Nassau County is a suburban county located on Long Island, immediately to the east of New York City. As of the 2020 United States census, Nassau County's population was 1,395,774, making it the sixth-most populous county in the State of New York, and reflecting an increase of 56,242 from the 1,339,532 residents enumerated at the 2010 census. Its county seat is Mineola, while the county's largest town is Hempstead. Along with the remainder of Long Island, Nassau County lies in the southeastern portion of New York State. Situated on western Long Island, the County of Nassau borders New York City's borough of Queens to its west, and Long Island's Suffolk County to its east. It is the most densely populated and second-most populous county in the State of New York outside of New York City, with which it maintains extensive rail and highway connectivity, and is considered one of the central counties within the New York metropolitan area.

Founded: 1899
Named for: House of Nassau
Seat: Mineola
Largest town: Hempstead
Total: 453 sq mi (1,173.26 km²)
Land: 285 sq mi (738.15 km²)
Water: 169 sq mi (437.71 km²), 37
Density: 4,897.45/sq mi (auto/km²)
Area code(s): 516, 363
Time zone: Eastern: UTC-5-4
Website: [www.nassaucountyny.gov]
Twitter profile: nassauexecutive
Official Website: http://www.nassaucountyny.gov
Wikidata description: county in New York, United States
Wikidata id: Q54064
Wikidata label: Nassau County
Wikidata aliases: Array
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