Mattituck

As of the 2020 census, Mattituck had a population of 4,322 people residing in 2,527 households and 1,963 families. The population density was 485.7 inhabitants per square mile (187.5/km²), with 2,313 housing units at an average density of 267.6 per square mile (103.3/km²). The racial makeup of the hamlet was 96.62% White, 1.17% African American, 0.02% Native American, 0.52% Asian, 0.64% from other races, and 1.02% from two or more races. Hispanics or Latinos of any race comprised 2.55% of the population.

Regarding households, 31.9% had children under 18 living with them, 62.4% were married couples, 9.4% had a female householder with no husband present, and 25.4% were non-families. 21.8% of households consisted of individuals, with 12.2% being individuals aged 65 or older. The average household size was 2.53, and the average family size was 2.97.

The age distribution in the community was as follows: 23.2% under 18, 5.6% between 18 and 24, 25.0% between 25 and 44, 27.1% between 45 and 64, and 19.1% aged 65 or older. The median age was 42 years. For every 100 females, there were 92.9 males, and for every 100 females age 18 and over, there were 88.9 males.

Regarding income, the median household income was $55,353, and the median family income was $63,370. Median income for males was $42,917 versus $34,813 for females. The per capita income for the CDP was $26,101. Approximately 4.5% of families and 5.6% of the population were below the poverty line, including 5.7% of those under age 18 and 9.6% of those age 65 or over.

Residents of Mattituck, Cutchogue, and Laurel attend the Mattituck-Cutchogue Union Free School District, whose sports teams are known as the Tuckers.