Manhattan, US
Aerial view over the Upper East Side of Manhattan. (Stan Honda/AFP/Getty Images)
Considered the economic and cultural center of New York, Manhattan has 2012 population of 1,619,090, according to the Census Bureau. The population lives in a land area of 22.96 square miles (59.5 sq km), or 69,464 residents per square mile (26,924/sq km), more dense than any individual American city. During the day, commuters from other New York City boroughs and outside the city double Manhattan's population to 3.1 million, according to the New York Times. Recently, New York City Mayor Michael Bloomberg announced plans for protecting the city against climate change and rising seas. Recommendations included installing removable flood walls in lower Manhattan, according to the Associated Press.
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