According to The New York Times coronavirus report, as of Sunday, April 19, 2:48 p.m. Eastern Standard Time, there were 35,676 COVID-19 deaths in the United States. Of those deaths, 18,690 were in the New York metropolitan area.
(The New York metropolitan area is generally regarded as consisting of the five boroughs of New York City, the five New York State counties surrounding New York City — Nassau, Suffolk, Westchester, Rockland and Orange — and the populous parts of New Jersey and Connecticut.)
That means that more than half (52%) of all deaths in America have occurred in the New York metropolitan area.