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

Colorado is approximately 268,627 sq km, while Cook Islands is approximately 236 sq km, making Cook Islands 0.09% the size of Colorado. Meanwhile, the population of Colorado is ~5.0 million people (5.0 million fewer people live in Cook Islands).
Tip: This to-scale comparison of Colorado vs. Cook Islands uses the Mercator projection, which distorts the size of regions near the poles.