Colorado is about 1.4 times smaller than Montana.

Montana is approximately 376,979 sq km, while Colorado is approximately 268,627 sq km, making Colorado 71.26% the size of Montana. Meanwhile, the population of Montana is ~989,415 people (4.0 million more people live in Colorado).
This to-scale comparison of Montana vs. Colorado uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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