Claim: New York's most populous county is New York City.
Evidence: The state of New York , with an estimated 19.8 million residents in 2015 , is also referred to as New York State to distinguish it from New York City , the state 's most populous city and its economic hub.
Situated on one of the world 's largest natural harbors , New York City consists of five boroughs , each of which is a separate county of New York State.