Northern Mariana Islands is about 20 times smaller than Puerto Rico.

Puerto Rico is approximately 9,104 sq km, while Northern Mariana Islands is approximately 464 sq km, making Northern Mariana Islands 5.1% the size of Puerto Rico. Meanwhile, the population of Puerto Rico is ~3.1 million people (3.0 million fewer people live in Northern Mariana Islands).
This to-scale comparison of Puerto Rico vs. Northern Mariana Islands uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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