Oceanside is a hamlet and census-designated place (CDP) located in the southern part of the town of Hempstead, Nassau County, New York. The population was 32,109 at the 2010 census.
Oceanside is located at 40°38′11″N 73°38′15″W / 40.63639°N 73.63750°W / 40.63639; -73.63750 (40.636286, -73.637404).
The Town was built over swampland spanning from the early 1900s to the late 1970s. Most of the town before this, was a small sea port near the more established villages of Rockville Centre, Baldwin, and East Rockaway. The area of the town increased exponentially and its population would boom to nearly 30,000 people by the end of the 1990s.
According to the United States Census Bureau, the community has a total area of 5.4 square miles (14 km), of which 5.0 square miles (13 km) is land and 0.4 square miles (1.0 km), or 7.38%, is water.
As of the 2010 census the population was 92.2% White, 85.9% Non-Hispanic White 1.7% African American, 0.1% Native American, 2.7% Asian, 0.0% Pacific Islander, 2.4% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 9.2% of the population.
As of the census of 2000, there were 32,733 people, 11,224 households, and 9,125 families residing in the area. The population density was 6,523.6 per square mile (2,517.6/km). There were 11,396 housing units at an average density of 2,271.2/sq mi (876.5/km). The racial makeup of the CDP was 94.95% White, 0.56% African American, 0.07% Native American, 1.83% Asian, 0.01% Pacific Islander, 1.58% from other races, and 1.00% from two or more races. Hispanic or Latino of any race were 5.90% of the population.
There were 11,224 households out of which 36.9% had children under the age of 18 living with them, 69.5% were married couples living together, 8.8% had a female householder with no husband present, and 18.7% were non-families. 16.1% of all households were made up of individuals and 9.1% had someone living alone who was 65 years of age or older. The average household size was 2.90 and the average family size was 3.25.
In the community, the population was spread out with 25.0% under the age of 18, 6.1% from 18 to 24, 27.6% from 25 to 44, 25.7% from 45 to 64, and 15.6% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 93.7 males. For every 100 females age 18 and over, there were 89.5 males.
According to a 2007 estimate, the median income for a household in the community was $100,167, and the median income for a family was $109,937. Males had a median income of $55,652 versus $40,163 for females. The per capita income for the CDP was $30,245. About 2.8% of families and 3.5% of the population were below the poverty line, including 3.8% of those under age 18 and 3.9% of those age 65 or over.