Geography is based on weather maps used by local TV stations.
| COUNTY | 2010 CENSUS | PRIMARY CITIES |
| Sullivan County, TN | 156,823 | Kingsport, Bristol |
| Washington County, TN | 122,979 | Johnson City |
| Greene County, TN | 68,831 | Greeneville |
| Pike County, KY | 65,074 | Pikeville |
| Carter County, TN | 57,424 | Elizabethton |
| Hawkins County, TN | 56,833 | Church Hill, Mount Carmel, Rogersville |
| Washington County, VA | 54,876 | Abingdon |
| Watauga County, NC | 51,709 | Boone, Banner Elk, Beech Mountain |
| Tazewell County, VA | 45,078 | Tazewell, Bluefield, Richlands |
| Wise County, VA | 41,452 | Wise, Big Stone Gap, Pound, Coeburn, St. Paul |
| Cocke County, TN | 35,662 | Newport |
| Smyth County, VA | 32,208 | Marion, Chilhowie |
| Harlan County, KY | 29,278 | Harlan, Cumberland |
| Russell County, VA | 28,897 | Lebanon, Castlewood |
| Bell County, KY | 28,691 | Middlesboro, Pineville |
| Ashe County, NC | 27,281 | Jefferson, West Jefferson |
| Lee County, VA | 25,587 | Jonesville, Pennington Gap |
| Letcher County, KY | 24,519 | Whitesburg, Jenkins |
| Buchanan County, VA | 24,098 | Grundy |
| Scott County, VA | 23,177 | Gate City, Duffield |
| Unicoi County, TN | 18,313 | Erwin |
| Johnson County, TN | 18,244 | Mountain City |
| Bristol city, VA | 17,835 | |
| Yancey County, NC | 17,818 | Burnsville |
| Avery County, NC | 17,797 | Newland |
| Dickenson County, VA | 15,903 | Clintwood |
| Mitchell County, NC | 15,579 | Bakersville, Spruce Pine |
| Grayson County, VA | 15,533 | Fries, Independence |
| Leslie County, KY | 11,310 | Hyden |
| Galax city, VA | 7,042 | |
| Hancock County, TN | 6,819 | Sneedville |
| Norton city, VA | 3,958 | |
| 1,166,628 |
