Saint Lucia is about 436 times smaller than Colorado.

Colorado is approximately 268,627 sq km, while Saint Lucia is approximately 616 sq km, making Saint Lucia 0.23% the size of Colorado. Meanwhile, the population of Colorado is ~5.0 million people (4.9 million fewer people live in Saint Lucia).
Tip: This to-scale comparison of Colorado vs. Saint Lucia uses the Mercator projection, which distorts the size of regions near the poles.