Manhattan is an island borough of New York City, New York, USA, coterminous with New YorkCounty. With a 2000 population of 1,537,195 living in a land area of 22.96 square miles (59.47 km²), it is the most densely populated county in the United States at 66,940 residents per square mile (25,846/km²). The borough consists of Manhattan Island, Roosevelt Island, Randalls Island, almost 1/10th of Ellis Island, the above-water portion of Liberty Island, several much smaller islands, and a small section on the mainland adjacent to the Bronx.
Manhattan is the commercial, financial, and cultural center of the United States and, to varying extents, of the world.Manhattan has many famous landmarks, tourist attractions, museums, and universities. It is also home to the headquarters of the United Nations. Manhattan has the largest central business district in the United States, is the site of both the New York Stock Exchange and NASDAQ, and is the home to the largest number of corporate headquarters in the nation. It is indisputably the center of New York City and the New York metropolitan region, holding the seat of city government, and the largest fraction of employment, business, and recreational activities.