Northern Mariana Islands is about 250 times smaller than Pennsylvania.

Pennsylvania is approximately 116,075 sq km, while Northern Mariana Islands is approximately 464 sq km, making Northern Mariana Islands 0.4% the size of Pennsylvania. Meanwhile, the population of Pennsylvania is ~13.1 million people (13.0 million fewer people live in Northern Mariana Islands).
Tip: This to-scale comparison of Pennsylvania vs. Northern Mariana Islands uses the Mercator projection, which distorts the size of regions near the poles.
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