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Census Data for Southold ...

Population ...

The most recent Census Estimate<1> was for 2019 and it gave Southold a population of 22,186 people.

The last Decennial Census<2> was in 2010, which gave Southold a population of 21,968 people.

The community of Southold is located in Suffolk County. The 2010 Census gave Suffolk County; a population of 1,493,350 people. This means that Southold had 1.47% of the county's total population, making it Suffolk's 9th most populous community.

At the same time, New York had a population of 19,378,102 people, meaning that Southold had 0.11% of the total population of New York - making it the state's 110th most populous community.

Area ...

The 2010 Census shows that the sampling area for Southold has a total area of 403.7 square miles [1,045.6 km²]. Of this total, 53.8 square miles [139.3 km²] is land, with the balance (86.7%) being water (349.9 square miles [906.3 km²]).

Suffolk County has a land area of 912 square miles [2,362.2 km²]. At 53.8 square miles [139.3 km²], Southold has 5.9% of the county's total land area.

  • Continue Reading ...
    • When the Census Bureau conducts a census for a community like Southold, they draw a boundary around the area in which they are going to conduct their count - this defines the sampling area (usually a polygon). The shape of the sampling area can be quite complex and it's important to keep in mind that the boundaries of the sampling area may or may not match the recognized boundaries of the community.
    • Things like population, area and housing for Southold reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Southold might be different, it's best to check with the U.S. Census Bureau to resolve any difference between the two.
    • Not only does the sampling area define boundaries, it also has a GPS location (latitude & longitude) that indicates a point within the sampling area (usually the center of the polygon, known as the centroid). At the time of the 2010 Census, the sampling area was located at:
    • Lat:   41° 8' 20"   (or 41.14°)
    • Lon:   -72° 19' 7"   (or -72.32°)
    • More information on this topic and the changes between the 2000 Census and the 2010 Census can be found in the section for our Census-to-Census Observations ... (see below).

Housing Units ...

At the time of the 2010 Census, Southold had 15,377 Housing Units<3> and with its population of 21,968 people, this averages 1.43 people per Housing Unit.

  • Continue Reading ...
    • The 2010 Census shows Southold had a land area of 53.8 square miles [139.3 km²]. This translates to 38.09 Housing Units per square mile [14.71 housing units/km²].
    • From the Census of 2000: Southold had 13,769 Housing Units, a population of 20,599 people and a land area of 53.7 square miles [139.1 km²]. This gives a density of 1.5 people per Housing Unit and 34.04 Housing Units per square mile [13.14 housing units/km²].
    • Note: Repeating the caution above (under Population Density), be aware that when comparing Housing Units between the 2010 Census and the 2000 Census, there were changes in the sampling area for Southold and you need to be careful when comparing numbers between the censuses. More information about the nature of these the changes can be found in the section called Census-to-Census Observations ... (see below).

Suffolk County ...

The community of Southold is located in Suffolk County<4>.

The county had a population of 1,493,350 people at the 2010 Census. With it's population of 21,968 people, Southold represented 1.47% of the county's total.

In addition, where the community of Southold has a population density of 54.4 people per square mile [21.01 people/km²], Suffolk County averages 1,637 people per square mile [632 people/km²].

For more information, please visit our Census Page for Suffolk County.

Census-to-Census Observations ...

Introduction ...

When the Census Bureau takes a census count (or enumeration) for Southold, they start by specifying the boundaries of the area to be counted. This area (or sampling area) is a polygon and its shape can be quite complex - it may or may not match the geographical boundaries of Southold. It's important to note that from one Census to the next, the shape and location of the polygon can change.

  • Continue Reading ...
    • Although we don't have specific information about the shape of the polygon for Southold or how it changed has over time, there is some information that can give us some hints. For example, since the shape of the sampling area is directly related to the shape of the polygon, any change to area probably indicates a new shape for the polygon.
    • If you need precision or details about the methodology of the Census, you should visit the U.S. Census Bureau for a definitive answer.

Location ...

While generally coinciding with the GPS location (latitude/longitude) of Southold, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Southold.

  • Continue Reading ...
    • For the 2010 Census, the location was given as:
    • Lat:   41.138956°   (or 41°8'20" N)
    • Lon:   -72.318687°   (or -72°19'7" W)
    • For the 2000 Census, the location given was:
    • Lat:   41.066458°   (or 41°3'59" N)
    • Lon:   -72.409353°   (or -72°24'33" W)
    • The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 6 miles to the northeast<5> of the location that was used in the 2000 Census.
    • The U.S. Geological Survey (USGS) and the U.S. Board on Geographic Names (BGN) have assigned a unique GNIS identifier (#979508) to Southold. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Southold. The GNIS point has been mapped to the latitude/longitude:
    • Lat:   41.133709°   (or 41°8'1" N)
    • Lon:   -72.260358°   (or -72°15'37" W)
    • The GPS location given for the 2010 Census lies 3 miles to the west<6> of the point given by the GNIS for Southold. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Southold.

Miscellaneous Information for Southold ...

The Federal government has assigned various identifying codes to each community, county and state. At one time or another, the US Census Bureau has used one (or more) of the following identifiers when referring to either Suffolk County or the community of Southold:

  • The GNIS Codes ...
    • The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Southold:
    • GNIS ID for Southold: 979508
    • GNIS ID for Suffolk County: 974149
    • GNIS ID for State of New York: 1779796
  • The FIPS Codes ...
  • Misc. Census Codes ...
    • Southold is located in Census Region #1 (the Northeast Region) and Division #2 (the Middle Atlantic Division).

For more information about the various Federal identification codes, please visit our Misc Page for Southold.

Unfortunately, we don't know of a website for Southold. If you can help, please contact us through our Feedback Page.

The official website for Suffolk County:

The official website for State of New York:

The official website of the U.S. Census Bureau

The official website of the U.S. Board on Geographic Names (BGN)

The official website of the U.S. Geological Survey (USGS)

Footnotes ...

<1>Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2019.
<2>Every 10 years (eg- 1990, 2000, 2010), the US Census Bureau conducts a Constitutionally-mandated count (or enumeration) of people living within the United States. This count is called a Decennial Census. The last Decennial Census was the 2010 Census, with the next one planned for 2020.
<3>A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).
<4>If you're interested in how the shape of New York's counties, including Suffolk, have changed over time, we recommend the Atlas of Historical County Boundaries.
<5>The calculated bearing (or angle) to the 2010 Census location is 316 degrees and a distance of 6 miles.
<6>The calculated bearing (or angle) to the GNIS point is 83 degrees and a distance of 3 miles.




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This page was last modified/updated: 25 Jan 2023