Shanghai and New York City

Shanghai

From the Skyscraper Museum web site:

"Shanghai's population of 10 million in its central core compares to 8.25 million people in New York City's five boroughs. The average density of New York is 10,452 people per km2 (27,303 per sq. mi.) while greater Shanghai is 5,314 people per km2 (13,760 per sq. mi.). Shanghai is more dense than New York in its core, but half as dense overall."