San Francisco is about 879 times bigger than Mall of America.

Mall of America is approximately 0.14 km² (0.053 sq mi), while San Francisco (including the city proper only) is approximately 121 sq km, making San Francisco 87,836% larger than Mall of America.
Tip: This to-scale comparison of Mall of America vs. San Francisco uses the Mercator projection, which distorts the size of regions near the poles.
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