Saint Lucia is about 197 times smaller than Mississippi.

Mississippi is approximately 121,489 sq km, while Saint Lucia is approximately 616 sq km, making Saint Lucia 0.51% the size of Mississippi. Meanwhile, the population of Mississippi is ~3.0 million people (2.8 million fewer people live in Saint Lucia).
Tip: This to-scale comparison of Mississippi vs. Saint Lucia uses the Mercator projection, which distorts the size of regions near the poles.