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Loudoun County

Loudoun County Boundary

More Metadata Loudoun County was founded in 1757. Loudoun's boundary with Maryland is the mean low water mark of the Potomac River on the Virginia side; it has not been surveyed. Loudoun's boundary with Prince William…

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Updated Oct 10, 2026

Prototype by Datopian · not an official government website · data from data.virginia.gov