Census Data for Aurora
Population ...
The most recent Census Estimate<1> was for 2019 and it gave Aurora a population of 385,623 people.
The last Decennial Census<2> was in 2010, which gave Aurora a population of 325,078 people.
The city of Aurora is located in Arapahoe County. The 2010 Census gave Arapahoe County; a population of 574,747 people. This means that Aurora had 56.6% of the county's total population, making it Arapahoe's most populous community.
At the same time, Colorado had a population of 5,029,196 people, meaning that Aurora had 6.46% of the total population of Colorado - making it the state's 3rd most populous community.
Area ...
The 2010 Census shows that the sampling area for Aurora has a total area of 155.4 square miles [402.6 km²]. Of this total, a small amount of the area is covered by water (0.7 square miles [1.8 km²]).
Arapahoe County has a land area of 798 square miles [2,067.1 km²]. At 154.7 square miles [400.8 km²], Aurora has 19.39% of the county's total land area.
- Continue Reading ...
- When the Census Bureau conducts a census for a city like Aurora, they draw a boundary around the area in which they are going to conduct their count - this defines the sampling area (usually 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 population, area and housing for Aurora reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Aurora might be different, it's best to check with the U.S. Census Bureau to resolve any difference between the two.
- 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: 39° 41' 16" (or 39.69°)
- Lon: -104° 41' 23" (or -104.69°)
- 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).
Housing Units ...
At the time of the 2010 Census, Aurora had 131,040 Housing Units<3> and with its population of 325,078 people, this averages 2.48 people per Housing Unit.
- Continue Reading ...
- The 2010 Census shows Aurora had a land area of 154.7 square miles [400.8 km²]. This translates to 843 Housing Units per square mile [325.5 housing units/km²].
- From the Census of 2000: Aurora had 109,260 Housing Units, a population of 276,393 people and a land area of 142.5 square miles [369.1 km²]. This gives a density of 2.53 people per Housing Unit and 765 Housing Units per square mile [295.5 housing units/km²].
- Note: Repeating the caution above (under Population Density), be aware that when comparing Housing Units between the 2010 and the 2000 Census, there were changes in the sampling area for Aurora 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).
Arapahoe County ...
The city of Aurora is primarily located in Arapahoe County<4>. A portion of Aurora extends into Adams County and Douglas County.
The county had a population of 574,747 people at the 2010 Census. With it's population of 325,078 people, Aurora represented 56.6% of the county's total.
In addition, where the city of Aurora has a population density of 2,091 people per square mile [807 people/km²], Arapahoe County averages 720 people per square mile [278 people/km²].
For more information, please visit our Census Page for Arapahoe County.
Census-to-Census Observations ...
Introduction ...
When the Census Bureau takes a census count (or enumeration) for Aurora, 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 Aurora. It's important to note that from one Census to the next, the shape and location of the polygon can change.
- Continue Reading ...
- Although we don't have specific information about the shape of the polygon for Aurora or how it changed has over time, there is some information that can give us some hints. For example, since the shape of the sampling area is directly related to the shape of the polygon, any change to area probably indicates a new shape for the polygon.
- If you need precision or details about the methodology of the Census, you should visit the U.S. Census Bureau for a definitive answer.
Location ...
While generally coinciding with the GPS location (latitude/longitude) of Aurora, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Aurora.
- Continue Reading ...
- For the 2010 Census, the location was given as:
- Lat: 39.688002° (or 39°41'16" N)
- Lon: -104.689740° (or -104°41'23" W)
- For the 2000 Census, the location given was:
- Lat: 39.695887° (or 39°41'45" N)
- Lon: -104.808101° (or -104°48'29" W)
- The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 6 miles to the east<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 (#2409757) to Aurora. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Aurora. The GNIS point has been mapped to the latitude/longitude:
- Lat: 39.688835° (or 39°41'19" N)
- Lon: -104.686830° (or -104°41'12" W)
- The GPS location given for the 2010 Census lies 871 feet to the west<6> of the point given by the GNIS for Aurora. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Aurora.
Miscellaneous Information for Aurora ...
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 Arapahoe County or the city of Aurora:
- The GNIS Codes ...
- The FIPS Codes ...
- An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):
- State Code: 08 (Colorado)
- County Code: 005 (Arapahoe County)
- Place Code: 04000 (Aurora)
- State & County Code: 08/005 (Colorado / Arapahoe County)
- State & Place Code: 08/04000 (Colorado / Aurora)
- Misc. Census Codes ...
- Aurora is located in Census Region #4 (the West Region) and Division #8 (the Mountain Division).
- The US Postal Service ZIP Code ...
- While some people have used ZIP codes to identify a community, the ZIP codes were actually created to make mail delivery more efficient by grouping addresses together. Although a ZIP Code doesn't specifically identify a city like Aurora, they do identify addresses that are in (or near) the city. It's important to remember that the boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes.
- Our list of ZIP codes for Aurora:<7>
- 80010, 80011, 80012, 80013, 80014, 80015, 80016, 80017, 80018, 80040, 80041, 80044, 80045, 80046 & 80047.
- 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 Aurora.
Off-the-Road Links ...
The official website for Aurora: www.auroragov.org; www.ci.aurora.co.us/
The official website for Arapahoe County: www.co.arapahoe.co.us/
The official website for State of Colorado: https://www.colorado.gov/
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)
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 2019. |
| <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. |
| <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). |
| <4> | If you're interested in how the shape of Colorado's counties, including Arapahoe, have changed over time, we recommend the Atlas of Historical County Boundaries. |
| <5> | The calculated bearing (or angle) to the 2010 Census location is 265 degrees and a distance of 6 miles. |
| <6> | The calculated bearing (or angle) to the GNIS point is 110 degrees and a distance of 871 feet. |
| <7> | When looking for a ZIP Code, whether Aurora or elsewhere, it's always best to check the website of the United States Postal Service (USPS). |