Head of the Harbor is a village in Suffolk County, on the North Shore of Long Island, New York, United States. The population was 1,472 at the time of the 2010 census.

The Village of Head of the Harbor is located entirely within the Town of Smithtown. Despite this, the Northern part of the village is part of the Three Village Central School District in the Town of Brookhaven. On the border with Stony Brook Village, Head of the Harbor hosts the Avalon Nature Preserve; a privately owned memorial park of 216 acres consisting of trails and landmarks. Due to proximity, common, shared landmark, and heavy forestation, the North is seen as an extension of Stony Brook itself. It's this part of the village where Robert Mercer lives, owing to Renaissance Technologies' headquarters in Three Village.

Head of the Harbor incorporated as a village in 1928.

According to the United States Census Bureau, the village has a total area of 3.0 square miles (7.8 km), of which 2.8 square miles (7.3 km) is land and 0.2 square miles (0.52 km), or 7.52%, is water.

To the north of the village lies Stony Brook Harbor.

Historical population

Census	Pop.	Note	%±
1930	244		—
1940	255		4.5%
1950	334		31.0%
1960	524		56.9%
1970	943		80.0%
1980	1,023		8.5%
1990	1,354		32.4%
2000	1,447		6.9%
2010	1,472		1.7%
2020	1,520		3.3%
U.S. Decennial Census

At the 2000 census, there were 1,447 people, 484 households, and 413 families in the village. The population density was 513.6 inhabitants per square mile (198.3/km). There were 501 housing units at an average density of 177.8 per square mile (68.6/km). The racial makup of the village was 95.02% White, 1.24% African American, 3.25% Asian, and 0.48% from two or more races. Hispanic or Latino of any race were 1.38% of the population.

Of the 484 households 38.4% had children under the age of 18 living with them, 77.9% were married couples living together, 4.3% had a female householder with no spouse present, and 14.5% were non-families. 11.4% of households were one person and 3.5% were one person aged 65 or older. The average household size was 2.99 and the average family size was 3.23.

The age distribution was 27.0% under the age of 18, 5.2% from 18 to 24, 25.0% from 25 to 44, 31.2% from 45 to 64, and 11.6% 65 or older. The median age was 41 years. For every 100 females, there were 102.4 males. For every 100 women age 18 and over, there were 101.9 men.

The median household income was $117,450 and the median family income was $129,157. Males had a median income of $97,095 versus $50,481 for females. The per capita income for the village was $52,999. About 1.2% of families and 1.5% of the population were below the poverty line, including none of those under age 18 and 2.9% of those age 65 or over.

As of April 2024, the Mayor of Head of the Harbor is Michael Utevsky, the Deputy Mayor is Lisa Davidson, and the Village Trustees are Jeffrey D. Fischer, Judith C. Ogden, and Daniel White.

• Robert Mercer, billionaire hedge fund manager.

• Official website