sq km, while Oklahoma is approximately 177,847 sq km, making Oklahoma 66.21% the size of Colorado. Meanwhile, the population of Colorado is ~5.0 million people (1.3 million fewer people live in Oklahoma).
This to-scale comparison of Colorado vs. Oklahoma uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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