Mountain Brook, Alabama
Census Data for Mountain Brook ...
The most recent Census Estimate<1> was for 2016 and it gives Mountain Brook a population of 20,590 people.
The last Decennial Census<2> was in 2010, giving Mountain Brook a population of 20,413 people.
The city of Mountain Brook is located in Jefferson County. The 2010 Census gave Jefferson County a population of 658,466 people. This means that Mountain Brook had 3.1% of the county's total population, making it Jefferson's 6th most populous community.
At the same time, Alabama had a population of 4,779,736 people, meaning that Mountain Brook had 0.43% of the total population of Alabama - making it the state's 30th most populous community.
When the Census Bureau conducts a census for a city like Mountain Brook, 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 Mountain Brook reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Mountain Brook 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 Mountain Brook has a total area of 12.81 square miles [33.2 km²]. Of this total, a small amount of the area is covered by water (0.02 square miles [0.1 km²]).
Jefferson County has a land area of 1,111 square miles [2,878.2 km²]. At 12.79 square miles [33.1 km²], Mountain Brook has 1.15% 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: 33° 29' 29" (or 33.49°) [Map]
Lon: -86° 44' 4" (or -86.73°)
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 (20,413 people) and land area (12.79 square miles [33.1 km²]) values from the 2010 Census, Mountain Brook had a population density of 1,593 people per square mile [615 people/km²].
In comparison, the 2000 Census shows Mountain Brook had a population of 20,604 people and a land area of 12.24 square miles [31.7 km²]. This gives a population density of 1,683 people per square mile [650 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 Mountain Brook. You need to be careful when making such a comparison, the differences are likely to lead to an apple-to-oranges 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, Mountain Brook had 8,266 Housing Units<3> and with its population of 20,413 people, this averages 2.47 people per Housing Unit.
The 2010 Census shows Mountain Brook had a land area of 12.79 square miles [33.1 km²]. This translates to 645 Housing Units per square mile [249.1 housing units/km²].
From the Census of 2000: Mountain Brook had 8,268 Housing Units, a population of 20,604 people and a land area of 12.24 square miles [31.7 km²]. This gives a density of 2.49 people per Housing Unit and 675 Housing Units per square mile [260.9 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 Mountain Brook and you need to be careful when comparing results between the censuses. More information about the changes can be found in the section called Census-to-Census Observations ... (see below).
Jefferson County ...
The community of Mountain Brook is located in Jefferson County.
The county had a population of 658,466 people at the 2010 Census. With it's population of 20,413 people, Mountain Brook represented 3.1% of the county's total.
In addition, where the city of Mountain Brook has a population density of 1,593 people per square mile [615 people/km²], Jefferson County averages 592 people per square mile [228.8 people/km²].
For more information, please visit our Census Page for Jefferson County.
Population Rings for Mountain Brook ...
To help identify the number of people who live in Mountain Brook and the surrounding area, we have drawn concentric rings centered on Mountain Brook. We counted the number of communities within each ring and summed their populations.<4>
| Radius ||No of|
|5 mi [8 km]||5||305,407||+0.4%|
|10 mi [16 km]||12||436,199||+1.16%|
|15 mi [24 km]||27||576,076||+1.77%|
|20 mi [32 km]||36||644,062||+2.02%|
|25 mi [40 km]||48||680,709||+2.31%|
|30 mi [48 km]||59||713,649||+2.54%|
Census-to-Census Observations ...
When the Census Bureau takes a census count (or enumeration) for Mountain Brook, 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 Mountain Brook. 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 4.68% larger than the 2000 Census.
The 2010 Census shows that the total area for Mountain Brook was 12.81 square miles [33.2 km²]. Of this total, only a minor amount of the area is covered by water.
The 2000 Census shows a total area of 12.24 square miles [31.7 km²]. Of this total, only a minor amount of the area is covered by water.
While generally coinciding with the GPS location (latitude/longitude) of Mountain Brook, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Mountain Brook.
For the 2010 Census, the location was given as:
Lat: 33.491488° (or 33°29'29" N) [Map]
Lon: -86.734470° (or -86°44'4" W)
For the 2000 Census, the location given was:
Lat: 33.486972° (or 33°29'13" N) [Map]
Lon: -86.740465° (or -86°44'25" W)
The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 2,456 feet 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 (#2404329) to Mountain Brook. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Mountain Brook. The GNIS point has been mapped to the latitude/longitude:
Lat: 33.487028° (or 33°29'13" N) [Map]
Lon: -86.740192° (or -86°44'24" W)
The GSP location given for the 2010 Census lies 2,381 feet to the northeast<6> of the point given by the GNIS for Mountain Brook. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Mountain Brook.
Miscellaneous Information for Mountain Brook ...
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 Jefferson County or the city of Mountain Brook:
The GNIS Codes ...
The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Mountain Brook:
GNIS ID for Mountain Brook: 2404329
GNIS ID for Jefferson County: 161562
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: 073 (Jefferson County)
Place Code: 51696 (Mountain Brook)
State & County Code: 01/073 (Alabama / Jefferson County)
State & Place Code: 01/51696 (Alabama / Mountain Brook)
Misc. Census Codes ...
Mountain Brook is located in Census Region #3 (the South Region) and Division #6 (the East South-Central Division).
For more information about the various Federal identification codes, please visit our Misc Page for Mountain Brook.
|<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 312 degrees.|
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|<6>||The calculated bearing (or the angle) to the GNIS point is 313 degrees.|
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For additional information, please visit our Glossary for Mountain Brook.