New York City is about 4.3 times bigger than San Jose.

San Jose is approximately 180 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 334% larger than San Jose.
Tip: This to-scale comparison of San Jose vs. New York City uses the Mercator projection, which distorts the size of regions near the poles.