District of Columbia is about 172 times smaller than Belgium.

Belgium is approximately 30,528 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.58% the size of Belgium. Meanwhile, the population of Belgium is ~11.8 million people (11.2 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Belgium vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.
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