Nesconset is a hamlet and census-designated place (CDP) in Suffolk County, Long Island, New York, United States. The population was 13,387 at the 2010 census.GeographyNesconset is located at .According to the United States Census Bureau, the CDP has a total area of 3.8sqmi, all land.Demographics of the CDPAs of the census of 2000, there were 11,992 people, 3,964 households, and 3,226 families residing in the CDP. The population density was 3,133.5 per square mile (1,208.9/km²). There were 4,227 housing units at an average density of 1,104.5/sq mi (426.1/km²). The racial makeup of the CDP was 94.37% White, 0.96% African American, 0.11% Native American, 3.11% Asian, 0.07% Pacific Islander, 0.57% from other races, and 0.82% from two or more races. Hispanic or Latino of any race were 3.36% of the population.