District of Columbia is about 1.5 times bigger than Jersey.

Jersey is approximately 116 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 53% larger than Jersey. Meanwhile, the population of Jersey is ~102,146 people (499,577 more people live in District of Columbia).
Tip: This to-scale comparison of Jersey vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.
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