According to the U.S. Census Bureau, Syosset has a total area of 5.0 square miles (13 km2), all land.[2][3]
Syosset absorbed the hamlet and former CDP of Locust Grove for the 1990 census.[4] Furthermore, Syosset gained some territory between the 2000 census and 2010 census from Muttontown, and also lost some territory which was annexed to the Village of Laurel Hollow.[5]
As of the 2020 U.S. Census,[8] there were 19,259 people, 6,170 households, and 5,307 families residing in Syosset. The population density was 3,785.8 inhabitants per square mile (1,461.7/km2). There were 6,354 housing units at an average density of 1,274.5 per square mile (492.1/km2). The racial makeup of Syosset was 62.7% White, 1.0% African American, 0.4% Native American, 31.4% Asian, 0.00% Pacific Islander, 0.8% from other races, and 1.6% from two or more races. 4.1% are Hispanic or Latino of any race. Syosset, like many other places on the North Shore of Long Island, has a large Jewish population,[9] as well as a large number of residents of Italian and East Asian origin. 35.4% of the population spoke a language other than English at home, mostly Chinese or Korean.
There were 8,131 households, out of which 25.6% had children under the age of 18 living with them, 75.5% were married couples living together, 7.5% had a female householder with no husband present, and 14.4% were non-families. 12.6% of all households were made up of individuals, and 7.6% had someone living alone who was 65 years of age or older. The average household size was 3.05 and the average family size was 3.33.
In Syosset, the population was spread out, with 26.0% under the age of 18, 5.6% from 18 to 24, 26.3% from 25 to 44, 27.1% from 45 to 64, and 15.0% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 96.2 males. For every 100 females age 18 and over, there were 90.5 males.
The median income for a household in Syosset was $180,297, and the median income for a family was $223,508. Males had a median income of $109,742 versus $77,038 for females. The per capita income for Syosset was $78,230. About 1.6% of families and 2.8% of the population were below the poverty line, including 2.4% of those under age 18 and 4.3% of those age 65 or over. The median home value is $944,786, while the average listing price of a home in the CDP was $1,164,815.[10]
Alan S. Blinder, economist, Professor of Economics & Public Affairs at Princeton University, Vice Chairman of the Board of Governors of the Federal Reserve System 1994–1996, writer, author, and columnist
In Soapdish, Whoopi Goldberg's character reveals that Montana Moorhead was formerly Milton Moorhead of Syosset, Long Island.
In the Comedy Central show Review (season 1, episode 3) the viewer question about pancakes comes from "Nick from Syosset, New York".
In the 2021 television series Gossip Girl, the character Julien Calloway mentions that she turned down a sponsorship from a strip mall in Syosset in the first episode of season 1.
In Only Murders in the Building, the character Oliver Putnam mentions that he threw up in a pool at a wedding in Syosset.
Syosset is protected by the firefighters and EMTs of the Syosset Fire Department (SFD), which consists of five all-volunteer fire companies and one all-volunteer EMS company.[6] The Syosset Fire Department currently operates out of three fire stations, located throughout the area, which encompasses Syosset, Woodbury, and parts of Muttontown, Oyster Bay Cove, Laurel Hollow, Cold Spring Harbor, East Norwich, Jericho, Hicksville, and Plainview. At 14.4 square miles, it is the largest coverage area in Nassau County.[17] They operate a fire apparatus fleet of five engines, two trucks, one rescue, three ambulances, and several special, support, and reserve units.[17]
