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Southold, NY Profile: Facts & Data

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Southold, New York - Basic Facts

The Southold CDP(1) had a population of 6,144 as of July 1, 2025.

The primary coordinate point for Southold is located at latitude 41.0648 and longitude -72.4262 in Suffolk County. The formal boundaries for the Southold Census Designated Place encompass a land area of 10.47 sq. miles and a water area of 0.86 sq. miles. Suffolk County is in the Eastern time zone (GMT -5).

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


  1. 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.

Jump to... (On This Page!)
  1. Southold 2025 Demographic Data
  2. Growth Rates for Southold (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. New York Research Tools (Easy Tools & Current Data)
  3. New York Data Comparison Tool - 2025 Demographics
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Southold, NY Data & Demographics (As of July 1, 2025)

POPULATION

Total Population 6,144 (100%)
Population in Households 6,094 (99.2%)
Population in Families 4,711 (76.7%)
Population in Group Quarters1 50 ( 0.8%)
Population Density 587
Diversity Index2 49
 
 

INCOME

Median Household Income $132,489
Average Household Income $193,571
% of Income for Mortgage4 38%
Per Capita Income $85,657
Wealth Index5 235
Socioeconomic Status Index6 Moderate (56.0)
 

HOUSING

Total HU (Housing Units) 4,423 (100%)
Owner Occupied HU 2,282 (51.6%)
Renter Occupied HU 436 ( 9.9%)
Vacant Housing Units 1,705 (38.5%)
Median Home Value $803,478
Average Home Value $902,698
Housing Affordability Index3 56
 

HOUSEHOLDS

Total Households 2,718
Average Household Size 2.24
Family Households 1,735
Average Family Size 3.00
NOTES
  1. 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.
  2. 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.
  3. 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.
  4. 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).
  5. 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.
  6. 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.

GROWTH RATE / YEAR

 2020-2025 2025-2030
Population 0.33% 0.10%
Households 0.72% 0.37%
Families   0.13%
Median Household Income   2.94%
Per Capita Income   2.14%
Owner Occupied HU   0.60%

Southold, NY - Peer Comparisons by Rank and Percentile

The table below compares Southold 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.

Variable Description Rank Percentile
Total Population # 307 76th
Population Density # 896 31st
Median Household Income # 261 80th
Housing Affordability Index # 208 16th
Per Capita Income # 99 92nd
Diversity Index # 411 68th

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

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