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.
According to the United States Census Bureau, the CDP has a total area of 5.6 square miles (15 km), of which 4.2 square miles (11 km) is land and 1.4 square miles (3.6 km) (25.22%) is water.
As of the 2010 census, the population was 82.2% White 74.7% Non-Hispanic White, 2.4% African American, 0.2% Native American, 8% Asian, 0.0% Pacific Islander, 4.8% from other races, and 2.4% from two or more races. Hispanic or Latino people of any race were 13.4% of the population. The median income for households in Port Washington, New York is $117,647, while the mean household income is $174,069, excluding the data from the extremely wealthy hamlet of Sands Point.
As of the census of 2000, there were 15,215 people, 5,521 households, and 4,168 families residing in the CDP. The population density was 3,613.7 per square mile (1,395.4/km²). There were 5,662 housing units at an average density of 1,344.8/sq mi (519.3/km²). The racial makeup of the CDP was 85.97% White, 2.81% African American, 0.11% Native American, 6.07% Asian, 0.02% Pacific Islander, 3.15% from other races, and 1.86% from two or more races. Hispanic or Latino people of any race were 11.20% of the population.
There were 5,521 households, out of which 36.3% had children under the age of 18 living with them, 62.9% were married couples living together, and 24.5% were non-families. 20.4% of all households were made up of individuals, and 10.4% had someone living alone who was 65 years of age or older. The average household size was 2.73 and the average family size was 3.15.
In the CDP, the population was spread out, with 25.3% under the age of 18, 5.0% from 18 to 24, 28.3% from 25 to 44, 26.4% from 45 to 64, and 15.0% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 90.9 males. For every 100 females age 18 and over, there were 87.5 males.
The median income for a household in the CDP was $105,837 and the median income for a family was $122,646. Males had a median income of $91,024 versus $59,299 for females. The per capita income for the CDP was $53,815. About 3.1% of families and 4.7% of the population were below the poverty line, including 3.5% of those under age 18 and 5.0% of those age 65 or over.