District of Columbia is around the same size as Aruba.

Aruba is approximately 180 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 98.33% the size of Aruba. Meanwhile, the population of Aruba is ~122,320 people (479,403 more people live in District of Columbia).
Tip: This to-scale comparison of Aruba vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.
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