Kings Park is a hamlet and census-designated place (CDP) in the Town of Smithtown, Suffolk County, New York, United States, on Long Island. The population was 17,282 as of the 2010 census. It is an unincorporated hamlet of Smithtown, New York
It is bordered by Nissequogue to its east across the Nissequogue River, by Fort Salonga to its west, by Commack to its southwest, and by the hamlet of Smithtown to its southeast. Kings Park is noted for its schools, numerous parks, and natural environment. Its relative tranquility prompted it to be the site of the Kings Park Psychiatric Center instead of New York City.
Kings Park is located at 40°53′19″N 73°14′33″W (40.888497, −73.242582).
According to the United States Census Bureau, the CDP has a total area of 6.6 square miles (17.1 km2), of which 6.2 square miles (16.1 km2) is land and 0.39 square miles (1.0 km2), or 5.93%, is water.
As of the census of 2010, there were 17,282 people and 6,212 households residing in the CDP. The population density was 2,787.4 per square mile (1,073.4/km2). There were 6,469 housing units at an average density of 1,043.4/sq mi (401.8/km2). The racial makeup of the CDP was 80.1% White, 5.1% African American, 0.1% Native American, 8.4% Asian, 0.02% Pacific Islander, 4.9% some other race, and 1.3% from two or more races. Hispanic or Latino of any race were 16.3% of the population.
There were 6,212 households in 2010, out of which 34.6% had children under the age of 18 living with them, 60.2% were headed by married couples living together, 9.4% had a female householder with no husband present, and 27.1% were non-families. 23.3% of all households were made up of individuals, and 12.1% were someone living alone who was 65 years of age or older. The average household size was 2.71, and the average family size was 3.24.
In the CDP, the population was spread out, with 23.3% under the age of 18, 6.6% from 18 to 24, 23.4% from 25 to 44, 29.4% from 45 to 64, and 17.2% who were 65 years of age or older.