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Dauphin Island, Alabama

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Census Data for Dauphin Island ...

Population ...

The most recent Census Estimate<1> was for 2016 and it gives Dauphin Island a population of 1,261 people.

The last Decennial Census<2> was in 2010, giving Dauphin Island a population of 1,238 people.

The town of Dauphin Island is located in Mobile County. The 2010 Census gave Mobile County a population of 412,992 people. This means that Dauphin Island had 0.3% of the county's total population, making it Mobile's 10th most populous community.

At the same time, Alabama had a population of 4,779,736 people, meaning that Dauphin Island had 0.03% of the total population of Alabama - making it the state's 235th most populous community.

Area ...

When the Census Bureau conducts a census for a town like Dauphin Island, they draw a boundary around the area in which they are going to conduct their count - this is called a sampling area (or 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 town.

Things like the population, area and housing for Dauphin Island reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Dauphin Island might be slightly different, it's best to check with the U.S. Census Bureau if you need precision.

The 2010 Census shows that the sample polygon for Dauphin Island has a total area of 166 square miles [429.8 km²]. Of this total, 6.35 square miles [16.4 km²] is land, with the balance (96.2%) being water (159.6 square miles [413.4 km²]).

Mobile County has a land area of 1,229 square miles [3,184.2 km²]. At 6.35 square miles [16.4 km²], Dauphin Island has 0.52% of the county'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 at the center of the polygon). At the time of the 2010 Census, the sampling area was located at:

Lat:   30° 14' 58"   (or 30.25°)             [Map]

Lon:   -88° 11' 31"   (or -88.19°)

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 (1,238 people) and land area (6.35 square miles [16.4 km²]) values from the 2010 Census, Dauphin Island had a population density of 7.46 people per square mile [2.88 people/km²].

In comparison, the 2000 Census shows Dauphin Island had a population of 1,371 people and a land area of 6.2 square miles [16 km²]. This gives a population density of 8.26 people per square mile [3.19 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 Dauphin Island. You need to be careful when making such a comparison, the differences are likely to lead to a questionable comparison. More information about these differences can be found in the section Census-to-Census Observations ... (see below).

Housing Units ...

At the time of the 2010 Census, Dauphin Island had 1,818 Housing Units<3> and with its population of 1,238 people, this averages 0.68 people per Housing Unit.

The 2010 Census shows Dauphin Island had a land area of 6.35 square miles [16.4 km²]. This translates to 10.96 Housing Units per square mile [4.23 housing units/km²].

From the Census of 2000: Dauphin Island had 1,691 Housing Units, a population of 1,371 people and a land area of 6.2 square miles [16 km²]. This gives a density of 0.81 people per Housing Unit and 10.18 Housing Units per square mile [3.93 housing units/km²].

NOTE: Repeating the caution above (under Population Density), be aware that when comparing Housing Units between the 2000 and the 2010 Census, there were changes in the sampling area for Dauphin Island and you need to be careful when comparing results 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).

Mobile County ...

Dauphin Island is located in Mobile County.

The county had a population of 412,992 people at the 2010 Census. With it's population of 1,238 people, Dauphin Island represented 0.3% of the county's total.

In addition, where the town of Dauphin Island has a population density of 7.46 people per square mile [2.88 people/km²], Mobile County averages 335.9 people per square mile [129.7 people/km²].

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

Population Rings for Dauphin Island ...

To help identify the number of people who live in Dauphin Island and the surrounding area, we have drawn concentric rings centered on Dauphin Island. We counted the number of communities within each ring and summed their populations.<4>

  Radius   No of
  Since 2010    
5 mi   [8 km]11,261+1.86%
10 mi   [16 km]11,261+1.86%
20 mi   [32 km]23,774-0.58%
25 mi   [40 km]535,686+20.62%
30 mi   [48 km]12309,707+3.74%

Census-to-Census Observations ...

Introduction ...

When the Census Bureau takes a census count (or enumeration) for Dauphin Island, 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 Dauphin Island. 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.

Area ...

There is only a very minor difference in the sampling area given between the 2010 Census and the 2000 Census.

The 2010 Census shows that the total area for Dauphin Island was 166 square miles [429.8 km²]. Of this total, 6.35 square miles [16.4 km²] is land, with the balance (96.2%) being water (159.6 square miles [413.4 km²]).

The 2000 Census shows a total area of 166.1 square miles [430.1 km²]. Of this total, 6.2 square miles [16 km²] is land, with the balance (96.3%) being water (159.9 square miles [414.1 km²]).

Location ...

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

For the 2010 Census, the location was given as:

Lat:   30.249554°   (or 30°14'58" N)             [Map]

Lon:   -88.192169°   (or -88°11'31" W)

For the 2000 Census, the location given was:

Lat:   30.256429°   (or 30°15'23" N)             [Map]

Lon:   -88.125231°   (or -88°7'30" W)

The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 4 miles to the west<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 (#2406357) to Dauphin Island. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Dauphin Island. The GNIS point has been mapped to the latitude/longitude:

Lat:   30.256475°   (or 30°15'23" N)             [Map]

Lon:   -88.211348°   (or -88°12'40" W)

The GSP location given for the 2010 Census lies 6,545 feet to the east<6> of the point given by the GNIS for Dauphin Island. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Dauphin Island.

Miscellaneous Information for Dauphin Island ...

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

The GNIS Codes ...

The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Dauphin Island:

GNIS ID for Dauphin Island: 2406357

GNIS ID for Mobile County: 161575

GNIS ID for Alabama: 1779775

The FIPS Codes ...

An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):

State Code: 01 (Alabama)

County Code: 097 (Mobile County)

Place Code: 19744 (Dauphin Island)

State & County Code: 01/097 (Alabama / Mobile County)

State & Place Code: 01/19744 (Alabama / Dauphin Island)

Misc. Census Codes ...

Dauphin Island is located in Census Region #3 (the South Region) and Division #6 (the East South-Central Division).

The US Postal Service ZIP Code ...

While some people have used a ZIP code to identify a community, the purpose of the ZIP code was to make mail delivery more efficient by grouping addresses together. Although the ZIP Code doesn't specifically identify a town like Dauphin Island, it does identify addresses that are in (or near) Dauphin Island. It's important to remember that the boundaries of a ZIP Code can be changed, re-assigned or overlapped with other ZIP Codes.

The ZIP code for Dauphin Island: 36528<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 Dauphin Island.

Other Roadside Stops ...

Cities, Towns and Villages of Alabama

About Mobile County

About Alabama

Off-the-Road Links ...

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)

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

The official website for Mobile County: www.mobilecounty.org/

The official website for State of Alabama: www.alabama.gov/

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 2016.

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<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.

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<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).

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<4>The communities in our count are those provided by the 2010 Census, so keep in mind that our population rings will only include the people living in those communities. Smaller communities usually don't participate directly in the Census and therefore they won't be included. While our count is a close approximation, it shouldn't be considered as a complete or accurate count.

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<5>The calculated bearing (or the angle) to the 2010 Census location is 96 degrees.

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<6>The calculated bearing (or the angle) to the GNIS point is 247 degrees.

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<7>When looking for a ZIP Code, whether Dauphin Island or elsewhere, it's always best to check the website of the United States Postal Service (USPS).

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For additional information, please visit our Glossary for Dauphin Island.