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The 2000 Census showed that Loudoun County had a population of 169,599 people. This represented 2.4% of the total population of Virginia, making it the state's 6th most populous county (out of 134 counties).

From the Census Estimates for 2009<1>, Loudoun had a population of 301,171 people. This is an increase of 77.58% since the 2000 Census.

The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.

Since 2000
Year-to-Year Change
2010312,311+84.15%+3.7% since 2009
2009301,171+77.58%+3.81% since 2008
2008290,121+71.06%+4.56% since 2007
2007277,459+63.6%+4.61% since 2006
2006265,240+56.39%+4.7% since 2005
2005253,332+49.37%+6.82% since 2004
2004237,162+39.84%+8.01% since 2003
2003219,577+29.47%+8.1% since 2002
2002203,122+19.77%+7.07% since 2001
2001189,717+11.86%+11.86% since 2000
2000169,599The Last Census

Loudoun County had 62,160 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Loudoun County has a total area<3> of 521 square miles [1,349 km²]. Of this total, only a minor amount of that area is covered by water (1.25 square miles [3.24 km²]).

Using the above population and land area values, Loudoun County had a population density of 326.2 people per square mile [126 people/km²], making it the state's 10th most densely populated county (out of 134 counties).

US Census QuickFacts

The Census Bureau has created documents containing demographic information that are called QuickFacts. A QuickFact that is specific to Loudoun County is available. The QuickFact also contains a comparison between Loudoun and the state of Virginia.

Click here for the Loudoun County QuickFact (QF-51107).

Below are some of the communities that are located in Loudoun County:

(2009 Est)
(2000 Census)
Change in

Below are the counties that adjoin and form the boundaries of Loudoun County. A link to their specific Census QuickFact has been provided.

(2009 Est.)
(2000 Census)
Change in
Frederick (MD)QF-24021   N227,980195,27716.75%
Montgomery (MD)QF-24031   E971,600873,34111.25%
Washington (MD)QF-24043   N145,910131,92310.6%
ClarkeQF-51043   W14,58812,65215.3%
FairfaxQF-51059   SE1,037,605969,7497%
FauquierQF-51061   SW68,01055,13923.34%
Prince WilliamQF-51153   S379,166280,81335.02%
Jefferson (WV)QF-54037   NW52,75042,19025.03%

Other Roadside Stops ...

About Virginia

Visit our Community Index for Virginia

Off-the-Road Links ...

U.S. Census Bureau
Census QuickFact for Loudoun County

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

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<2>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).

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<3>The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Loudoun. The value given by the Census Bureau reflects their statistical (or sampling) requirements.

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<4>All Quarter-dollar coin images from the United States Mint.

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