| Potomac to Popovo | 5,008.35 mi (8,060.16 km) |
| Potomac to Provadia | 5,063.05 mi (8,148.19 km) |
| Potomac to Radnevo | 5,040.61 mi (8,112.07 km) |
| Potomac to Radomir | 4,908.50 mi (7,899.47 km) |
| Potomac to Rakitovo | 4,978.38 mi (8,011.92 km) |
| Potomac to Rakovski | 5,001.81 mi (8,049.64 km) |
| Potomac to Razgrad | 5,011.87 mi (8,065.83 km) |
| Potomac to Razlog | 4,957.06 mi (7,977.62 km) |
| Potomac to Ruse | 4,977.37 mi (8,010.31 km) |
| Potomac to Samokov | 4,942.09 mi (7,953.53 km) |
| Potomac to Sandanski | 4,962.36 mi (7,986.15 km) |
| Potomac to Sevlievo | 4,977.07 mi (8,009.81 km) |
| Potomac to Shumen | 5,038.99 mi (8,109.46 km) |
| Potomac to Silistra | 5,016.43 mi (8,073.16 km) |
| Potomac to Sliven | 5,040.51 mi (8,111.92 km) |
