Islandia, NY Profile: Facts & Data


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Islandia, New York - Basic Facts

The Village of Islandia had a population of 3,334 as of July 1, 2021. Islandia ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in New York. See peer rankings below.

The primary coordinate point for Islandia is located at latitude 40.8043 and longitude -73.169 in Suffolk County. The formal boundaries for the Village of Islandia encompass a land area of 2.22 sq. miles and a water area of 0 sq. miles. Suffolk County is in the Eastern time zone (GMT -5). The elevation is 49 feet.

The Village of Islandia has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The Village of Islandia is located within Town of Islip, a minor civil division (MCD) of Suffolk County.

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  1. Islandia 2021 Demographic Data
  2. Growth Rates for Islandia (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. New York Research Tools (Easy Tools & Current Data)
  3. New York Data Comparison Tool - 2021 Demographics

Islandia, NY Data & Demographics (As of July 1, 2021)


Total Population 3,334 (100%)
Population in Households 3,130 (93.9%)
Population in Families 2,568 (77.0%)
Population in Group Quarters1 204 ( 6.1%)
Population Density 1,506
Diversity Index2 82


Median Household Income $98,593
Average Household Income $118,536
% of Income for Mortgage4 16%
Per Capita Income $36,493
Wealth Index5 151


Total HU (Housing Units) 1,102 (100%)
Owner Occupied HU 926 (84.0%)
Renter Occupied HU 96 ( 8.7%)
Vacant Housing Units 80 ( 7.3%)
Median Home Value $381,711
Average Home Value $473,703
Housing Affordability Index3 122


Total Households 1,022
Average Household Size 3.06
Family Households 715
Average Family Size 4
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2021 2021-2026
Population -0.07% -0.27%
Households -0.12% -0.32%
Families -0.28% -0.42%
Median Household Income   0.61%
Per Capita Income   1.77%
Owner Occupied HU   -0.22%

Islandia, NY - Peer Comparisons by Rank and Percentile

The table below compares Islandia to the other 1,195 incorporated cities, towns and CDPs in New York by rank and percentile using July 1, 2021 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 459 62nd
Population Density # 537 55th
Median Household Income # 330 72nd
Housing Affordability Index # 448 37th
Per Capita Income # 534 55th
Diversity Index # 33 97th

Additional comparisons and rankings can be made with a VERY EASY TO USE New York Census Data Comparison Tool.

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