Nassau County, New York
Not to be confused with Nassau (town), New York or Nassau (village), New York. Nassau County , New York County Hempstead House, part of Sands Point Preserve Flag Seal Location within the U.S. state of New York New York's location within the U.S. Founded 1899 Named for William of Nassau Government • Executive Laura Curran (D) Seat Garden City (Mineola mailing address) Largest village Hempstead Area • Total 453 sq mi (1,173 km 2 ) • Land 285 sq mi (738 km 2 ) • Water 169 sq mi (438 km 2 ), 37% Population (est.) • (2017) 1,369,514 • Density 4,805.3/sq mi (1,855.3/km 2 ) Congressional districts 2nd, 3rd, 4th, 5th Time zone Eastern: UTC−5/−4 Website www.nassaucountyny.gov Footnotes: Population is 2015 Census estimate. Interactive map of Nassau County, New York Part of a series of articles on Topics Geography History Economy Transportation Politics People Popular cult...