New Jersey is about 31 times bigger than Saint Lucia.

Saint Lucia is approximately 616 sq km, while New Jersey is approximately 19,211 sq km, making New Jersey 3,019% larger than Saint Lucia. Meanwhile, the population of Saint Lucia is ~167,122 people (8.6 million more people live in New Jersey).
Tip: This to-scale comparison of Saint Lucia vs. New Jersey uses the Mercator projection, which distorts the size of regions near the poles.