Nassau County, New York

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Nassau County
Hempstead House, part of Sands Point Preserve
Hempstead House, part of Sands Point Preserve
Map of New York highlighting Nassau County
Location within the U.S. state of New York
Map of the United States highlighting New York
New York's location within the U.S.
Coordinates: 40°44′50″N 73°38′17″W / 40.7472°N 73.6381°W / 40.7472; -73.6381
Country United States
State New York
Founded1899
Named forWilliam of Nassau
SeatMineola
Largest villageHempstead
Area
 • Total453 sq mi (1,170 km2)
 • Land285 sq mi (740 km2)
 • Water169 sq mi (440 km2)  37%%
Population
 • Estimate 
(2018)
1,358,343
 • Density4,766.1/sq mi (1,840.2/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional districts2nd, 3rd, 4th, 5th
Websitewww.nassaucountyny.gov
Population is 2018 Census estimate.

Nassau County is a suburban county in the New York Metropolitan area east of New York City and west of Suffolk County, in the U.S. state of New York. In 2000, 1,334,544 people lived there. It and Suffolk County are together referred to as Long Island. Until 1899 Nassau County was part of Queens County. Along with Suffolk, it was named the safest county in the United States in 2005 by Forbes magazine.