Town Of Islip NY Demographic Data and Boundary Map


Town Of Islip, NY

The Town Of Islip is a County Subdivision of Suffolk County. The subdivision has a T1 Census Class Code which indicates that the Town Of Islip is an active county subdivision that is not coextensive with an incorporated place.

Also See: Suffolk County Data | Cities in Suffolk County | County Subdivisions in Suffolk County

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  1. Town Of Islip 2018 Demographic Data
  2. Growth Rates for Town Of Islip (Historical & 5-Year Forecast)
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Town Of Islip Boundary Map


Town Of Islip Data & Demographics (As of July 1, 2018)


Total Population 338,824
Population in Households 334,691
Population in Familes 284,288
Population in Group Qrtrs 4,133
Population Density1 3,254
Diversity Index2 72


Total Households 103,698
Average Household Size 3.23
Family Households 78,387
Average Family Size 4


Total Housing Units 112,253 (100%)
Owner Occupied HU 78,758 (70.2%)
Renter Occupied HU 24,940 (22.2%)
Vacant Housing Units 8,555 ( 7.6%)
Median Home Value $384,903
Average Home Value $448,826


Median Household Income $94,788
Average Household Income $117,290
Per Capita Income $36,231
  (Compound Annual Growth Rates)


2010-2014 2014-2019
Population 0.12% 0.12%
Households 0.01% 0.06%
Families -0.11% -0.01%
Median Household Income   1.89%
Per Capita Income   2.72%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

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New York Census Data Comparison Tool

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