Ellis Island is located in the New York Bay between New york and New Jersey.  From January 1, 1892 to 1954, over 8 million immigrants were processed into the United States through Ellis island. The Island is owned and operated by the U.S Park Service. The U.S. immigration Museum is located on the Island and is a big tourist attraction. More Info.

Subway:

Take the 1 train to South Ferry.
Take the 4,5 trains to Bowling Green.
Take the R, W trains to Whitehall Street.

To view train stops, click on train line below: