A Gazetteer for the United States and Canada
Census Data for Slidell ...
The most recent Census Estimate<1> was for 2018 and it gave Slidell a population of 27,711 people.
The last Decennial Census<2> was in 2010, which gave Slidell a population of 27,068 people.
The city of Slidell is located in Saint Tammany Parish. The 2010 Census gave Saint Tammany Parish a population of 233,740 people. This means that Slidell had 11.58% of the parish's total population, making it Saint Tammany's most populous community.
When the Census Bureau conducts a census for a city like Slidell, they draw a boundary around the area in which they are going to conduct their count - this defines the sampling area (usually shaped as 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 city.
Things like the population, area and housing for Slidell reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Slidell might be different, it's best to check with the U.S. Census Bureau to resolve any difference between the two.
The 2010 Census shows that the sampling area for Slidell has a total area of 15.21 square miles [39.4 km²]. Of this total, 14.84 square miles [38.4 km²] is land, with the balance (2.39%) being water (0.36 square miles [0.9 km²]).
Saint Tammany Parish has a land area of 845 square miles [2,190 km²]. At 14.84 square miles [38.4 km²], Slidell has 1.76% of the parish's total land area.
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: 30° 17' 21" (or 30.29°) [Map]
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).
Population Density ...
Using the population (27,068 people) and land area (14.84 square miles [38.4 km²]) values from the 2010 Census, Slidell had a population density of 1,779 people per square mile [687 people/km²].
In comparison, the 2000 Census shows Slidell had a population of 25,695 people and a land area of 11.79 square miles [30.5 km²]. This gives a population density of 2,120 people per square mile [818 people/km²]
NOTE: Be aware that when comparing population density between the 2000 and the 2010 Census, there were changes in the sampling area for Slidell. You need to be careful when making such a comparison, the differences are likely to lead to a questionable comparison. More information about the nature of these changes can be found in the section Census-to-Census Observations ... (see below).
Housing Units ...
At the time of the 2010 Census, Slidell had 11,155 Housing Units<3> and with its population of 27,068 people, this averages 2.43 people per Housing Unit.
The 2010 Census shows Slidell had a land area of 14.84 square miles [38.4 km²]. This translates to 733 Housing Units per square mile [283.2 housing units/km²].
From the Census of 2000: Slidell had 10,133 Housing Units, a population of 25,695 people and a land area of 11.79 square miles [30.5 km²]. This gives a density of 2.54 people per Housing Unit and 836 Housing Units per square mile [322.8 housing units/km²].
NOTE: Repeating the caution above (under Population Density), be aware that when comparing Housing Units between the 2000 Census and the 2010 Census, there were changes in the sampling area for Slidell and you need to be careful when comparing 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).
Saint Tammany Parish ...
The community of Slidell is located in Saint Tammany Parish.
The county had a population of 233,740 people at the 2010 Census. With it's population of 27,068 people, Slidell represented 11.58% of the parish's total.
In addition, where the city of Slidell has a population density of 1,779 people per square mile [687 people/km²], Saint Tammany Parish averages 276.4 people per square mile [106.7 people/km²].
For more information, please visit our Census Page for Saint Tammany Parish.
Population Rings for Slidell ...
To help identify the number of people who live in Slidell and the surrounding area, we have drawn concentric rings centered on Slidell. We counted the number of communities within each ring and summed their populations.<4>
Census-to-Census Observations ...
When the Census Bureau takes a census count (or enumeration) for Slidell, 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 Slidell. It's important to note that from one Census to the next, the shape and location of the polygon can change. If you need precision or details about the methodology of the Census, you should visit the U.S. Census Bureau for a definitive answer.
The sampling area (or polygon) given for the 2010 Census is 25.49% larger than the 2000 Census.
The 2010 Census shows that the total area for Slidell was 15.21 square miles [39.4 km²]. Of this total, 14.84 square miles [38.4 km²] is land, with the balance (2.39%) being water (0.36 square miles [0.9 km²]).
The 2000 Census shows a total area of 12.12 square miles [31.4 km²]. Of this total, 11.79 square miles [30.5 km²] is land, with the balance (2.13%) being water (0.32 square miles [0.8 km²]).
While generally coinciding with the GPS location (latitude/longitude) of Slidell, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Slidell.
For the 2010 Census, the location was given as:
Lat: 30.289335° (or 30°17'21" N) [Map]
For the 2000 Census, the location given was:
Lat: 30.279040° (or 30°16'44" N) [Map]
The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 4,138 feet to the northwest<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 (#2405470) to Slidell. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Slidell. The GNIS point has been mapped to the latitude/longitude:
Lat: 30.288097° (or 30°17'17" N) [Map]
The GSP location given for the 2010 Census lies 470 feet to the north<6> of the point given by the GNIS for Slidell. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Slidell.
Miscellaneous Information for Slidell ...
The Federal government has assigned various identifying codes to each community, county, parish and state. At one time or another, the US Census Bureau has used one (or more) of the following identifiers when referring to either Saint Tammany Parish or the city of Slidell:
The GNIS Codes ...
The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Slidell:
GNIS ID for Slidell: 2405470
The FIPS Codes ...
An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):
State Code: 22 (Louisiana)
County Code: 103 (Saint Tammany Parish)
Place Code: 70805 (Slidell)
Misc. Census Codes ...
Slidell is located in Census Region #3 (the South Region) and Division #7 (the West South-Central Division).
US Postal Service ZIP Codes ...
While some people have used ZIP codes to identify a community, the ZIP codes were actually created to make mail delivery more efficient by grouping addresses together. Although a ZIP Code doesn't specifically identify a city like Slidell, they do identify addresses that are in (or near) the city. It's important to remember that the boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes.
Our list of ZIP codes for Slidell : 70458, 70459, 70460 & 70461.<7>
Census ZCTA Codes ...
The US Census Bureau created statistical entities that they call ZIP Code Tabulation Areas (ZCTAs) and these ZCTAs are frequently confused with the ZIP codes that come from the US Postal Service (USPS).
ZCTAs were first created for the 2000 Census and at that time, they were based upon the USPS ZIP codes. While largely covering the same areas, the boundaries of a ZCTA do not necessarily match the boundaries of a postal ZIP code with the same number. For example, while a postal ZIP code can cross a county or state line, a Census ZCTA can not. They should be treated as separate entities with no correlation between them.
For more information about the various Federal identification codes, please visit our Misc Page for Slidell.
Other Roadside Stops ...
Off-the-Road Links ...
The official website of the U.S. Census Bureau
The official website for Slidell: www.slidell.la.us/
The official website for Saint Tammany Parish: www.stpgov.org/
The official website for State of Louisiana: louisiana.gov/
The official website of the U.S. Board on Geographic Names (BGN)
The official website of the U.S. Geological Survey (USGS)
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This page was last modified: 19 Aug 2019