Roosevelt Island is a narrow island in New York City's East River. It lies between the island of Manhattan to its west and the borough of Queens to its east, and is part of the borough of Manhattan. Running from Manhattan's East 46th to East 85th Streets, it is about 2 miles (3.2 km) long, with a maximum width of 800 feet (240 m), and a total area of 147 acres (0.59 km2). Together with Mill Rock, Roosevelt Island constitutes Manhattan's Census Tract 238, which has a land area of 0.279 sq mi (0.72 km2).[1] and had a population of 9,520 in 2000 according to the US Census.[2] The Roosevelt Island Operating Corporation estimated its population was about 12,000 in 2007. (wikipedia caption)