Oklahoma is about 1.2 times bigger than Iowa.

Iowa is approximately 144,701 sq km, while Oklahoma is approximately 177,847 sq km, making Oklahoma 23% larger than Iowa. Meanwhile, the population of Iowa is ~3.0 million people (704,996 more people live in Oklahoma).
This to-scale comparison of Iowa vs. Oklahoma uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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