Louisiana is about 478 times bigger than Cook Islands.

Cook Islands is approximately 236 sq km, while Louisiana is approximately 112,825 sq km, making Louisiana 47,707% larger than Cook Islands. Meanwhile, the population of Cook Islands is ~8,128 people (4.5 million more people live in Louisiana).
Tip: This to-scale comparison of Cook Islands vs. Louisiana uses the Mercator projection, which distorts the size of regions near the poles.