New York City is about 5 times bigger than Pittsburgh.

Pittsburgh is approximately 143 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 445% larger than Pittsburgh.
Tip: This to-scale comparison of Pittsburgh vs. New York City uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.