Marble Hill is in Cambridge.
The community boards of the New York City government are the appointed advisory groups of the community districts of the five boroughs . Manhattan ( [ mænˈhætən ] , [ mənˈhætən ] ) is the most densely populated borough of New York City , its economic and administrative center , and the city 's historical birthplace . Marble Hill, Manhattan . Politically a part of Manhattan and New York County , Marble Hill became an island in the Harlem River when it was separated from the island of Manhattan by the construction of the Harlem Ship Canal in 1895 .