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Trinity, Alabama
(Morgan County)

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Census Data for Trinity ...

Population ...

The most recent Census Estimate<1> was for 2015 and it gives Trinity a population of 2,157 people.

The last Decennial Census<2> was in 2010, giving Trinity a population of 2,095 people.

The town of Trinity is located in Morgan County. The 2010 Census gave Morgan County a population of 119,490 people. This means that Trinity had 1.75% of the county's total population, making it Morgan's 4th most populous community.

At the same time, Alabama had a population of 4,779,736 people, meaning that Trinity had 0.04% of the total population of Alabama - making it the state's 171st most populous community.

Area ...

When the Census Bureau conducts a census for a town like Trinity, 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 Trinity reflect the sampling area. Since the shape of the sampling area and the actual boundaries of&$160;Trinity 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 Trinity has a total area of 4.42 square miles [11.4 km²]. Of this total, a small amount of the area is covered by water (0 square miles [0 km²]).

Morgan County has a land area of 579 square miles [1,500.5 km²]. At 4.41 square miles [11.4 km²], Trinity has 0.76% 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:   34° 36' 13"   (or 34.6°)

Lon:   -87° 5' 10"   (or -87.09°)

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 (2,095 people) and land area (4.41 square miles [11.4 km²]) values from the 2010 Census, Trinity had a population density of 474.4 people per square mile [183.2 people/km²].

In comparison, the 2000 Census shows Trinity had a population of 1,841 people and a land area of 3.62 square miles [9.4 km²]. This gives a population density of 508 people per square mile [196.3 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 Trinity. You need to be careful when making such a comparison, the differences are likely to lead to an incorrect 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, Trinity had 823 Housing Units<3> and with its population of 2,095 people, this averages 2.55 people per Housing Unit.

The 2010 Census shows Trinity had a land area of 4.41 square miles [11.4 km²]. This translates to 186.4 Housing Units per square mile [72 housing units/km²].

From the Census of 2000: Trinity had 728 Housing Units, a population of 1,841 people and a land area of 3.62 square miles [9.4 km²]. This gives a density of 2.53 people per Housing Unit and 201.1 Housing Units per square mile [77.6 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 Trinity 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).

Morgan County ...

The community of Trinity is located in Morgan County.

The county had a population of 119,490 people at the 2010 Census. With it's population of 2,095 people, Trinity represented 1.75% of the county's total.

In addition, where the town of Trinity has a population density of 474.4 people per square mile [183.2 people/km²], Morgan County averages 206.3 people per square mile [79.6 people/km²].

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

Population Rings for Trinity ...

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

RadiusNo of
Since 2010
5 mi [8 km]257,594-0.32%
10 mi [16 km]358,113-0.37%
15 mi [24 km]10105,355+3.39%
20 mi [32 km]16157,122+4.96%
25 mi [40 km]18157,866+4.95%
30 mi [48 km]28354,945+5.32%

US Census QuickFacts ...

The Census Bureau has created documents containing demographic information called QuickFacts. Although they haven't created a QuickFact for Trinity, there are QuickFacts available for the following nearby communities:

2015 Est.
Since 2010
DecaturQF-012010455,437-0.44%   E  
HartselleQF-013344814,493+1.67%   SE  
AthensQF-010295624,966+14.02%   NE  
MadisonQF-014578446,962+9.37%   E  
HuntsvilleQF-0137000190,582+5.82%   E  

For more about neighboring communities, please visit our Nearby Page for Trinity. For an expanded list of the communities that are closest to Trinity, see our County-by-County Page for Trinity.

A Census QuickFact is available for Morgan County (QF-01103).

Below are QuickFacts for the counties that border Morgan County.

2015 Est.
Since 2010
CullmanQF-0104382,005+1.99%   S  
LawrenceQF-0107933,115-3.56%   W  
LimestoneQF-0108391,663+10.73%   N  
MadisonQF-01089353,089+5.46%   NE  
MarshallQF-0109594,725+1.83%   E  
WinstonQF-0113323,877-2.48%   SW  

Census-to-Census Observations ...

Introduction ...

When the Census Bureau takes a census count (or enumeration) for Trinity, 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 Trinity. 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 21.98% larger than the 2000 Census.

The 2010 Census shows that the total area for Trinity was 4.42 square miles [11.4 km²]. Of this total, only a minor amount of the area is covered by water.

The 2000 Census shows a total area of 3.62 square miles [9.4 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 Trinity, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Trinity.

For the 2010 Census, the location was given as:

Lat:   34.597263°   (or 34°35'50" N)

Lon:   -87.083806°   (or -87°5'1" W)

For the 2000 Census, the location given was:

Lat:   34.603808°   (or 34°36'13" N)

Lon:   -87.086137°   (or -87°5'10" W)

The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 2,486 feet to the south<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 (#2406755) to Trinity. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Trinity. The GNIS point has been mapped to the latitude/longitude:

Lat:   34.600644°   (or 34°36'2" N)

Lon:   -87.084095°   (or -87°5'2" W)

The GSP location given for the 2010 Census lies 1,235 feet to the south<6> of the point given by the GNIS for Trinity. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Trinity.

Miscellaneous Information for Trinity ...

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 Morgan County or the town of Trinity:

The GNIS Codes ...

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

GNIS ID for Trinity: 2406755

GNIS ID for Morgan County: 161578

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: 103 (Morgan County)

Place Code: 76872 (Trinity)

State & County Code: 01/103 (Alabama / Morgan County)

State & Place Code: 01/76872 (Alabama / Trinity)

Misc. Census Codes ...

Trinity 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 Trinity, it does identify addresses that are in (or near) Trinity. 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 Trinity: 35673<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 Trinity.

Other Roadside Stops ...

Search for a Community in Alabama

About Morgan 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 Trinity. If you can help, please contact us through our Feedback Page.

The official website for Morgan County:

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 196 degrees.

- Return to Citation

<6>The calculated bearing (or the angle) to the GNIS point is 184 degrees.

- Return to Citation

<7>When looking for a ZIP Code, whether Trinity 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 Trinity.


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This page was last modified: 19 Oct 2016
By John Hall