Saint Lucia is about 183 times smaller than Louisiana.

Louisiana is approximately 112,825 sq km, while Saint Lucia is approximately 616 sq km, making Saint Lucia 0.55% the size of Louisiana. Meanwhile, the population of Louisiana is ~4.5 million people (4.4 million fewer people live in Saint Lucia).
Tip: This to-scale comparison of Louisiana vs. Saint Lucia uses the Mercator projection, which distorts the size of regions near the poles.