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Jefferson County, Virginia has existed twice in the U.S. state of Virginia's history. Formed in 1780, and 1801, respectively, both counties were named for one of that state's most celebrated residents, Thomas Jefferson, and each was separated from Virginia due to the creation of a new state, partitioned in accordance with Article IV, Section 3, Clause 1 of the United States Constitution. The two counties continued in existence as:

See also