| Clarksburg to Popovo | 5,001.44 mi (8,049.04 km) |
| Clarksburg to Provadia | 5,056.04 mi (8,136.92 km) |
| Clarksburg to Radnevo | 5,033.93 mi (8,101.34 km) |
| Clarksburg to Radomir | 4,902.11 mi (7,889.18 km) |
| Clarksburg to Rakitovo | 4,971.97 mi (8,001.62 km) |
| Clarksburg to Rakovski | 4,995.25 mi (8,039.08 km) |
| Clarksburg to Razgrad | 5,004.90 mi (8,054.61 km) |
| Clarksburg to Razlog | 4,950.75 mi (7,967.46 km) |
| Clarksburg to Ruse | 4,970.40 mi (7,999.09 km) |
| Clarksburg to Samokov | 4,935.68 mi (7,943.21 km) |
| Clarksburg to Sandanski | 4,956.13 mi (7,976.13 km) |
| Clarksburg to Sevlievo | 4,970.34 mi (7,999.00 km) |
| Clarksburg to Shumen | 5,032.01 mi (8,098.24 km) |
| Clarksburg to Silistra | 5,009.26 mi (8,061.62 km) |
| Clarksburg to Sliven | 5,033.72 mi (8,100.99 km) |
