Atlanta is about 1.2 times smaller than Wichita.

Wichita (map shows its 73 named neighbourhoods; the area covers the whole city) is approximately 428 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 81.98% the size of Wichita.
Tip: This to-scale comparison of Wichita vs. Atlanta uses the Mercator projection, which distorts the size of regions near the poles.
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