Census-designated place · New York
Islip, New York
Islip, census-designated place, in Suffolk County, New York. Islip had 17,362 people in the ACS 2020-2024 5-year estimates (±1,043). GEOID 3637869.
Residents, 2020-2024
17,362
±1,043 (90% margin)
2020 Census count: 18,418
Median household income
$120,909
±$16,304 (90% margin)
New York: $85,974
Median home value
$542,200
±$31,529 (90% margin)
New York: $423,800
Median gross rent
$2,235
±$100 (90% margin)
New York: $1,621
Where is Islip and what county is it in?
Islip is a census-designated place: an unincorporated community the Census Bureau draws for counting, with no city government of its own, in Suffolk County, New York. It covers 4.7 square miles of land, 3,878 residents per square mile in 2020.
Islip is in the New York-Newark-Jersey City, NY-NJ metropolitan statistical area, which takes in 22 counties (Census Bureau delineation, July 2023).
Islip lies entirely within the Town of Islip, a town with its own local government (2020 census blocks).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Islip, and is it growing?
The 2020-2024 American Community Survey puts Islip's population at 17,362 (±1,043). The 2020 Census counted 18,418 residents.
The Census Bureau publishes yearly population estimates for incorporated places only; Islip is a census-designated place, so its figures come from the ACS and the 2020 Census.
| Measure | Islip | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 17,362 ±1,043 | 1,530,146 | no clear change |
| Households | 6,036 ±395 | 512,565 | no clear change |
| Average household size | 2.86 ±0.16 | 2.93 | no clear change |
| Housing units | 6,388 ±403 | 580,772 | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Islip?
The median resident of Islip is 43.9 years old; 19.8% are under 18 and 19.1% are 65 or older. The largest group is non-Hispanic white residents at 68.3%, then Hispanic or Latino residents (of any race) at 20.9%. 11.2% of residents were born outside the United States.
| Measure | Islip | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 43.9 ±2.5 | 41.7 | no clear change |
| Under 18 years | 19.8% ±2.0 pts | 20.8% | – |
| 65 years and over | 19.1% ±3.0 pts | 17.9% | – |
| Male | 49.8% ±2.6 pts | 49.6% | – |
| Hispanic or Latino (any race) | 20.9% ±5.3 pts | 22.8% | no clear change |
| White alone, not Hispanic | 68.3% ±5.8 pts | 62.0% | no clear change |
| Black or African American alone, not Hispanic | 3.1% ±1.6 pts | 6.9% | no clear change |
| Asian alone, not Hispanic | 5.5% ±3.0 pts | 4.4% | +4.0 pts |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.2 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.2 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.1% ±1.1 pts | 3.0% | – |
| Some other race alone, not Hispanic | 0.1% ±0.2 pts | 0.7% | – |
| Born outside the United States | 11.2% ±3.6 pts | 16.8% | no clear change |
| Speak a language other than English at home (age 5+) | 16.8% ±4.8 pts | 24.8% | – |
| Civilian veterans (age 18+) | 2.8% ±0.9 pts | 4.0% | – |
| With a disability | 12.5% ±2.8 pts | 10.5% | – |
| No health insurance coverage | 3.0% ±1.0 pts | 4.7% | no clear change |
| High school graduate or higher (age 25+) | 86.6% ±5.4 pts | 90.4% | – |
| Bachelor's degree or higher (age 25+) | 34.3% ±4.0 pts | 40.2% | no clear change |
| Graduate or professional degree (age 25+) | 13.1% ±2.1 pts | 18.6% | – |
| Lived in the same house a year earlier | 91.3% ±2.4 pts | 92.8% | – |
| Moved from another state in the past year | 1.2% ±1.5 pts | 0.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Islip earn?
Half of Islip's 6,036 households earn less than $120,909 a year (±$16,304), against $130,686 in Suffolk County and $85,974 in New York. In 2015-2019 it was $135,853 in 2024 dollars; the margins of error cannot tell the two periods apart. 5.7% of residents live below the poverty line.
| Measure | Islip | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $120,909 ±$16,304 | $130,686 | no clear change |
| Mean household income | $137,397 ±$8,936 | $166,220 | – |
| Per capita income | $49,053 ±$3,176 | $57,164 | −$6,626 |
| People below the poverty line | 5.7% ±1.8 pts | 6.4% | no clear change |
| Children under 18 below the poverty line | 5.7% ±3.3 pts | 7.1% | – |
| Households receiving SNAP | 6.9% ±2.4 pts | 7.2% | – |
| Households with a computer | 90.3% ±6.0 pts | 96.5% | – |
| Households with a broadband subscription | 87.1% ±6.0 pts | 93.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Islip?
Owners occupy 84.9% of Islip's occupied homes and renters 15.1%. The median owner-occupied home is valued at $542,200 by its owner (±$31,529). The median renter pays $2,235 a month including utilities, and 64.2% of renters pay 35% or more of their income on rent.
| Measure | Islip | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $542,200 ±$31,529 | $578,400 | +$76,259 |
| Median gross rent | $2,235 ±$100 | $2,255 | no clear change |
| Renters paying 35% or more of income on rent | 64.2% ±12.6 pts | 49.0% | no clear change |
| Median monthly owner costs, with a mortgage | $3,135 ±$181 | $3,320 | – |
| Owner-occupied homes | 84.9% ±4.0 pts | 82.2% | no clear change |
| Renter-occupied homes | 15.1% ±4.0 pts | 17.8% | – |
| Housing units | 6,388 ±403 | 580,772 | no clear change |
| Homeowner vacancy rate | 1.1% ±1.1 pts | 0.6% | – |
| Rental vacancy rate | 10.6% ±11.3 pts | 4.1% | – |
| Single-family detached homes | 72.8% ±4.5 pts | 79.7% | – |
| Mobile homes | 1.7% ±1.6 pts | 1.3% | – |
| Built 2020 or later | 0.4% ±0.5 pts | 0.7% | – |
| Built 2010 to 2019 | 0.1% ±0.2 pts | 3.7% | – |
| Built 1939 or earlier | 16.3% ±3.2 pts | 9.1% | – |
| Households with no vehicle | 6.5% ±4.8 pts | 5.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Islip work and get to work?
78.1% of Islip's workers drive alone and 10.2% work from home. The average trip to work takes 27.9 minutes. The unemployment rate in 2020-2024 averaged 5.8%.
| Measure | Islip | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 64.3% ±2.7 pts | 65.5% | – |
| Unemployment rate | 5.8% ±2.6 pts | 4.7% | no clear change |
| Drove alone to work | 78.1% ±3.3 pts | 72.1% | – |
| Carpooled | 7.2% ±2.1 pts | 7.5% | – |
| Public transportation | 2.5% ±1.1 pts | 4.8% | – |
| Walked | 1.3% ±0.9 pts | 1.4% | – |
| Worked from home | 10.2% ±1.9 pts | 12.0% | +6.2 pts |
| Mean travel time to work | 27.9 min ±1.7 | 31.1 min | −3.9 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Islip?
5 census tracts lie mostly in Islip (2020 census blocks). Their median household incomes run from $105,667 (Tract 1474.01) to $137,870 (Tract 1462.06).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 1474.01Suffolk County | 6,146 | $105,667 |
| Tract 1461.03Suffolk County | 4,023 | $131,408 |
| Tract 1474.02Suffolk County | 3,144 | $133,977 |
| Tract 1462.06Suffolk County | 2,073 | $137,870 |
| Tract 1462.05Suffolk County | 1,976 | $119,205 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Islip) · Census block assignment files
How does Islip compare with other places in New York?
Islip ranks 325th of 1,623 places in New York with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population (ACS 2020-2024) | 198th | 1,657 |
| Residents per square mile | 198th | 1,657 |
| Median household income | 325th | 1,623 |
| Per capita income | 592nd | 1,653 |
| Median home value | 305th | 1,637 |
| Median gross rent | 188th | 1,515 |
| Poverty rate | 1,076th | 1,331 |
| Bachelor's degree or higher | 753rd | 1,640 |
| Median age | 767th | 1,654 |
| Owner-occupied share | 532nd | 1,639 |
| Work from home | 891st | 1,350 |
| Travel time to work | 660th | 1,652 |
Islip's figures with every place in New York (CSV)
Every place in New York, sortable · Compare Islip with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Islip?
11 of the 57 figures for Islip on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Islip are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.