| Rockville to Popovo | 5,003.59 mi (8,052.49 km) |
| Rockville to Provadia | 5,058.27 mi (8,140.50 km) |
| Rockville to Radnevo | 5,035.88 mi (8,104.47 km) |
| Rockville to Radomir | 4,903.82 mi (7,891.94 km) |
| Rockville to Rakitovo | 4,973.70 mi (8,004.39 km) |
| Rockville to Rakovski | 4,997.10 mi (8,042.06 km) |
| Rockville to Razgrad | 5,007.10 mi (8,058.15 km) |
| Rockville to Razlog | 4,952.40 mi (7,970.12 km) |
| Rockville to Ruse | 4,972.60 mi (8,002.63 km) |
| Rockville to Samokov | 4,937.41 mi (7,946.00 km) |
| Rockville to Sandanski | 4,957.71 mi (7,978.67 km) |
| Rockville to Sevlievo | 4,972.33 mi (8,002.20 km) |
| Rockville to Shumen | 5,034.21 mi (8,101.78 km) |
| Rockville to Silistra | 5,011.62 mi (8,065.42 km) |
| Rockville to Sliven | 5,035.77 mi (8,104.28 km) |
