Carroll County is a county located in the southwestern part of the U.S. state of Virginia. As of the 2010 census, the population was 30,042. Its county seat is Hillsville.
It is the only county in Virginia with Piedmont Topography of roughly one fifth in the southeast part of the county and Mountain topography of roughly four fifths elsewhere of the county. The Blue Ridge escarpment usually defines the county lines in both North Carolina and Virginia. The CDP community of Cana is in the Virginia Piedmont while the rest of the county is in the Appalachian Mountains.