Port Washington is an affluent hamlet and census-designated place (CDP) in Nassau County, New York on the North Shore of Long Island. As of the United States 2010 Census, the community population was 15,846.
Port Washington is a hamlet within and directly governed by the town of North Hempstead. With rolling hills and a serpentine coastline in the northwest corner of Nassau County, Port Washington is studded with marinas, parks, yacht clubs, and golf courses. The Great Neck peninsula is across Manhasset Bay to the west; Manhasset and Plandome are to the south; Roslyn lies southeast. Besides an unincorporated area of the Town of North Hempstead, Port Washington is home to four incorporated villages: Baxter Estates, Manorhaven, Port Washington North and Sands Point, plus part of the village of Flower Hill.
According to Forbes, Port Washington is ranked as the 418th wealthiest ZIP code as of 2017, with a median home sale price of $1,323,271.
In the 1870s, Port Washington became an important sand-mining town; it had the largest sandbank east of the Mississippi and easy barge access to Manhattan. Some 140 million cubic yards of local sand were used for concrete for New York skyscrapers like the Empire State and Chrysler buildings, in addition to the New York City Subway, according to Jon Kaiman, the Town Supervisor until 2013. In 1998, the sand mines were redeveloped as Harbor Links, a golf course for North Hempstead residents.
The Thomas Dodge Homestead, Execution Rocks Light, Gould-Guggenheim Estate, William Landsberg House, Main Street School, Monfort Cemetery, Sands-Willets Homestead, and John Philip Sousa House are listed on the National Register of Historic Places.
In the late 1930s, prior to the opening of the Marine Air Terminal at LaGuardia Airport, Port Washington was Pan-American World Airways' New York base for their Yankee Clipper Boeing B-314 flying boats; the waters of Manhasset Bay were ideal for flying boat operations. Common destinations served included London, Southampton (UK), the Azores, and Bermuda.
According to the United States Census Bureau, the CDP has a total area of 5.6 square miles (15 km2), of which 4.2 square miles (11 km2) is land and 1.4 square miles (3.6 km2) (25.22%) is water.