Colorado is about 1.4 times bigger than South Dakota.

South Dakota is approximately 196,540 sq km, while Colorado is approximately 268,627 sq km, making Colorado 37% larger than South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (4.2 million more people live in Colorado).
This to-scale comparison of South Dakota vs. Colorado uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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