Census Data for Herndon
Population ...
The most recent Census Estimate<1> was for 2019 and it gave Herndon a population of 24,709 people.
The last Decennial Census<2> was in 2010, which gave Herndon a population of 23,292 people.
The town of Herndon is located in Fairfax County. The 2010 Census gave Fairfax County; a population of 1,081,726 people. This means that Herndon had 2.15% of the county's total population, making it Fairfax's most populous community.
At the same time, Virginia had a population of 8,001,024 people, meaning that Herndon had 0.29% of the total population of Virginia - making it the state's 24th most populous community.
Area ...
The 2010 Census shows that the sampling area for Herndon has a total area of 4.28 square miles [11.1 km²]. Of this total, a small amount of the area is covered by water (0 square miles [0 km²]).
Fairfax County has a land area of 391 square miles [1,012.6 km²]. At 4.27 square miles [11.1 km²], Herndon has 1.09% of the county's total land area.
- Continue Reading ...
- When the Census Bureau conducts a census for a town like Herndon, 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 town.
- Things like population, area and housing for Herndon reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Herndon 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: 38° 58' 13" (or 38.97°)
- Lon: -77° 23' 13" (or -77.39°)
- 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, Herndon had 7,813 Housing Units<3> and with its population of 23,292 people, this averages 2.98 people per Housing Unit.
- Continue Reading ...
- The 2010 Census shows Herndon had a land area of 4.27 square miles [11.1 km²]. This translates to 1,825 Housing Units per square mile [704 housing units/km²].
- From the Census of 2000: Herndon had 7,190 Housing Units, a population of 21,655 people and a land area of 4.22 square miles [10.9 km²]. This gives a density of 3.01 people per Housing Unit and 1,703 Housing Units per square mile [657 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 Herndon and you need to be careful when comparing values between the censuses. More information about the nature of these the changes can be found in the section called Census-to-Census Observations ... (see below).
Fairfax County ...
The community of Herndon is located in Fairfax County<4>.
The county had a population of 1,081,726 people at the 2010 Census. With it's population of 23,292 people, Herndon represented 2.15% of the county's total.
In addition, where the town of Herndon has a population density of 5,442 people per square mile [2,101 people/km²], Fairfax County averages 2,766 people per square mile [1,068 people/km²].
For more information, please visit our Census Page for Fairfax County.
Census-to-Census Observations ...
Introduction ...
When the Census Bureau takes a census count (or enumeration) for Herndon, 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 Herndon. 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 Herndon 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 Herndon, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Herndon.
- Continue Reading ...
- For the 2010 Census, the location was given as:
- Lat: 38.970411° (or 38°58'13" N)
- Lon: -77.387108° (or -77°23'13" W)
- For the 2000 Census, the location given was:
- Lat: 38.971478° (or 38°58'17" N)
- Lon: -77.388675° (or -77°23'19" W)
- The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 590 feet to the southeast<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 (#2390244) to Herndon. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Herndon. The GNIS point has been mapped to the latitude/longitude:
- Lat: 38.969912° (or 38°58'11" N)
- Lon: -77.386764° (or -77°23'12" W)
- The GPS location given for the 2010 Census lies 206.4 feet to the northwest<6> of the point given by the GNIS for Herndon. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Herndon.
Miscellaneous Information for Herndon ...
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 Fairfax County or the town of Herndon:
- The GNIS Codes ...
- The FIPS Codes ...
- An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):
- State Code: 51 (Virginia)
- County Code: 059 (Fairfax County)
- Place Code: 36648 (Herndon)
- State & County Code: 51/059 (Virginia / Fairfax County)
- State & Place Code: 51/36648 (Virginia / Herndon)
- Misc. Census Codes ...
- Herndon is located in Census Region #3 (the South Region) and Division #5 (the South Atlantic Division).
For more information about the various Federal identification codes, please visit our Misc Page for Herndon.
Off-the-Road Links ...
The official website for Herndon: www.town.herndon.va.us/
The official website for Fairfax County: www.co.fairfax.va.us/
The official website for State of Virginia: https://www.virginia.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 Virginia's counties, including Fairfax, have changed over time, we recommend the Atlas of Historical County Boundaries. |
| <5> | The calculated bearing (or angle) to the 2010 Census location is 228 degrees and a distance of 590 feet. |
| <6> | The calculated bearing (or angle) to the GNIS point is 28 degrees and a distance of 206.4 feet. |