Middle Island, NY Profile: Facts, Map & Data


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Middle Island, New York - Basic Facts

The Middle Island Census Designated Place had a population of 10,506 as of July 1, 2017. Middle Island 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 Middle Island is located at latitude 40.8925 and longitude -72.9512 in Suffolk County. The formal boundaries for the Middle Island Census Designated Place (see map below) encompass a land area of 8.24 sq. miles and a water area of 0.06 sq. miles. Suffolk County is in the Eastern time zone (GMT -5). The elevation is 82 feet.

The Middle Island Census Designated Place (GNIS ID: 2389478) 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 Middle Island Census Designated Place is located within Town of Brookhaven, a minor civil division (MCD) of Suffolk County.

Beneath the boundary map are tables with Middle Island 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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Middle Island Census Designated Place, NY Boundary Map

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


Total Population 10,506
Daytime Population: Workers 3,041
Daytime Population: Residents 5,355
Total Daytime Population (TDP) 8,396
Ratio TDP/Total Population1 0.80
Population in Households 10,192
Population in Familes 8,036
Population in Group Qrtrs 314
Population Density2 1,275
Diversity Index3 49


Median Household Income $68,141
Average Household Income $86,475
Per Capita Income $35,534


Total Housing Units 4,500 (100%)
Owner Occupied HU 3,203 (71.2%)
Renter Occupied HU 999 (22.2%)
Vacant Housing Units 298 ( 6.6%)
Median Home Value $294,881
Average Home Value $325,866


Total Households 4,202
Average Household Size 2.43
Family Households 2,672
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 0.03% 0.14%
Households -0.05% 0.08%
Families -0.2% -0.01%
Median Household Income   2.18%
Per Capita Income   2.29%

Middle Island, NY - Peer Comparisons by Rank and Percentile

The table below compares Middle Island 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 # 186 85th
Population Density # 612 49th
Diversity Index # 248 80th
Median Household Income # 494 59th
Per Capita Income # 478 60th

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

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