The Incorporated Village of Sea Cliff is a village located within the Town of Oyster Bay in Nassau County, New York. According to the United States 2010 Census, the village population was 4,995. The village is part of the North Shore School District.
Sea Cliff is located at 40°50′47″N 73°38′40″W / 40.846388°N 73.644526°W / 40.846388; -73.644526.
According to the United States Census Bureau, the village has a total area of 2.0 square miles (5.2 km), of which, 1.1 square miles (2.8 km) of it is land and 0.9 square miles (2.3 km) of it (44.67%) is water.
As of the 2010 census the population was 92.8% White, 88% Non-Hispanic white, 2.4% African American, 0.1% Native American, 1.9% Asian, 0.02% Pacific Islander, 0.95% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 6.8% of the population.
As of the census of 2000, there were 5,066 people, 2,013 households, and 1,356 families residing in the village. The population density was 4,655.1 people per square mile (1,794.5/km). There were 2,082 housing units at an average density of 1,913.1 per square mile (737.5/km). The racial makeup of the village was 94.83% White, 1.68% African American, 0.10% Native American, 1.22% Asian, 0.02% Pacific Islander, 0.95% from other races, and 1.20% from two or more races. Hispanic or Latino of any race were 4.76% of the population.
There were 2,013 households out of which 31.0% had children under the age of 18 living with them, 56.1% were married couples living together, 8.4% had a female householder with no husband present, and 32.6% were non-families. 26.6% of all households were made up of individuals and 9.4% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.06.
In the village, the population was spread out with 24.1% under the age of 18, 4.6% from 18 to 24, 27.9% from 25 to 44, 27.8% from 45 to 64, and 15.5% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 94.7 males. For every 100 females age 18 and over, there were 91.0 males.
The median income for a household in the village was $78,501, and the median income for a family was $100,576. Males had a median income of $65,469 versus $41,146 for females. The per capita income for the village was $41,707. About 2.1% of families and 2.8% of the population were below the poverty line, including 0.7% of those under age 18 and 10.6% of those age 65 or over.