As of the 2010 census, Long Island had a population of 7,568,304,
making it the most populated island in any U.S. state or territory. It is also the 17th most populous island in the world, ahead of Ireland, Jamaica and the Japanese island of Hokkaidō. Its population density is 5402 PD/sqmi.
If it were a state, Long Island would rank 13th in population (after Virginia) and first in population density.
Both the longest
and the largest island in the contiguous United States, Long Island extends 118 mi (189.9 km) eastward from New York Harbor to Montauk Point, and has a maximum north-to-south expanse of 23 mi (37 km) between the northern Long Island Sound coast and the southern Atlantic coast.
With a land area of 1,401 square miles (3,629 km2), Long Island is the 11th largest island in the United States, the 148th largest island in the world. It has a larger area than the state of Rhode Island (1,214 sq mi).
Nine bridges and 13 tunnels (including railway tunnels) connect Brooklyn and Queens (and thus Long Island) to the three other boroughs of New York City. Ferries connect Suffolk County northward across Long Island Sound to the state of Connecticut. Two of New York City's major airports, LaGuardia Airport and JFK International Airport, are located on Long Island, in Queens.