yes i think
Yes, Staten Island is part of New York City.
New York City's five boroughs were united under the charter of "Greater New York" on May 4, 1897. See the related link.
Its a borough of New York City
Yes, Roosevelt Island is officially considered to be part of the borough of Manhattan, and New York County (each of New York City's five boroughs is also a county, and Manhattan is New York County).
New York City is a part of New York State.
The city of New York, located in the southern part of New York State, is the most populated.
Manhattan is part of NYC, which in turn is part of New York State.
The zip code for Governor's Island (which is officially considered to be a part of Manhattan) is 10004.
At the Southern end.
NEW YORK
Yes, New York City is part of New York State, and New York State is part of the continental United States.