There are 14 US Post Offices in Buchanan County serving a total of 21,141 residents equating to 1,510 residents per post office. It's estimated that approximately 33,743 packages are handled across the 14 county post offices annually. Buchanan County is a United States county located on the western border near the far western end of the Commonwealth of Virginia. The county is part of the Southwest Virginia region and lies in the Ridge-and-Valley portion of the Appalachian Mountains. Its county seat is Grundy. Buchanan County was established in 1858 from parts of Russell and Tazewell counties, and it was named in honor of former President James Buchanan. In 1880, part of Buchanan County was taken to form Dickenson County. As of the 2010 census, the county population was 24,098, and had a double digit percentage population decrease over the last three censuses. In addition, as of 2012, Buchanan was the fifth poorest county in Virginia, when ranked by median household income."