Long Island County is a county located in the U.S. state of New York. It is composed of four counties: Suffolk, Nassau, Kings, and Queens. Suffolk is the easternmost and largest of the four counties, with a population of 1.5 million people. Nassau is the second largest county, with a population of 1.4 million people. Kings is the third largest county, with a population of 2.6 million people. Queens is the fourth largest county, with a population of 2.3 million people. All four counties are part of the New York City metropolitan area.