| Rockville to Devnya | 5,062.11 mi (8,146.68 km) |
| Rockville to Dimitrovgrad | 5,032.92 mi (8,099.70 km) |
| Rockville to Dobrich | 5,057.57 mi (8,139.38 km) |
| Rockville to Dospat | 4,990.95 mi (8,032.16 km) |
| Rockville to Dupnitsa | 4,922.38 mi (7,921.80 km) |
| Rockville to Elhovo | 5,067.11 mi (8,154.72 km) |
| Rockville to Etropole | 4,935.21 mi (7,942.45 km) |
| Rockville to Gabrovo | 4,987.83 mi (8,027.14 km) |
| Rockville to Gorna Oryahovitsa | 4,991.40 mi (8,032.89 km) |
| Rockville to Gotse Delchev | 4,976.48 mi (8,008.88 km) |
| Rockville to Harmanli | 5,050.04 mi (8,127.26 km) |
| Rockville to Haskovo | 5,036.49 mi (8,105.44 km) |
| Rockville to Ihtiman | 4,944.00 mi (7,956.60 km) |
| Rockville to Isperih | 5,011.85 mi (8,065.79 km) |
| Rockville to Kardzhali | 5,040.26 mi (8,111.52 km) |
