Islip, NY Profile: Facts, Map & Data


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Islip, New York - Basic Facts

The Islip Census Designated Place had a population of 18,793 as of July 1, 2017. Islip ranks in the upper quartile for Population Density and 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 Islip is located at latitude 40.7355 and longitude -73.2164 in Suffolk County. The formal boundaries for the Islip Census Designated Place (see map below) encompass a land area of 4.82 sq. miles and a water area of 0.12 sq. miles. Suffolk County is in the Eastern time zone (GMT -5). The elevation is 13 feet.

The Islip Census Designated Place (GNIS ID: 2389974) has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

The Islip Census Designated Place is located within Town of Islip, a minor civil division (MCD) of Suffolk County.

Beneath the boundary map are tables with Islip population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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Islip Census Designated Place, NY Boundary Map

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Islip, NY Data & Demographics (As of July 1, 2017)


Total Population 18,793
Daytime Population: Workers 4,483
Daytime Population: Residents 8,339
Total Daytime Population (TDP) 12,822
Ratio TDP/Total Population1 0.68
Population in Households 18,736
Population in Familes 16,128
Population in Group Qrtrs 57
Population Density2 3,897
Diversity Index3 51


Median Household Income $93,527
Average Household Income $111,212
Per Capita Income $38,117


Total Housing Units 6,717 (100%)
Owner Occupied HU 5,131 (76.4%)
Renter Occupied HU 1,294 (19.3%)
Vacant Housing Units 292 ( 4.3%)
Median Home Value $377,229
Average Home Value $431,846


Total Households 6,425
Average Household Size 2.92
Family Households 4,755
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. 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 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.


2010-2017 2017-2022
Population 0.08% 0.19%
Households -0.03% 0.12%
Families -0.12% 0.06%
Median Household Income   1.63%
Per Capita Income   2.27%

Islip, NY - Peer Comparisons by Rank and Percentile

The table below compares Islip to the other 1,196 incorporated cities, towns and CDPs in New York by rank and percentile using July 1, 2017 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 # 98 92nd
Population Density # 195 84th
Diversity Index # 230 81st
Median Household Income # 286 76th
Per Capita Income # 410 66th

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

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