Buchanan County, Virginia is located in the Cumberland Plateau Health District. It has 502.9 square miles of land area and is the 24th largest county in Virginia by total area. It is bordered by Dickenson, Tazewell, and Russell Counties in Virginia, McDowell and Mingo County, West Virginia, and Pike County, Kentucky. There are 7 census tracts in the county. The county FIPS number is 51027.

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