Islip

County:: Suffolk County
County Seat:: No
Area (mi²):: 4.749
State:: New York

Islip is a CDP located in Suffolk County, New York. Islip has a 2025 population of 16,933. Islip is currently declining at a rate of -0.69% annually and its population has decreased by -0.19% since the most recent census, which recorded a population of 16,965 in 2020.

The average household income in Islip is $136,341 with a poverty rate of 5.77%.The median age in Islip is 44 years: 43.2 years for males, and 45.3 years for females.

Demographics

The racial composition of Islip includes 73.72% White, 5.81% other race, 5.28% Asian, 3.62% Black or African American, and smaller percentages for and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	12,697	73.72%
Two or more races	1,995	11.58%
Other race	1,000	5.81%
Asian	909	5.28%
Black or African American	623	3.62%

Islip Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Islip's average per capita income is $64,394. Household income levels show a median of $122,596. The poverty rate stands at 5.77%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$154,274	-
Families	$152,668	$158,979
Households	$122,596	$136,341
Non Families	$58,419	$68,406

$64,394

Average Income

$122,596

Median Household Income

5.77%

Poverty Rate