Wichita is about 1.2 times smaller than Warsaw.

Warsaw is approximately 517 sq km, while Wichita (map shows its 73 named neighbourhoods; the area covers the whole city) is approximately 428 sq km, making Wichita 82.66% the size of Warsaw.
Tip: This to-scale comparison of Warsaw vs. Wichita uses the Mercator projection, which distorts the size of regions near the poles.
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