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A Gazetteer for the United States and Canada

Demopolis, Alabama

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The location of Demopolis

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Census Data for Demopolis ...

Population ...

The most recent Census Estimate<1> was for 2015 and it gives Demopolis a population of 7,148 people.

The last Decennial Census<2> was in 2010, giving Demopolis a population of 7,483 people.

The city of Demopolis is located in Marengo County. The 2010 Census gave Marengo County a population of 21,027 people. This means that Demopolis had 35.59% of the county's total population, making it Marengo's most populous community.

At the same time, Alabama had a population of 4,779,736 people, meaning that Demopolis had 0.16% of the total population of Alabama - making it the state's 79th most populous community.

Area ...

When the Census Bureau conducts a census for a city like Demopolis, 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 city.

Things like the population, area and housing for Demopolis reflect the sampling area. Since the shape of the sampling area and the actual boundaries of&$160;Demopolis 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 Demopolis has a total area of 18.06 square miles [46.8 km²]. Of this total, 17.74 square miles [45.9 km²] is land, with the balance (1.79%) being water (0.32 square miles [0.8 km²]).

Marengo County has a land area of 976 square miles [2,530.1 km²]. At 17.74 square miles [45.9 km²], Demopolis has 1.82% 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:   32° 30' 34"   (or 32.51°)

Lon:   -87° 50' 14"   (or -87.84°)

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 (7,483 people) and land area (17.74 square miles [45.9 km²]) values from the 2010 Census, Demopolis had a population density of 414.3 people per square mile [160 people/km²].

In comparison, the 2000 Census shows Demopolis had a population of 7,540 people and a land area of 12.23 square miles [31.7 km²]. This gives a population density of 604 people per square mile [233.3 people/km²]

NOTE: Be aware that when comparing population density between the 2000 Census and the 2010 Census, there were changes in the sampling area for Demopolis. You need to be careful when making such a comparison, the differences are likely to lead to an incorrect comparison. More information about the changes can be found in the section Census-to-Census Observations ... (see below).

Housing Units ...

At the time of the 2010 Census, Demopolis had 3,417 Housing Units<3> and with its population of 7,483 people, this averages 2.19 people per Housing Unit.

The 2010 Census shows Demopolis had a land area of 17.74 square miles [45.9 km²]. This translates to 189.2 Housing Units per square mile [73 housing units/km²].

From the Census of 2000: Demopolis had 3,311 Housing Units, a population of 7,540 people and a land area of 12.23 square miles [31.7 km²]. This gives a density of 2.28 people per Housing Unit and 265.3 Housing Units per square mile [102.4 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 Demopolis 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).

Marengo County ...

Demopolis is located in Marengo County.

The county had a population of 21,027 people at the 2010 Census. With it's population of 7,483 people, Demopolis represented 35.59% of the county's total.

In addition, where the city of Demopolis has a population density of 414.3 people per square mile [160 people/km²], Marengo County averages 21.52 people per square mile [8.31 people/km²].

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

Population Rings for Demopolis ...

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

RadiusNo of
Since 2010
5 mi [8 km]17,148-4.48%
10 mi [16 km]27,749-4.71%
15 mi [24 km]610,132-4.67%
20 mi [32 km]1115,635---
25 mi [40 km]1622,517-1.21%
30 mi [48 km]2025,696-1.75%

US Census QuickFacts ...

The Census Bureau has created documents containing demographic information called QuickFacts. Although they don't create QuickFacts for all communities, they do have one for Demopolis. Not only does the QuickFact have details about Demopolis, it also contains a comparison between Demopolis and the state of Alabama.

Click here for the Demopolis QuickFact (QF-0120296).

A Census QuickFact is available for Marengo County (QF-01091).

Below are QuickFacts for the counties that border Marengo County.

2015 Est.
Since 2010
ChoctawQF-0102313,170-4.97%   SW  
ClarkeQF-0102524,675-4.48%   S  
DallasQF-0104741,131-6.14%   E  
GreeneQF-010638,479-6.26%   N  
HaleQF-0106515,068-4.39%   N  
PerryQF-011059,652-8.87%   NE  
SumterQF-0111913,103-4.8%   NW  
WilcoxQF-0113111,059-5.24%   SE  

Census-to-Census Observations ...

Introduction ...

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

The sampling area (or polygon) given for the 2010 Census is 44.73% larger than the 2000 Census.

The 2010 Census shows that the total area for Demopolis was 18.06 square miles [46.8 km²]. Of this total, 17.74 square miles [45.9 km²] is land, with the balance (1.79%) being water (0.32 square miles [0.8 km²]).

The 2000 Census shows a total area of 12.48 square miles [32.3 km²]. Of this total, 12.23 square miles [31.7 km²] is land, with the balance (1.36%) being water (0.25 square miles [0.6 km²]).

Location ...

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

For the 2010 Census, the location was given as:

Lat:   32.499435°   (or 32°29'57" N)

Lon:   -87.825006°   (or -87°49'30" W)

For the 2000 Census, the location given was:

Lat:   32.509465°   (or 32°30'34" N)

Lon:   -87.837265°   (or -87°50'14" W)

The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 5,251 feet to the southeast<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 (#2404214) to Demopolis. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Demopolis. The GNIS point has been mapped to the latitude/longitude:

Lat:   32.497937°   (or 32°29'52" N)

Lon:   -87.829861°   (or -87°49'47" W)

The GSP location given for the 2010 Census lies 1,589 feet to the east<6> of the point given by the GNIS for Demopolis. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Demopolis.

Miscellaneous Information for Demopolis ...

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 Marengo County or the city of Demopolis:

The GNIS Codes ...

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

GNIS ID for Demopolis: 2404214

GNIS ID for Marengo County: 161572

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: 091 (Marengo County)

Place Code: 20296 (Demopolis)

State & County Code: 01/091 (Alabama / Marengo County)

State & Place Code: 01/20296 (Alabama / Demopolis)

Misc. Census Codes ...

Demopolis 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 city like Demopolis, it does identify addresses that are in (or near) Demopolis. 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 Demopolis: 36732<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 Demopolis.

Other Roadside Stops ...

Communities in Alabama

About Marengo 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)

The official website for Demopolis:

The official website for State of Alabama:

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 2015.

- Return to Citation

<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.

- Return to Citation

<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).

- Return to Citation

<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.

- Return to Citation

<5>The calculated bearing (or the angle) to the 2010 Census location is 225 degrees.

- Return to Citation

<6>The calculated bearing (or the angle) to the GNIS point is 290 degrees.

- Return to Citation

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

- Return to Citation

For additional information, please visit our Glossary for Demopolis.


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This page was last modified: 17 Apr 2017
By John Hall