Potsdam is about 6 times smaller than Los Angeles.

Los Angeles (including the city proper only) is approximately 1,215 sq km, while Potsdam is approximately 188 sq km, making Potsdam 15.5% the size of Los Angeles.
Tip: This to-scale comparison of Los Angeles vs. Potsdam uses the Mercator projection, which distorts the size of regions near the poles.
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