Puerto Rico is about 28 times smaller than Michigan.

Michigan is approximately 250,493 sq km, while Puerto Rico is approximately 9,104 sq km, making Puerto Rico 3.63% the size of Michigan. Meanwhile, the population of Michigan is ~9.9 million people (6.8 million fewer people live in Puerto Rico).
This to-scale comparison of Michigan vs. Puerto Rico uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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