Population 37,745 · Census ACS 2020–24
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Population and households in Central Islip
Household size in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.89 | 2.79 | 2.68 | 2.68 |
| 2010–14 | 4.02 | 2.85 | 2.72 | 2.73 |
| 2015–19 | 3.67 | 2.82 | 2.69 | 2.71 |
| 2020–24 | 4.58 | 2.79 | 2.65 | 2.65 |
| Change | +0.68 | −0.00 | −0.03 | −0.03 |
Households in Central Islip are large by national standards, averaging 4.58 people against 2.65 for the U.S. That usually means more families with children at home. Since 2006–10, household size has climbed from 3.89, even as the national average fell. Only five of the 488 New York cities with 5,000+ people have larger households.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 33.3 | 38.0 | 38.3 | 37.7 |
| 2010–14 | 33.7 | 38.7 | 39.0 | 38.6 |
| 2015–19 | 36.5 | 39.8 | 40.2 | 39.6 |
| 2020–24 | 35.3 | 40.4 | 40.8 | 40.1 |
| Change | +2.0 | +2.4 | +2.5 | +2.3 |
Central Islip is young: half of its residents are under 35.3, compared with a national median of 40.1. The population tilts toward young families with children. Since 2006–10, the median age has climbed from 33.3, in line with the national trend. Only 34 of the 488 New York cities with 5,000+ people are younger.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 20.6% | 13.1% | 13.1% | 12.3% |
| 2010–14 | 23.9% | 12.8% | 12.7% | 12.3% |
| 2015–19 | 16.6% | 11.4% | 11.6% | 11.6% |
| 2020–24 | 18.5% | 11.6% | 11.6% | 11.6% |
| Change | −2.1 pts | −1.5 pts | −1.5 pts | −0.6 pts |
Single-parent households are common in Central Islip: 18.5% of all households, against 11.6% nationally. The single-parent share is down 2.1 points from 2006–10, a much bigger shift than nationally. Of the 488 New York cities with 5,000+ people, only 15 have a higher share of single-parent households.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Central Islip
Renters in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 26.4% | 47.1% | 44.8% | 33.3% |
| 2010–14 | 33.8% | 48.7% | 46.2% | 35.6% |
| 2015–19 | 28.3% | 48.8% | 46.2% | 36.0% |
| 2020–24 | 20.1% | 48.6% | 45.7% | 34.8% |
| Change | −6.3 pts | +1.5 pts | +0.9 pts | +1.5 pts |
Central Islip is largely a place of homeowners: only 20.1% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. More than a quarter of owners (27.2%) have paid off their mortgages, well below the national share of 39.8%. Since 2006–10, the renter share has fallen 6.3 points, even as the national share rose.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.5% | 9.1% | 10.3% | 11.4% |
| 2010–14 | 7.4% | 9.0% | 10.4% | 11.4% |
| 2015–19 | 9.8% | 9.1% | 11.0% | 11.1% |
| 2020–24 | 9.8% | 7.9% | 9.7% | 9.6% |
| Change | +3.3 pts | −1.2 pts | −0.6 pts | −1.8 pts |
About as many homes sit empty in Central Islip as nationally: 9.8%, against 9.6%. The rate is higher than in the wider New York area (7.9%). Vacancy has risen 3.3 points since 2006–10, even as the national rate fell.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 1969 | 1957 | 1956 | 1974 |
| 2010–14 | 1969 | 1958 | 1957 | 1975 |
| 2015–19 | 1971 | 1959 | 1958 | 1977 |
| 2020–24 | 1969 | 1962 | 1961 | 1980 |
| Change | −0 | +5 | +5 | +6 |
Central Islip is a place of older homes: half were built before 1969, while the national median is 1980. That means established neighborhoods, and more houses that may need updating. Still, homes here are newer than in the New York area overall, where the median home dates to 1962. The newest homes are mostly in the south, the oldest in the northwest.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,403 | $1,268 | $1,095 | $965 |
| 2010–14 | $1,477 | $1,377 | $1,201 | $1,040 |
| 2015–19 | $1,586 | $1,645 | $1,426 | $1,213 |
| 2020–24 | $2,314 | $2,060 | $1,794 | $1,571 |
| Change | +$911 | +$792 | +$698 | +$606 |
Rent in Central Islip runs $2,314 a month at the median, utilities included, well above the U.S. median of $1,571. Rents are up $911 a month from 2006–10, a 65% jump, roughly in step with the nation. Rent takes 42.6% of the typical renter's income, well over the 30% mark often used to define affordable rent, so many renters here are stretched. Rents run highest in the northeast and lowest in the center.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Central Islip
Bachelor's degrees in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 16.8% | 35.0% | 31.9% | 28.4% |
| 2010–14 | 14.3% | 36.7% | 33.4% | 29.6% |
| 2015–19 | 17.0% | 39.9% | 36.2% | 32.1% |
| 2020–24 | 18.6% | 43.6% | 39.8% | 35.6% |
| Change | +1.8 pts | +8.6 pts | +8.0 pts | +7.2 pts |
Fewer adults in Central Islip have a four-year degree than in the country as a whole: 18.6%, against 35.6% nationally. Since 2006–10, the share with a degree has risen 1.8 points, a smaller shift than nationally. Only 17 of the 488 New York cities with 5,000+ people have a lower share of college graduates.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 72.4% | 83.7% | 84.0% | 84.9% |
| 2010–14 | 70.3% | 84.6% | 84.9% | 86.1% |
| 2015–19 | 74.5% | 86.2% | 86.5% | 87.7% |
| 2020–24 | 73.6% | 86.9% | 87.3% | 89.3% |
| Change | +1.2 pts | +3.3 pts | +3.3 pts | +4.3 pts |
Just over a quarter of adults in Central Islip never finished high school, well above the national share: only 73.6% have a diploma or equivalent, against 89.3% nationally. Since 2006–10, the share with a diploma has edged up 1.2 points, a smaller shift than nationally. Only seven of the 488 New York cities with 5,000+ people have a lower share of high school graduates.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Central Islip
| Period | Central Islip | New York area | New York | U.S. |
|---|---|---|---|---|
| 2006–10 | 10.9% | 7.9% | 7.7% | 8.1% |
| 2010–14 | 8.3% | 9.5% | 9.2% | 9.4% |
| 2015–19 | 3.9% | 5.7% | 5.7% | 5.6% |
| 2020–24 | 5.9% | 6.9% | 6.6% | 5.4% |
| Change | −5.0 pts | −0.9 pts | −1.2 pts | −2.7 pts |
Unemployment in Central Islip is close to the national rate: 5.9% of the labor force, against 5.4%. The rate is lower than in the New York area overall (6.9%). Since 2006–10, unemployment has fallen 5.0 points, in line with the national trend.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Central Islip compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Central Islip | 4.58 | 35.3 | 18.5% | 20.1% | 9.8% | 1969 | $2,314 | 18.6% | 73.6% | 5.9% |
| Islandia | 2.79 | 42.1 | 7.2% | 4.0% | 8.3% | 1972 | $2,046 | 32.4% | 87.6% | 5.5% |
| North Great River | 3.28 | 45.6 | 3.8% | 12.6% | 3.5% | 1965 | $2,416 | 28.6% | 86.2% | 3.0% |
| Brentwood | 2.93 | 41.7 | 7.7% | 17.8% | 11.7% | 1970 | $2,255 | 40.2% | 0.0% | 4.7% |
| Islip Terrace | 3.16 | 42.2 | 7.0% | 10.5% | 5.4% | 1960 | $2,635 | 30.0% | 91.2% | 1.2% |
| Hauppauge | 3.11 | 43.9 | 8.4% | 15.9% | 5.6% | 1969 | $2,450 | 50.0% | 93.5% | 6.0% |
| Islip | 2.84 | 45.7 | 6.4% | 17.1% | 6.4% | 1963 | $2,466 | 36.2% | 89.7% | 5.7% |
| North Bay Shore | 4.74 | 34.8 | 19.6% | 16.2% | 7.4% | 1971 | $1,761 | 13.8% | 70.2% | 4.1% |
| East Islip | 2.95 | 44.7 | 8.3% | 15.2% | 4.4% | 1962 | $2,734 | 44.6% | 93.6% | 1.6% |
| Ronkonkoma | 3.13 | 39.3 | 8.6% | 18.2% | 6.9% | 1971 | $2,463 | 31.8% | 93.1% | 6.5% |
| Pine Aire | 2.93 | 41.7 | 7.7% | 17.8% | 11.7% | 1970 | $2,255 | 40.2% | 0.0% | 4.7% |
All figures 2020–24.
Cities with similar populations: Torrington, CT · Gaffney, SC · Randolph, MA · Farmers Branch, TX · Fairhope, AL · Enterprise, AL · Elizabeth City, NC · Roseville, MN · Sanger, CA · Trumbull, CT
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Central Islip. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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