Town · New York
Town of Islip, New York
Islip (town), town, in Suffolk County, New York. Islip (town) had 340,867 residents on July 1, 2025 by the Census Bureau's estimate, up 0.3% since 2020; the 2020 Census counted 339,938 and the ACS 2020-2024 5-year estimates put it at 339,106 (±46). GEOID 3610338000.
Residents, July 2025 estimate
340,867
Census Bureau estimate (no margin published)
2020 Census count: 339,938 · ACS 2020-2024: 339,106 ±46
Median household income
$130,132
±$2,573 (90% margin)
New York: $85,974
Median home value
$535,300
±$6,786 (90% margin)
New York: $423,800
Median gross rent
$2,209
±$47 (90% margin)
New York: $1,621
Where is Islip (town) and what county is it in?
Islip (town) is a town in Suffolk County, New York. It covers 103.2 square miles of land, 3,294 residents per square mile in 2020.
23 places lie inside the Town of Islip, the largest Central Islip (CDP, 36,714 residents in 2020); 3 places lie partly in it.
- Central Islip CDP, 36,714 in 2020
- Bay Shore CDP, 29,244 in 2020
- West Islip CDP, 27,048 in 2020
- Holbrook CDP, 26,487 in 2020
- North Bay Shore CDP, 19,619 in 2020
- Ronkonkoma CDP, 18,955 in 2020
- Islip CDP, 18,418 in 2020
- Sayville CDP, 16,569 in 2020
- East Islip CDP, 13,931 in 2020
- Bohemia CDP, 9,852 in 2020
- Bayport CDP, 8,609 in 2020
- Baywood CDP, 7,726 in 2020
- Oakdale CDP, 7,430 in 2020
- Islip Terrace CDP, 5,323 in 2020
- West Sayville CDP, 4,872 in 2020
- West Bay Shore CDP, 4,625 in 2020
- North Great River CDP, 4,266 in 2020
- Islandia village, 3,567 in 2020
- Brightwaters village, 3,181 in 2020
- Great River CDP, 2,005 in 2020
- Ocean Beach village, 153 in 2020
- Saltaire village, 113 in 2020
- Captree CDP, 48 in 2020
- Hauppauge CDP, partly in the town
- Holtsville CDP, partly in the town
- Fire Island CDP, partly in the town
Islip (town) is in the New York-Newark-Jersey City, NY-NJ metropolitan statistical area, which takes in 22 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Islip (town), and is it growing?
The Census Bureau estimates that 340,867 people lived in Islip (town) on July 1, 2025, up 0.3% since 2020, while New York shrank 1.0%. The 2020 Census counted 339,938 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 339,106 (±46).
| Measure | Islip (town) | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 339,106±46 | 1,530,146 | +7,607 |
| Households | 102,205±1,535 | 512,565 | +3,866 |
| Average household size | 3.28±0.05 | 2.93 | no clear change |
| Housing units | 109,533±1,498 | 580,772 | no clear change |
Islip (town)'s population since 2000
From 322,612 in 2000 to 340,867 in 2025: up 5.7%. The 2000, 2010 and 2020 figures are census counts, each for Islip (town) as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
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 (town)?
The median resident of Islip (town) is 39.2 years old; 22.2% are under 18 and 15.2% are 65 or older. The largest group is non-Hispanic white residents at 47.3%, then Hispanic or Latino residents (of any race) at 37.8%. 23.2% of residents were born outside the United States.
| Measure | Islip (town) | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.2±0.6 | 41.7 | +0.8 |
| Under 18 years | 22.2%±0.5 pts | 20.8% | – |
| 65 years and over | 15.2%±0.4 pts | 17.9% | – |
| Male | 50.2%±0.5 pts | 49.6% | – |
| Hispanic or Latino (any race) | 37.8%±1.2 pts | 22.8% | +5.8 pts |
| White alone, not Hispanic | 47.3%±1.2 pts | 62.0% | −7.0 pts |
| Black or African American alone, not Hispanic | 7.9%±0.5 pts | 6.9% | −1.0 pts |
| Asian alone, not Hispanic | 3.6%±0.6 pts | 4.4% | +0.8 pts |
| American Indian and Alaska Native alone, not Hispanic | 0.1%±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.4%±0.4 pts | 3.0% | – |
| Some other race alone, not Hispanic | 0.9%±0.2 pts | 0.7% | – |
| Born outside the United States | 23.2%±1.0 pts | 16.8% | +2.1 pts |
| Speak a language other than English at home (age 5+) | 36.6%±1.1 pts | 24.8% | – |
| Civilian veterans (age 18+) | 3.3%±0.2 pts | 4.0% | – |
| With a disability | 10.2%±0.4 pts | 10.5% | – |
| No health insurance coverage | 7.0%±0.5 pts | 4.7% | +1.3 pts |
| High school graduate or higher (age 25+) | 84.8%±0.9 pts | 90.4% | – |
| Bachelor's degree or higher (age 25+) | 32.6%±0.9 pts | 40.2% | +2.9 pts |
| Graduate or professional degree (age 25+) | 14.3%±0.7 pts | 18.6% | – |
| Lived in the same house a year earlier | 92.7%±0.7 pts | 92.8% | – |
| Moved from another state in the past year | 0.5%±0.2 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 (town) earn?
Half of Islip (town)'s 102,205 households earn less than $130,132 a year (±$2,573), against $130,686 in Suffolk County and $85,974 in New York. In 2015-2019 the median was $121,084 in 2024 dollars, so it rose by $9,048 after inflation. 6.4% of residents live below the poverty line.
| Measure | Islip (town) | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $130,132±$2,573 | $130,686 | +$9,048 |
| Mean household income | $154,844±$2,547 | $166,220 | – |
| Per capita income | $48,103±$1,065 | $57,164 | +$1,537 |
| People below the poverty line | 6.4%±0.6 pts | 6.4% | no clear change |
| Children under 18 below the poverty line | 6.5%±1.2 pts | 7.1% | −2.5 pts |
| Households receiving SNAP | 9.4%±0.7 pts | 7.2% | – |
| Households with a computer | 96.1%±0.6 pts | 96.5% | – |
| Households with a broadband subscription | 91.3%±0.8 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 (town)?
Owners occupy 80.5% of Islip (town)'s occupied homes and renters 19.5%. The median owner-occupied home is valued at $535,300 by its owner (±$6,786). The median renter pays $2,209 a month including utilities, and 48.9% of renters pay 35% or more of their income on rent.
| Measure | Islip (town) | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $535,300±$6,786 | $578,400 | +$84,989 |
| Median gross rent | $2,209±$47 | $2,255 | +$80 |
| Renters paying 35% or more of income on rent | 48.9%±2.9 pts | 49.0% | no clear change |
| Median monthly owner costs, with a mortgage | $3,222±$33 | $3,320 | – |
| Owner-occupied homes | 80.5%±1.0 pts | 82.2% | +2.0 pts |
| Renter-occupied homes | 19.5%±1.0 pts | 17.8% | – |
| Housing units | 109,533±1,498 | 580,772 | no clear change |
| Homeowner vacancy rate | 0.5%±0.2 pts | 0.6% | – |
| Rental vacancy rate | 5.5%±1.3 pts | 4.1% | – |
| Single-family detached homes | 75.1%±1.0 pts | 79.7% | – |
| Mobile homes | 1.0%±0.3 pts | 1.3% | – |
| Built 2020 or later | 0.7%±0.2 pts | 0.7% | – |
| Built 2010 to 2019 | 2.6%±0.4 pts | 3.7% | – |
| Built 1939 or earlier | 8.9%±0.6 pts | 9.1% | – |
| Households with no vehicle | 6.3%±0.8 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 many new homes is Islip (town) building?
Builders took permits for 53 new housing units in Islip (town) in 2025 (53 in single-family houses), 0.2 per 1,000 residents against 1.9 across New York.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Islip (town) work and get to work?
74.4% of Islip (town)'s workers drive alone and 8.3% work from home. The average trip to work takes 28.3 minutes. The unemployment rate in 2020-2024 averaged 4.5%.
| Measure | Islip (town) | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 67.8%±0.8 pts | 65.5% | – |
| Unemployment rate | 4.5%±0.5 pts | 4.7% | no clear change |
| Drove alone to work | 74.4%±1.1 pts | 72.1% | – |
| Carpooled | 9.6%±0.8 pts | 7.5% | – |
| Public transportation | 3.5%±0.4 pts | 4.8% | – |
| Walked | 0.8%±0.2 pts | 1.4% | – |
| Worked from home | 8.3%±0.5 pts | 12.0% | +5.8 pts |
| Mean travel time to work | 28.3 min±0.6 | 31.1 min | −2.7 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 (town)?
69 census tracts lie mostly in Islip (town), and 1 more reaches into it (2020 census blocks). Their median household incomes run from $41,711 (Tract 1470.04) to $223,273 (Tract 1469.02).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 1460.05Suffolk County | 8,786 | $114,983 |
| Tract 1464.03Suffolk County | 7,128 | $115,089 |
| Tract 1475.05Suffolk County | 6,997 | $134,682 |
| Tract 1459.03Suffolk County | 6,848 | $172,264 |
| Tract 1457.03Suffolk County | 6,335 | $107,250 |
| Tract 1474.01Suffolk County | 6,146 | $105,667 |
| Tract 1468Suffolk County | 6,087 | $176,382 |
| Tract 1466.18Suffolk County | 5,996 | $121,903 |
| Tract 1462.02Suffolk County | 5,849 | $136,813 |
| Tract 1460.02Suffolk County | 5,804 | $151,250 |
| Tract 1478.04Suffolk County | 5,740 | $157,738 |
| Tract 1475.02Suffolk County | 5,438 | $167,340 |
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 (town)) · Census block assignment files
How does Islip (town) compare with other places in New York?
By the Census Bureau's July 2025 estimates, Islip (town) is the 3rd-most populous of the 16,079 U.S. towns and townships that have one and the 3rd-most populous of 924 in New York.
Islip (town) ranks 271st 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, July 2025 estimate | 3rd | 924 |
| Growth 2020-2025 (PEP) | 310th | 1,225 |
| Residents per square mile | 253rd | 1,657 |
| Median household income | 271st | 1,623 |
| Per capita income | 617th | 1,653 |
| Median home value | 309th | 1,637 |
| Median gross rent | 202nd | 1,515 |
| Poverty rate | 1,012th | 1,331 |
| Bachelor's degree or higher | 808th | 1,640 |
| Median age | 1,261st | 1,654 |
| Owner-occupied share | 764th | 1,639 |
| Work from home | 1,080th | 1,350 |
| Travel time to work | 632nd | 1,652 |
Islip (town)'s figures with every place in New York (CSV)
Every place in New York, sortable · Compare Islip (town) 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 (town)?
2 of the 57 figures for Islip (town) 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 (town) 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.