A Gazetteer for the United States and Canada
Census Data for Erwin ...
The most recent Census Estimate<1> was for 2018 and it gave Erwin a population of 5,853 people.
The last Decennial Census<2> was in 2010, which gave Erwin a population of 6,097 people.
The town of Erwin is located in Unicoi County. The 2010 Census gave Unicoi County a population of 18,313 people. This means that Erwin had 33.29% of the county's total population, making it Unicoi's most populous community.
When the Census Bureau conducts a census for a town like Erwin, they draw a boundary around the area in which they are going to conduct their count - this defines the sampling area (usually shaped as 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 Erwin reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Erwin might be different, it's best to check with the U.S. Census Bureau to resolve any difference between the two.
The 2010 Census shows that the sampling area for Erwin has a total area of 4.04 square miles [10.5 km²]. Of this total, a small amount of the area is covered by water (0 square miles [0 km²]).
Unicoi County has a land area of 186.2 square miles [482.2 km²]. At 4.04 square miles [10.5 km²], Erwin has 2.17% 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 the center of the polygon, known as the centroid). At the time of the 2010 Census, the sampling area was located at:
Lat: 36° 8' 44" (or 36.15°) [Map]
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 (6,097 people) and land area (4.04 square miles [10.5 km²]) values from the 2010 Census, Erwin had a population density of 1,508 people per square mile [582 people/km²].
In comparison, the 2000 Census shows Erwin had a population of 5,610 people and a land area of 3.54 square miles [9.2 km²]. This gives a population density of 1,580 people per square mile [610 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 Erwin. 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 changes can be found in the section Census-to-Census Observations ... (see below).
Housing Units ...
At the time of the 2010 Census, Erwin had 2,909 Housing Units<3> and with its population of 6,097 people, this averages 2.1 people per Housing Unit.
The 2010 Census shows Erwin had a land area of 4.04 square miles [10.5 km²]. This translates to 719 Housing Units per square mile [277.9 housing units/km²].
From the Census of 2000: Erwin had 2,645 Housing Units, a population of 5,610 people and a land area of 3.54 square miles [9.2 km²]. This gives a density of 2.12 people per Housing Unit and 744 Housing Units per square mile [287.6 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 Erwin and you need to be careful when comparing results between the censuses. More information about these differences can be found in the section called Census-to-Census Observations ... (see below).
Unicoi County ...
The county had a population of 18,313 people at the 2010 Census. With it's population of 6,097 people, Erwin represented 33.29% of the county's total.
In addition, where the town of Erwin has a population density of 1,508 people per square mile [582 people/km²], Unicoi County averages 98.4 people per square mile [37.98 people/km²].
For more information, please visit our Census Page for Unicoi County.
Population Rings for Erwin ...
To help identify the number of people who live in Erwin and the surrounding area, we have drawn concentric rings centered on Erwin. We counted the number of communities within each ring and summed their populations.<4>
Census-to-Census Observations ...
When the Census Bureau takes a census count (or enumeration) for Erwin, 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 Erwin. 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 13.85% larger than the 2000 Census.
The 2010 Census shows that the total area for Erwin was 4.04 square miles [10.5 km²]. Of this total, only a minor amount of the area is covered by water.
The 2000 Census shows a total area of 3.55 square miles [9.2 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 Erwin, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Erwin.
For the 2010 Census, the location was given as:
Lat: 36.145833° (or 36°8'44" N) [Map]
For the 2000 Census, the location given was:
Lat: 36.145036° (or 36°8'42" N) [Map]
The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 457 feet to the northwest<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 (#2406459) to Erwin. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Erwin. The GNIS point has been mapped to the latitude/longitude:
Lat: 36.145471° (or 36°8'43" N) [Map]
The GSP location given for the 2010 Census lies 178.9 feet to the northwest<6> of the point given by the GNIS for Erwin. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Erwin.
Miscellaneous Information for Erwin ...
The Federal government has assigned various identifying codes to each community, county and state. At one time or another, the US Census Bureau has used one (or more) of the following identifiers when referring to either Unicoi County or the town of Erwin:
The GNIS Codes ...
The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Erwin:
GNIS ID for Erwin: 2406459
The FIPS Codes ...
An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):
State Code: 47 (Tennessee)
County Code: 171 (Unicoi County)
Place Code: 24360 (Erwin)
Misc. Census Codes ...
Erwin 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 Erwin.
Other Roadside Stops ...
Off-the-Road Links ...
The official website of the U.S. Census Bureau
Unfortunately, we don't know of a website for Erwin. If you can help, please contact us through our Feedback Page.
The official website for State of Tennessee: https://www.tn.gov/
The official website of the U.S. Board on Geographic Names (BGN)
The official website of the U.S. Geological Survey (USGS)
Please keep in mind that we can not guarantee the accuracy or timeliness of the information on this website, so use with care. We encourage you to double-check the information that is critical to you.
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This page was last modified: 09 Sep 2019