Idaho is about 1.2 times smaller than Colorado.

Colorado is approximately 268,627 sq km, while Idaho is approximately 214,314 sq km, making Idaho 79.78% the size of Colorado. Meanwhile, the population of Colorado is ~5.0 million people (3.5 million fewer people live in Idaho).
This to-scale comparison of Colorado vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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