Michigan is about 407 times bigger than Saint Lucia.

Saint Lucia is approximately 616 sq km, while Michigan is approximately 250,493 sq km, making Michigan 40,564% larger than Saint Lucia. Meanwhile, the population of Saint Lucia is ~167,122 people (9.7 million more people live in Michigan).
Tip: This to-scale comparison of Saint Lucia vs. Michigan uses the Mercator projection, which distorts the size of regions near the poles.