Atlanta is about 2 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 98% larger than District of Columbia.
Tip: This to-scale comparison of District of Columbia vs. Atlanta uses the Mercator projection, which distorts the size of regions near the poles.
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