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is a hamlet (and census-designated place) located in the Town of Oyster Bay, Nassau County, New York, USA. The population was 27,677 as of 2007. The Plainview Post Office has the ZIP Code 11803.
Plainview and its neighboring hamlet, Old Bethpage, share a school system, library, fire department, and water district. Law enforcement for the communities is provided by the Nassau County Police Department, with the Second Precinct serving areas north of Old Country Road and Eighth Precinct serving areas south of Old Country Road. Both hamlets vote in the 2nd congressional district of New York.
According to the United States Census Bureau, the CDP has a total area of 5.7 square miles (14.8 km²), all land. Plainview is located in the middle of Long Island, bordering Suffolk County.
The Long Island Expressway (I-495) and Northern State Parkway pass across the northern part of Plainview. NY-135 (Seaford-Oyster Bays Expressway) is a north-south route.