West Sayville, NY Profile: Facts & Data

The primary coordinate point for West Sayville is located at latitude 40.7279 and longitude -73.0976 in Suffolk County. The formal boundaries for the West Sayville Census Designated Place encompass a land area of 1.92 sq. miles and a water area of 0.2 sq. miles. Suffolk County is in the Eastern time zone (GMT -5).

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

A Census Designated Place (CDP) is a statistical counterpart to a self-governing (incorporated) place such as a city, town, or village. A CDP is not a legal entity and has no governmental functions.

West Sayville, NY Data & Demographics (As of July 1, 2025)

POPULATION
Total Population	4,779 (100%)
Population in Households	4,677 (97.9%)
Population in Families	3,984 (83.4%)
Population in Group Quarters¹	102 ( 2.1%)
Population Density	2,490
Diversity Index²	31


INCOME
Median Household Income	$161,467
Average Household Income	$181,332
% of Income for Mortgage⁴	23%
Per Capita Income	$66,654
Wealth Index⁵	205
Socioeconomic Status Index⁶	Moderate (64.6)

HOUSING
Total HU (Housing Units)	2,099 (100%)
Owner Occupied HU	1,463 (69.7%)
Renter Occupied HU	291 (13.9%)
Vacant Housing Units	345 (16.4%)
Median Home Value	$593,096
Average Home Value	$585,875
Housing Affordability Index³	92

HOUSEHOLDS
Total Households	1,754
Average Household Size	2.67
Family Households	1,256
Average Family Size	3.00

NOTES

Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
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 races 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.
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

West Sayville, NY - Peer Comparisons by Rank and Percentile

The table below compares West Sayville to the other 1,293 incorporated cities, towns and CDPs in New York by rank and percentile using July 1, 2025 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.

GROWTH RATE / YEAR	2020-2025	2025-2030
Population	-0.37%	-0.27%
Households	-0.12%	-0.09%
Families		-0.27%
Median Household Income		1.50%
Per Capita Income		1.71%
Owner Occupied HU		0.10%

Variable Description	Rank	Percentile
Total Population	# 375	71st
Population Density	# 348	73rd
Median Household Income	# 137	89th
Housing Affordability Index	# 693	54th
Per Capita Income	# 220	83rd
Diversity Index	# 686	47th

West Sayville, NY Profile: Facts & Data

West Sayville, New York - Basic Facts

West Sayville, NY Data & Demographics (As of July 1, 2025)

POPULATION

INCOME

HOUSING

HOUSEHOLDS

GROWTH RATE / YEAR

West Sayville, NY - Peer Comparisons by Rank and Percentile

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