North Massapequa is a hamlet and census-designated place (CDP) located on Long Island within the Town of Oyster Bay in Nassau County, on Long Island, in New York, United States.

[2] According to the United States Census Bureau, the CDP has a total area of 3.0 square miles (7.8 km2), all land.

[3] As of the census[5] of 2000, there were 19,152 people, 6,281 households, and 5,288 families residing in the CDP.

There were 6,333 housing units at an average density of 2,094.1 per square mile (808.5/km2).

13.2% of all households were made up of individuals, and 7.8% had someone living alone who was 65 years of age or older.