Holtsville, NY Profile: Facts, Map & Data


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Holtsville, New York - Basic Facts

The Holtsville Census Designated Place had a population of 20,072 as of July 1, 2017. Holtsville ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in New York. See peer rankings below.

The primary coordinate point for Holtsville is located at latitude 40.8124 and longitude -73.0447 in Suffolk County. The formal boundaries for the Holtsville 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 105 feet.

The Holtsville Census Designated Place (GNIS ID: 2389946) 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 Holtsville Census Designated Place is located within Town of Islip, a minor civil division (MCD) of Suffolk County.

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

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

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


Total Population 20,072
Daytime Population: Workers 5,489
Daytime Population: Residents 9,326
Total Daytime Population (TDP) 14,815
Ratio TDP/Total Population1 0.74
Population in Households 20,026
Population in Familes 17,539
Population in Group Qrtrs 46
Population Density2 2,824
Diversity Index3 41


Median Household Income $98,314
Average Household Income $118,395
Per Capita Income $40,153


Total Housing Units 7,049 (100%)
Owner Occupied HU 5,511 (78.2%)
Renter Occupied HU 1,284 (18.2%)
Vacant Housing Units 254 ( 3.6%)
Median Home Value $364,379
Average Home Value $400,885


Total Households 6,795
Average Household Size 2.95
Family Households 5,170
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 0.25% 0.31%
Households 0.14% 0.24%
Families 0.06% 0.2%
Median Household Income   1.5%
Per Capita Income   2.51%

Holtsville, NY - Peer Comparisons by Rank and Percentile

The table below compares Holtsville 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 # 83 93rd
Population Density # 300 75th
Diversity Index # 322 73rd
Median Household Income # 253 79th
Per Capita Income # 357 70th

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

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