Guam is about 17 times smaller than Puerto Rico.

Puerto Rico is approximately 9,104 sq km, while Guam is approximately 544 sq km, making Guam 5.98% the size of Puerto Rico. Meanwhile, the population of Puerto Rico is ~3.1 million people (2.9 million fewer people live in Guam).
This to-scale comparison of Puerto Rico vs. Guam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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