Colorado is about 1,138 times bigger than Cook Islands.

Cook Islands is approximately 236 sq km, while Colorado is approximately 268,627 sq km, making Colorado 113,725% larger than Cook Islands. Meanwhile, the population of Cook Islands is ~8,128 people (5.0 million more people live in Colorado).
Tip: This to-scale comparison of Cook Islands vs. Colorado uses the Mercator projection, which distorts the size of regions near the poles.