Editing Loudoun County, Virginia (section)

==Geography==
{{Location map+ | Massies Corner to Mount Airy
| caption = Map of Loudoun County in [[Virginia]]
| width= 400
| places =

  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Harpers Ferry National Historical Park|Harpers{{nbsp}}Ferry{{nbsp}}National{{nbsp}}Historical{{nbsp}}Park]]
    | label_size=100
    | marksize=5
    | position =bottom
    | lat_deg =39.322778
    | lon_deg =-77.729722
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Montgomery County, Maryland|Montgomery]]
    | label_size=100
    | marksize=0
    | position =left
    | lat_deg =38.98
    | lon_deg =-77.15
| outside  = 1 <!-- Turn off error category due to location outside map-->
    }}
 {{Location map~ | Massies Corner to Mount Airy
    | label =[[Arlington County, Virginia|Arlington]]
    | label_size=100
    | marksize=0
    | position =left
    | lat_deg =38.87
    | lon_deg =-77.15
| outside  = 1 <!-- Turn off error category due to location outside map-->
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Fairfax, Virginia|Fairfax]]
    | label_size=100
    | marksize=5
    | position =left
    | lat_deg =38.87
    | lon_deg =-77.304377
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Washington County, Maryland|Washington]]
    | label_size=100
    | marksize=0
    | position =top
    | lat_deg =39.34
    | lon_deg =-77.723342
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Frederick County, Maryland|Frederick]]
    | label_size=100
    | marksize=0
    | position =right
    | lat_deg =39.34
    | lon_deg =-77.548994
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Jefferson County, West Virginia|Jefferson]]
    | label_size=100
    | marksize=0
    | position =left
    | lat_deg =39.31
    | lon_deg =-77.86
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Clarke County, Virginia|Clarke]]
    | label_size=100
    | marksize=0
    | position =right
    | lat_deg =39.05
    | lon_deg =-78
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Fauquier County, Virginia|Fauquier]]
    | label_size=100
    | marksize=0
    | position =left
    | lat_deg =38.74
    | lon_deg =-77.81
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Fairfax County, Virginia|Fairfax{{nbsp}}County]]
    | label_size=100
    | marksize=0
    | position =left
    | lat_deg =38.8
    | lon_deg =-77.4
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =Loudoun
    | label_size=100
    | marksize=0
    | position =top
    | lat_deg =39.2
    | lon_deg =-77.6
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Manassas, Virginia|Manassas]]
    | label_size=100
    | marksize=5
    | position =right
    | lat_deg =38.751415
    | lon_deg =-77.47
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Manassas Park, Virginia|Manassas{{nbsp}}Park]]
    | label_size=100
    | marksize=5
    | position =left
    | lat_deg =38.773564
    | lon_deg =-77.46
    }}
  {{Location map~ | Massies Corner to Mount Airy
    | label =[[Prince William County, Virginia|Prince{{nbsp}}William]]
    | label_size=100
    | marksize=0
    | position =left
    | lat_deg =38.7
    | lon_deg =-77.48
    }}
}}

According to the [[United States Census Bureau|U.S. Census Bureau]], Loudoun County has a total area of {{convert|521|sqmi|km2}}, of which {{convert|516|sqmi|km2}} is land and {{convert|6|sqmi|km2}} (1.1%) is water.<ref name="GR1">{{cite web |url=https://www.census.gov/geographies/reference-files/time-series/geo/gazetteer-files.html |publisher=[[United States Census Bureau]] |access-date=April 23, 2011 |date=February 12, 2011 |title=US Gazetteer files: 2010, 2000, and 1990}}</ref> It is bounded on the north by the [[Potomac River]]; across the river are [[Frederick County, Maryland|Frederick]], [[Washington County, Maryland|Washington]] and [[Montgomery County, Maryland|Montgomery]] counties in Maryland; it is bounded on the south by [[Prince William County, Virginia|Prince William]] and [[Fauquier County, Virginia|Fauquier]] counties, on the west by the watershed of the [[Blue Ridge Mountain]] across which are [[Jefferson County, West Virginia|Jefferson County]], [[West Virginia]] and [[Clarke County, Virginia|Clarke]] County, and on the east by [[Fairfax County, Virginia|Fairfax]] County. The [[Bull Run Mountains]] and [[Catoctin Mountain]] bisect the county. To the west of the range is the [[Loudoun Valley]]. Bisecting the Loudoun Valley from [[Hillsboro, Loudoun County, Virginia|Hillsboro]] to the [[Potomac River]] is [[Short Hill Mountain]].

===Adjacent counties===
{|
|- style="vertical-align:top;"
|
* [[Fairfax County, Virginia|Fairfax County]] (east)
* [[Prince William County, Virginia|Prince William County]] (southeast)
* [[Fauquier County, Virginia|Fauquier County]] (south)
* [[Jefferson County, West Virginia]] (west)
|
* [[Clarke County, Virginia|Clarke County]] (west)
* [[Washington County, Maryland]] (northwest)
* [[Frederick County, Maryland]] (north)
* [[Montgomery County, Maryland]] (east)
|}

===National protected area===
* [[Harpers Ferry National Historical Park]]