Central Park is about 35 times smaller than San Francisco.

San Francisco (including the city proper only) is approximately 121 sq km, while Central Park is approximately 3.41 km² (1.32 sq mi), making Central Park 2.82% the size of San Francisco.
Tip: This to-scale comparison of San Francisco vs. Central Park uses the Mercator projection, which distorts the size of regions near the poles.
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