New York City is about 8 times bigger than Rochester.

Rochester is approximately 93 sq km, while New York City (including all five boroughs: Manhattan, Brooklyn, Queens, The Bronx, and Staten Island) is approximately 781 sq km, making New York City 743% larger than Rochester.
Tip: This to-scale comparison of Rochester vs. New York City uses the Mercator projection, which distorts the size of regions near the poles.
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