District of Columbia is about 27 times bigger than Gibraltar.

Gibraltar is approximately 7 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 2,623% larger than Gibraltar. Meanwhile, the population of Gibraltar is ~29,573 people (572,150 more people live in District of Columbia).
Tip: This to-scale comparison of Gibraltar vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.
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