History: Life In The New York City, 19th Century, United States

Demographics
New York is the most populous city in the United States. In 2010, the U.S. Census Bureau estimated New York's population on July 1, 2009, to be 8,391,881 (up from 8.0 million in 2000 and 7.3 million in 1990). This amounts to about 40% of the state of New York's population and a similar percentage of the metropolitan regional population. Over the last decade the city has been growing rapidly and demographers estimate New York's population will reach between 9.2 and 9.5 million by 2030.
New York's two key demographic features are its density and ethnic diversity. In 2000, the city had an extremely high population density of 26,403 people per square mile (10,194/km²), about 10,000 more people per square mile than the next densest American city, San Francisco. As synonymous with New York County, Manhattan's population density is 66,940 people per square mile (25,846/km²), highest of any county in the United States.