What is the population of Islip CDP?

Islip CDP has 17,224 residents on Census ACS 2019-2023 ACS 5-year estimates, ranking #111 of 1,292 in New York.

What is the median household income in Islip CDP?

Median household income in Islip CDP is $122,596 a year, 56.1% above the national figure of $78,538.

How much does it cost to rent or buy in Islip CDP?

Median gross rent is $2,192 a month and the median home value is $486,900, so rent absorbs about 21.5% of median household income.

Is Islip CDP affordable compared with the rest of the US?

Homes cost about 4× the local median income here versus roughly 3.9× nationally, so Islip CDP is less affordable to buy in than the typical US market, and rent takes 21.5% of median income against the 30% cost-burden line.

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New York · Census place 37869

Islip, NY population, income and ZIP codes

Quick answer

The population of the city of Islip, New York (Islip, NY — Census place “Islip CDP”) is 17,224 residents, ranking #111 of 1292 places in New York. Median household income is $122,596, the median home is worth $486,900 and median gross rent runs $2,192 a month. Looking for the Islip New York ZIP code list? 1 ZIP codes serve Islip, NY: 11751.

Population: 17,224Islip CDP residents
Median household income: $122,596Past 12 months, inflation adjusted
Median home value: $486,900Owner-occupied units
Median gross rent: $2,192Rent plus utilities, monthly
Median age: 44 yrsAll residents
Homeownership rate: 84.5%Owner-occupied households

Islip ZIP codes (New York)

Census ZCTAs whose delivery area overlaps Islip.

The Islip NY ZIP code list below covers 1 ZIP code. Open any one for its population, income, housing and rent profile.

11751

What the numbers mean in Islip CDP

Housing cost measured against local earnings.

A household earning the Islip CDP median would spend about 21.5% of gross income on the median rent. The 30% mark is the federal threshold for cost burden, so anything above it signals a stretched rental market. The median home costs 4.0× the median household income; nationally that ratio sits near 4.5×. Poverty affects 5.8% of residents and 84.5% of households own their home.

Source: US Census Bureau, ACS 2019-2023 5-year estimates · rates as published for 2019-2023 ACS 5-year

Islip CDP, NY in context

How this area compares with national benchmarks.

Islip CDP is a mid-size town in New York, with 17,224 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #111 of 1,292 ranked by population — larger than 91% of them. The median age here is 44 years against 39.1 nationally, a slightly older profile than the country as a whole. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.

Households in Islip CDP earn a median of $122,596 a year, 56.1% above the national figure of $78,538 and 34% above the $91,806 median for the 847 New York cities we cover. The median is the midpoint household, not an average, so a handful of very high earners cannot drag it upward the way they distort a mean. Poverty reaches 5.8% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Islip CDP is valued at $486,900, 60.5% above the national figure and 54% above the $315,800 peer median, while median gross rent runs $2,192 a month, 55.9% above the national figure, or roughly $26,304 across a full year. A household on the local median income would put about 21.5% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is within the standard affordability guideline. The home-price-to-income ratio works out to 4×, against roughly 3.9× nationally, so buying is harder here than in the average US market. 84.5% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. Rent is reported gross — contract rent plus tenant-paid utilities — which is why it runs above the advertised price on a listing for the same unit.

Every value on this page is published directly by the Census for this area — nothing is modelled or interpolated. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.

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Frequently asked questions

Common questions about this area.

What is the population of Islip CDP?: Islip CDP has 17,224 residents on Census ACS 2019-2023 ACS 5-year estimates, ranking #111 of 1,292 in New York.
What is the median household income in Islip CDP?: Median household income in Islip CDP is $122,596 a year, 56.1% above the national figure of $78,538.
How much does it cost to rent or buy in Islip CDP?: Median gross rent is $2,192 a month and the median home value is $486,900, so rent absorbs about 21.5% of median household income.
Is Islip CDP affordable compared with the rest of the US?: Homes cost about 4× the local median income here versus roughly 3.9× nationally, so Islip CDP is less affordable to buy in than the typical US market, and rent takes 21.5% of median income against the 30% cost-burden line.
How current is this Islip CDP data?: All figures come from the US Census Bureau American Community Survey 2019-2023 ACS 5-year five-year estimates. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.