North Lindenhurst is a hamlet (and census-designated place) in Suffolk County, New York, United States. The population was 11,652 at the 2010 census. It is a community in the Town of Babylon. Most of North Lindenhurst is served by the Lindenhurst Post Office and School District, so it is usually considered a part of the Lindenhurst community.
North Lindenhurst is bordered by North Amityville to the west, East Farmingdale to the northwest, West Babylon to the northeast, and the Village of Lindenhurst to the south. Its coordinates are 40°42′25″N 73°23′6″W (40.706966, -73.385011).
According to the United States Census Bureau, the CDP has a total area of 1.9 square miles (4.9 km2), all land.
As of the census of 2010, there were 11,652 people and 3,787 households, with 3.09 persons per household in the CDP. The population density was 6,068.8 per square mile (2,391.2/km2).
There were 3,898 housing units, of which 23.8% were in multi-unit structures. The homeownership rate was 76.2%. The median value of owner-occupied housing units was $370,100.