Selden, NY Profile: Facts, Map & Data

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Selden, New York - Basic Facts

The Selden Census Designated Place is a community or populated place (Class Code U5) located in Suffolk County at latitude 40.8665 and longitude -73.0357. Suffolk County is in the Eastern time zone (GMT -5). The elevation is 89 feet.

The formal official name is the Selden Census Designated Place, but most people and references simply refer to it as Selden, New York.

The U5 Census Class Code for Selden indicates a populated place that is also a census designated place with the same name. The Census Designated Place has a Functional Status Code "S" which identifies a statistical entity.

The formal boundaries for the Selden Census Designated Place (see map below) encompass a land area of 4.32 sq. miles and a water area of 0 sq. miles.

Alternate Unofficial Names for Selden: Westfield.

Selden Census Designated Place, NY Boundary Map

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Boundary Maps: Town of Brookhaven | Suffolk County | New York Counties

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Selden, NY Data & Demographics (As of July 1, 2014)


Total Population 19,539
Population in Households 19,511
Population in Familes 16,788
Population in Group Qrtrs 28
Population Density1 4,522
Diversity Index2 48


Total Households 6,394
Average Household Size 3.05
Family Households 4,881
Average Family Size 3


Total Housing Units 6,761 (100%)
Owner Occupied HU 4,938 (73.0%)
Renter Occupied HU 1,456 (21.5%)
Vacant Housing Units 367 ( 5.4%)
Median Home Value $261,561
Average Home Value $274,139


Median Household Income $79,436
Average Household Income $91,345
Per Capita Income $29,909
  (Compound Annual Growth Rates)


2010-2014 2014-2019
Population -0.37% -0.15%
Households -0.19% -0.09%
Families -0.32% -0.17%
Median Household Income   1.66%
Per Capita Income   2.11%
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.

Selden, NY - Peer Comparisons by Rank and Percentile

The table below compares Selden to the other 1,189 incorporated cities, towns and CDPs in New York by rank and percentile using July 1, 2014 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 # 85 93rd
Population Density1 # 155 87th
Diversity Index2 # 224 81st
Median Household Income # 368 69th
Per Capita Income # 551 54th

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