Plainview is a hamlet and census-designated place (CDP) located near the North Shore of Long Island in the town of Oyster Bay in Nassau County, New York, United States. The population of the CDP as of 2010 was 26,217. The Plainview post office has the ZIP code 11803.
Plainview is located at 40°46′48″N 73°28′46″W / 40.78000°N 73.47944°W / 40.78000; -73.47944 (40.779911, -73.479483).
According to the United States Census Bureau, the CDP has a total area of 5.7 square miles (15 km). Plainview is on the Nassau County side of the border with Suffolk County. On the Nassau side it borders the hamlets of Hicksville, Old Bethpage, Syosset, and Woodbury. On the Suffolk side, its primary border is with Melville, but also touches West Hills.
As of a 2010 census, there were 26,217 people; 8,963 households; and 7,396 families residing in the CDP. The population density was 4,573.0/sq mi (1,765.64/km). There were 9,281 housing units. The racial makeup of the CDP was 91.8% White, 7.5% Asian, and .07% from two or more races. Hispanic or Latino of any race were .03% of the population.
There were 8,963 households out of which 36.5% had children under the age of 18 living with them, 73.0% were married couples living together. 16.3% of all households were made up of individuals living alone, and 11.9% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.24. In the CDP, the population was spread out with 25.1% under the age of 18, 5.5% from 18 to 24, 26.0% from 25 to 44, 26.5% from 45 to 64, and 17.0% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 94.3 males. For every 100 females age 18 and over, there were 89.4 males.
According to a 2007 estimate, the median income for a household in the CDP was $126,045, and the median income for a family was $151,780. Males had a median income of $89,032 versus $61,480 for females. The per capita income for the CDP was $76,634. None of the families and 0.8% of the population were living below the poverty line, including no under eighteens and 0.7% of those over 64.