Dominican Republic is about 275 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Dominican Republic is approximately 48,670 sq km, making Dominican Republic 27,397% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (10.1 million more people live in Dominican Republic).
Tip: This to-scale comparison of District of Columbia vs. Dominican Republic uses the Mercator projection, which distorts the size of regions near the poles.
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