Atlanta is about 1.5 times smaller than Colorado Springs.

Colorado Springs (map shows its 11 named neighbourhoods; the area covers the whole city) is approximately 523 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 66.96% the size of Colorado Springs.
Tip: This to-scale comparison of Colorado Springs vs. Atlanta uses the Mercator projection, which distorts the size of regions near the poles.
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