<P> With a Census - estimated population of 7,869,820 in 2017 , constituting nearly 40 % of New York State 's population , Long Island is the most populated island in any U.S. state or territory , and the 18th-most populous island in the world ( ahead of Ireland , Jamaica , and Hokkaidō ) . Its population density is 5,595.1 inhabitants per square mile ( 2,160.3 / km ) . If Long Island geographically constituted an independent metropolitan statistical area , it would rank fourth most populous in the United States ; while if it were a U.S. state , Long Island would rank 13th in population and first in population density . Long Island is culturally and ethnically diverse , featuring some of the wealthiest and most expensive neighborhoods in the Western Hemisphere near the shorelines as well as working - class areas in all four counties . </P>
<P> With a Census - estimated population of 7,869,820 in 2017 , constituting nearly 40 % of New York State 's population , Long Island is the most populated island in any U.S. state or territory , and the 18th-most populous island in the world ( ahead of Ireland , Jamaica , and Hokkaidō ) . Its population density is 5,595.1 inhabitants per square mile ( 2,160.3 / km ) . If Long Island geographically constituted an independent metropolitan statistical area , it would rank fourth most populous in the United States ; while if it were a U.S. state , Long Island would rank 13th in population and first in population density . Long Island is culturally and ethnically diverse , featuring some of the wealthiest and most expensive neighborhoods in the Western Hemisphere near the shorelines as well as working - class areas in all four counties . </P>
what is the population of long island new york
what is the population of long island new york
7,869,820
7,869,820