The Town of Oyster Bay is the easternmost of the three towns which make up Nassau County, New York, in the United States. Part of the New York metropolitan area, it is the only town in Nassau County to extend from the North Shore to the South Shore of Long Island. As of the 2010 census, it had a population of 293,214.
The town of Oyster Bay extends from Long Island Sound in the north, south to the waters of South Oyster Bay and the Atlantic Ocean. It is bordered by the town of North Hempstead on the northwest and the town of Hempstead on the southwest. It is the easternmost of the three towns of Nassau County, with Suffolk County immediately to the east.
According to the United States Census Bureau, the town has a total area of 169.5 square miles (439 km), of which 104.4 square miles (270 km) is land and 65.1 square miles (169 km), or 38.42%, is water. As with most of Long Island, the north shore is hilly, the south shore has sandy beaches, and the area between is a plain.
Between the 1990 Census and the 2000 census, the town exchanged territory with the towns of Hempstead (Nassau County) and Babylon (Suffolk County). It also gained territory from the town of Huntington in Suffolk County.
As of the 2010 census the population was 85% White (80% Non-Hispanic White), 2.3% Black or African American, 0.2% Native American, 9.1% Asian, 0.0% Pacific Islander, 1.9% from other races, and 1.6% from two or more races. Hispanic or Latino of any race were 7.5% of the population.
As of the census of 2000, there were 293,925 people, 99,355 households, and 80,278 families residing in the town. The population density was 2,816.2 people per square mile (1,087.3/km²). There were 101,076 housing units at an average density of 968.4 per square mile (373.9/km²). The racial makeup of the town was 90.83% White, 1.64% Black or African American, 0.07% Native American, 4.85% Asian, 0.02% Pacific Islander, 1.36% from other races, and 1.23% from two or more races. Hispanic or Latino of any race were 5.06% of the population.
There were 99,355 households out of which 36.0% had children under the age of 18 living with them, 68.9% were married couples living together, 8.9% had a female householder with no husband present, and 19.2% were non-families. 16.1% of all households were made up of individuals and 8.5% had someone living alone who was 65 years of age or older. The average household size was 2.93 and the average family size was 3.27.
In the town, the population was spread out with 24.5% under the age of 18, 6.0% from 18 to 24, 28.7% from 25 to 44, 24.9% from 45 to 64, and 15.9% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 94.1 males. For every 100 females age 18 and over, there were 90.6 males.
According to a 2007 estimate, the median income for a household in the town was $99,873, and the median income for a family was $115,095. Males had a median income of $60,726 versus $39,420 for females. The per capita income for the town was $35,895. About 2.0% of families and 3.3% of the population were below the poverty line, including 3.0% of those under age 18 and 4.6% of those age 65 or over.