Colorado is about 1.6 times bigger than Washington.

Washington is approximately 172,348 sq km, while Colorado is approximately 268,627 sq km, making Colorado 56% larger than Washington. Meanwhile, the population of Washington is ~6.7 million people (1.7 million fewer people live in Colorado).
This to-scale comparison of Washington vs. Colorado uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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