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Nassau County, New York

County in New York, United States

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Situated on western Long Island, the county 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, highway, and cultural connectivity. Nassau is considered one of the central counties within the New York metropolitan area.

The county comprises two cities, three towns, 64 incorporated villages, and more than 60 unincorporated hamlets. Nassau County has a designated police department, fire commission, and elected executive and legislative bodies.

A 2012 Forbes article based on the American Community Survey reported Nassau County as the most expensive county and one of the highest-income counties in the U.S., and the most affluent in New York state, with four of the nation's top ten towns by median household income located in the county. Housing costs and a lack of new housing supply to meet the exceptional demand have become a pressing concern for Nassau County. As of 2026, the median home price overall in Nassau is over US$900,000, while the Gold Coast of Nassau County features some of the world's most expensive real estate. Nassau has been ranked the safest county in the United States.

Nassau County high school students often feature prominently as winners of the International Science and Engineering Fair and similar STEM-based academic awards as well as top AI programs and U.S. schools lists. Cold Spring Harbor Laboratory in the Town of Oyster Bay; the Old Westbury campus of New York Institute of Technology; the second campus of the New York University Grossman School of Medicine in Mineola, Zucker School of Medicine in the Village of Hempstead; and the Feinstein Institutes for Medical Research in Manhasset, are prominent life sciences research and academic institutions in Nassau County. The presence of numerous prominent health care systems has made Nassau County a central hub for advanced medical care and technology. Eight cricket matches of the 2024 ICC Men's T20 World Cup were played at a temporary cricket stadium in Eisenhower Park in East Meadow in June 2024.

Etymology

The name of Nassau County originated from an old name for Long Island, which was at one time named Nassau, after the Dutch family of King William III of England, the House of Nassau, itself named after the German town of Nassau. The county colors (orange and blue) are also the colors of the House of Orange-Nassau.

Several alternate names had been considered for Nassau County, including "Bryant", "Matinecock" (a village within the county currently has that name), "Norfolk" (presumably because of its proximity to Suffolk County), and "Sagamore". However, "Nassau" had the historical advantage of having at one time been the name of Long Island itself, and was the name most mentioned after the new county was proposed in 1875.

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