Saint Lucia is about 188 times smaller than Pennsylvania.

Pennsylvania is approximately 116,075 sq km, while Saint Lucia is approximately 616 sq km, making Saint Lucia 0.53% the size of Pennsylvania. Meanwhile, the population of Pennsylvania is ~12.7 million people (12.5 million fewer people live in Saint Lucia).
Tip: This to-scale comparison of Pennsylvania vs. Saint Lucia uses the Mercator projection, which distorts the size of regions near the poles.