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 to… See more

The area now designated as Nassau County was originally the eastern 70% of Queens County, one of the original twelve counties formed in 1683, and was then contained within two towns: Hempstead and Oyster Bay. … See more

According to the U.S. Census Bureau, the county has a total area of 453.2 square miles (1,174 km ), of which 284.7 square miles (737 km ) is land and 168.5 square miles (436 km ) (37%) is water.
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At the 2019 American Community Survey, the population of Nassau County stood at 1,356,924, an increase of 17,392 since the 2010 census. At the 2010 U.S. census, there were 1,339,532 people, 448,528 households… See more