Keith - Manhattan is in New York County. From wikipedia:
http://en.wikipedia.org/wiki/New_york_city
New York's five boroughs overview
Jurisdiction Population Land area
Borough of County of 1 July 2011
Estimates square miles square km
Manhattan New York 1,601,948 - 23 59
The Bronx Bronx 1,392,002 - 42 109
Brooklyn Kings 2,532,645 - 71 183
Queens Queens 2,247,848 - 109 283
Staten Island Richmond 470,467 - 58 151
City of New York 8,244,910 - 303 786
http://en.wikipedia.org/wiki/New_york_city
New York's five boroughs overview
Jurisdiction Population Land area
Borough of County of 1 July 2011
Estimates square miles square km
Manhattan New York 1,601,948 - 23 59
The Bronx Bronx 1,392,002 - 42 109
Brooklyn Kings 2,532,645 - 71 183
Queens Queens 2,247,848 - 109 283
Staten Island Richmond 470,467 - 58 151
City of New York 8,244,910 - 303 786