Each borough in New York City is its own county. Acc. to Wikipedia:
New York City encompasses five counties, and is the county seat of all five of them: New York County (Manhattan), Kings County...
New York City is comprised of five boroughs: Manhattan, Queens, Brooklyn, the Bronx, and Staten Island. Manhattan=New York CountyThe Bronx=Bronx CountyBrooklyn=Kings CountyQueens=Queens CountyStaten...
The City of New York (comprising all five counties or "boroughs") is referred to as New York, NY. The island and borough of Manhattan is New York, NY. When you write a letter to someone in Manhattan,...
New York City is comprised of five boroughs: Manhattan, Brooklyn, Queens, The Bronx and Staten Island. Each borough is also a county: Manhattan is New York County, Brooklyn is Kings County, Staten...