Puerto Rico is about 15 times bigger than Saint Lucia.

Saint Lucia is approximately 616 sq km, while Puerto Rico is approximately 9,104 sq km, making Puerto Rico 1,378% larger than Saint Lucia. Meanwhile, the population of Saint Lucia is ~167,122 people (2.9 million more people live in Puerto Rico).
This to-scale comparison of Saint Lucia vs. Puerto Rico uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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