Central Islip, NY Profile: Facts, Map & Data


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Central Islip, New York - Basic Facts

The Central Islip Census Designated Place had a population of 34,919 as of July 1, 2017. Central 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 Central Islip is located at latitude 40.7838 and longitude -73.1945 in Suffolk County. The formal boundaries for the Central Islip Census Designated Place (see map below) encompass a land area of 7.11 sq. miles and a water area of 0 sq. miles. Suffolk County is in the Eastern time zone (GMT -5). The elevation is 89 feet.

The Central Islip Census Designated Place (GNIS ID: 2389298) 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 Central 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 Central 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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Central Islip Census Designated Place, NY Boundary Map

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


Total Population 34,919
Daytime Population: Workers 9,331
Daytime Population: Residents 17,777
Total Daytime Population (TDP) 27,108
Ratio TDP/Total Population1 0.78
Population in Households 34,717
Population in Familes 27,641
Population in Group Qrtrs 202
Population Density2 4,912
Diversity Index3 88


Median Household Income $72,065
Average Household Income $88,279
Per Capita Income $24,018


Total Housing Units 10,214 (100%)
Owner Occupied HU 6,349 (62.2%)
Renter Occupied HU 3,088 (30.2%)
Vacant Housing Units 777 ( 7.6%)
Median Home Value $296,553
Average Home Value $309,366


Total Households 9,437
Average Household Size 3.68
Family Households 6,878
Average Family Size 4
  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 0.19% 0.2%
Households 0.11% 0.2%
Families -0.1% 0.07%
Median Household Income   1.87%
Per Capita Income   2.68%

Central Islip, NY - Peer Comparisons by Rank and Percentile

The table below compares Central 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 # 30 98th
Population Density # 140 88th
Diversity Index # 4 100th
Median Household Income # 461 62nd
Per Capita Income # 965 19th

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

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