Tennessee is about 173 times bigger than Saint Lucia.

Saint Lucia is approximately 616 sq km, while Tennessee is approximately 106,752 sq km, making Tennessee 17,230% larger than Saint Lucia. Meanwhile, the population of Saint Lucia is ~167,122 people (6.2 million more people live in Tennessee).
Tip: This to-scale comparison of Saint Lucia vs. Tennessee uses the Mercator projection, which distorts the size of regions near the poles.