County Seat: Leesburg
Year Organized: 1757
Square Miles: 520
One Harrison Street, SE
Loudoun is named for John Campbell, 4th Earl of Loudoun, a colonial governor of Virginia.
County QuickFacts: Census Bureau Quick Facts
Loudoun County, Virginia formed from Fairfax County. Later changes occurred from 1823-1824. [Virginia Counties: Those Resulting from Virginia Legislation, by Morgan Poitiaux Robinson, originally published as Bulletin of the Virginia State Library, Volume 9, January, April, July 1916, reprinted 1992 by Genealogical Publishing Co., Inc., Baltimore, MD.]
Loudoun County was named for John Campbell, fourth earl of Loudoun, who was commander of British forces in North America during the early portion of the French and Indian War and governor of Virginia from 1756 to 1759. It was formed from Fairfax County in 1757. Its area is 512 square miles, and the county seat is Leesburg.
According to the US Census Bureau, Loudoun County has a total area of 521 square miles (1,350 km2), of which,
520 square miles (1,346 km2) of it is land and 1 square miles (3 km2) of it (0.24%) is water. It is bounded on the
North by the Potomac River; across the river are Frederick and Montgomery Counties in Maryland; it is bounded on the
south by Prince William and Fauquier Counties, on the west by watershed of the Blue Ridge Mountains across which are
Jefferson County, West Virginia and Clarke County, and on the east by 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 to the Potomac River is Short Hill Mountain.
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