District of Columbia is about 29 times smaller than Delaware.

Delaware is approximately 5,060 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 3.5% the size of Delaware. Meanwhile, the population of Delaware is ~897,934 people (296,211 fewer people live in District of Columbia).
Tip: This to-scale comparison of Delaware vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.
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