District of Columbia is about 64 times smaller than Gambia.

Gambia is approximately 11,300 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 1.57% the size of Gambia. Meanwhile, the population of Gambia is ~2.4 million people (1.8 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Gambia vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.
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