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A Gazetteer for the United States and Canada

Union, Alabama
(Greene County)

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 The location of Union 

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Census Data for Union ...

Population ...

The most recent Census Estimate<1> was for 2015 and it gives Union a population of 223 people.

The last Decennial Census<2> was in 2010, giving Union a population of 237 people.

The town of Union is located in Greene County. The 2010 Census gave Greene County a population of 9,045 people. This means that Union had 2.62% of the county's total population, making it Greene's 4th most populous community.

At the same time, Alabama had a population of 4,779,736 people.

Area ...

When the Census Bureau conducts a census for a town like Union, 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 Union reflect the sampling area. Since the shape of the sampling area and the actual boundaries of&$160;Union 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 Union has a total area of 0.82 square miles [2.1 km²].

Greene County has a land area of 647 square miles [1,676 km²]. At 0.82 square miles [2.1 km²], Union has 0.13% 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° 59' 38"   (or 32.99°)

Lon:   -87° 54' 19"   (or -87.91°)

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 (237 people) and land area (0.82 square miles [2.1 km²]) values from the 2010 Census, Union had a population density of 288.7 people per square mile [111.5 people/km²].

In comparison, the 2000 Census shows Union had a population of 227 people and a land area of 0.82 square miles [2.1 km²]. This gives a population density of 276.8 people per square mile [106.9 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 Union. 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 differences can be found in the section Census-to-Census Observations ... (see below).

Housing Units ...

At the time of the 2010 Census, Union had 121 Housing Units<3> and with its population of 237 people, this averages 1.96 people per Housing Unit.

The 2010 Census shows Union had a land area of 0.82 square miles [2.1 km²]. This translates to 147.4 Housing Units per square mile [56.9 housing units/km²].

From the Census of 2000: Union had 103 Housing Units, a population of 227 people and a land area of 0.82 square miles [2.1 km²]. This gives a density of 2.2 people per Housing Unit and 125.6 Housing Units per square mile [48.49 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 Union and you need to be careful when comparing between the censuses. More information about these differences can be found in the section called Census-to-Census Observations ... (see below).

Greene County ...

The community of Union is located in Greene County.

The county had a population of 9,045 people at the 2010 Census. With it's population of 237 people, Union represented 2.62% of the county's total.

In addition, where the town of Union has a population density of 288.7 people per square mile [111.5 people/km²], Greene County averages 13.98 people per square mile [5.4 people/km²].

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

Population Rings for Union ...

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

RadiusNo of
Since 2010
5 mi [8 km]1223-5.91%
10 mi [16 km]22,989-5.74%
15 mi [24 km]33,326-5.7%
20 mi [32 km]88,683-3.37%
25 mi [40 km]1638,081+2.63%
30 mi [48 km]21141,063+6.52%

US Census QuickFacts ...

The Census Bureau has created documents containing demographic information called QuickFacts. Unfortunately, the Census Bureau has not created a QuickFact that is specific to Union.

A Census QuickFact is available for Greene County (QF-01063).

Below are QuickFacts for the counties that border Greene County.

2015 Est.
Since 2010
HaleQF-0106515,068-4.39%   E  
MarengoQF-0109120,028-4.75%   S  
PickensQF-0110720,864+5.66%   N  
SumterQF-0111913,103-4.8%   SW  
TuscaloosaQF-01125203,976+4.79%   NE  

Census-to-Census Observations ...

Introduction ...

When the Census Bureau takes a census count (or enumeration) for Union, 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 Union. 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 Union was 0.82 square miles [2.1 km²]. Of this total, only a minor amount of the area is covered by water.

The 2000 Census shows a total area of 0.82 square miles [2.1 km²]. Of this total, only a minor amount of the area is covered by water.

Location ...

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

For the 2010 Census, the location was given as:

Lat:   32.993810°   (or 32°59'37" N)

Lon:   -87.907179°   (or -87°54'25" W)

For the 2000 Census, the location given was:

Lat:   32.994164°   (or 32°59'38" N)

Lon:   -87.905313°   (or -87°54'19" W)

The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 585 feet 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 (#2406776) to Union. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Union. The GNIS point has been mapped to the latitude/longitude:

Lat:   32.993810°   (or 32°59'37" N)

Lon:   -87.907178°   (or -87°54'25" W)

The GSP location given for the 2010 Census lies 0.79 feet to the south<6> of the point given by the GNIS for Union. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Union.

Miscellaneous Information for Union ...

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 Greene County or the town of Union:

The GNIS Codes ...

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

GNIS ID for Union: 2406776

GNIS ID for Greene County: 161557

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: 063 (Greene County)

Place Code: 77616 (Union)

State & County Code: 01/063 (Alabama / Greene County)

State & Place Code: 01/77616 (Alabama / Union)

Misc. Census Codes ...

Union 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 Union.

Other Roadside Stops ...

Find a Community located in Alabama

About Greene 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 Union. If you can help, please contact us through our Feedback Page.

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 102 degrees.

- Return to Citation

<6>The calculated bearing (or the angle) to the GNIS point is 157 degrees.

- Return to Citation

For additional information, please visit our Glossary for Union.


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This page was last modified: 23 Dec 2016
By John Hall