Braunschweig is about 3.1 times smaller than Chicago.

Chicago is approximately 590 sq km, while Braunschweig is approximately 193 sq km, making Braunschweig 32.67% the size of Chicago.
Tip: This to-scale comparison of Chicago vs. Braunschweig uses the Mercator projection, which distorts the size of regions near the poles.
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